| rfc3868 Description: Request For Comments
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Network Working Group J. Loughney, Ed.
Request for Comments: 3868 Nokia
Category: Standards Track G. Sidebottom
Signatus Technologies
L. Coene
G. Verwimp
Siemens n.v.
J. Keller
Tekelec
B. Bidulock
OpenSS7 Corporation
October 2004
Signalling Connection Control Part User Adaptation Layer (SUA)
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
This document defines a protocol for the transport of any Signalling
Connection Control Part-User signalling over IP using the Stream
Control Transmission Protocol. The protocol is designed to be
modular and symmetric, to allow it to work in diverse architectures,
such as a Signalling Gateway to IP Signalling Endpoint architecture
as well as a peer-to-peer IP Signalling Endpoint architecture.
Loughney, et al. Standards Track [Page 1]
RFC 3868 SUA October 2004
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Abbreviations and Terminology. . . . . . . . . . . . . . 4
1.3. Signalling Transport Architecture. . . . . . . . . . . . 6
1.4. Services Provided by the SUA Layer . . . . . . . . . . . 9
1.5. Internal Functions Provided in the SUA Layer . . . . . . 11
1.6. Definition of SUA Boundaries . . . . . . . . . . . . . . 14
2. Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . 19
3. Protocol Elements. . . . . . . . . . . . . . . . . . . . . . . 19
3.1. Common Message Header. . . . . . . . . . . . . . . . . . 20
3.2. SUA Connectionless Messages. . . . . . . . . . . . . . . 24
3.3. Connection Oriented Messages . . . . . . . . . . . . . . 27
3.4. Signalling Network Management (SNM) Messages . . . . . . 42
3.5. Application Server Process State Maintenance Messages. . 49
3.6. ASP Traffic Maintenance Messages . . . . . . . . . . . . 53
3.7. SUA Management Messages. . . . . . . . . . . . . . . . . 56
3.8. Routing Key Management (RKM) Messages. . . . . . . . . . 58
3.9. Common Parameters. . . . . . . . . . . . . . . . . . . . 61
3.10. SUA-Specific parameters. . . . . . . . . . . . . . . . . 74
4. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 92
4.1. Procedures to Support the SUA-User Layer . . . . . . . . 92
4.2. Receipt of Primitives from the Layer Management. . . . . 93
4.3. AS and ASP State Maintenance . . . . . . . . . . . . . . 95
4.4. Routing Key Management Procedures. . . . . . . . . . . .109
4.5. Availability and/or Congestion Status of SS7
Destination Support101 . . . . . . . . . . . . . . . . .112
4.6. MTP3 Restart . . . . . . . . . . . . . . . . . . . . . .115
4.7. SCCP - SUA Interworking at the SG. . . . . . . . . . . .115
5. Examples of SUA Procedures . . . . . . . . . . . . . . . . . .117
5.1. SG Architecture. . . . . . . . . . . . . . . . . . . . .117
5.2 IPSP Examples. . . . . . . . . . . . . . . . . . . . . .119
6. Security Considerations. . . . . . . . . . . . . . . . . . . .121
7. IANA Considerations. . . . . . . . . . . . . . . . . . . . . .121
7.1. SCTP Payload Protocol ID . . . . . . . . . . . . . . . .121
7.2. Port Number. . . . . . . . . . . . . . . . . . . . . . .121
7.3. Protocol Extensions. . . . . . . . . . . . . . . . . . .121
8. Timer Values . . . . . . . . . . . . . . . . . . . . . . . . .123
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .123
10. References . . . . . . . . . . . . . . . . . . . . . . . . . .123
10.1. Normative References . . . . . . . . . . . . . . . . . .123
10.2. Informative References . . . . . . . . . . . . . . . . .124
Loughney, et al. Standards Track [Page 2]
RFC 3868 SUA October 2004
Appendix A. Signalling Network Architecture . . . . . . . . . . .125
A.1. Generalized Peer-to-Peer Network Architecture. . . . . .125
A.2. Signalling Gateway Network Architecture. . . . . . . . .126
A.3. Signalling Gateway Message Distribution
Recommendations. . . . . . . . . . . . . . . . . . . . .128
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .129
Full Copyright Statement . . . . . . . . . . . . . . . . . . . . .131
1. Introduction
There is ongoing integration of switched circuit networks and IP
networks. Network service providers are designing IP-based
signalling architectures that need support for SS7 and SS7-like
signalling protocols. IP provides an effective way to transport user
data and for operators to expand their networks and build new
services. In these networks, there is need for interworking between
the SS7 and IP domains [2719].
This document defines a protocol for the transport SS7 SCCP-User
protocols [ANSI SCCP] [ITU SCCP], such as TCAP and RANAP, over IP
using the Stream Control Transmission Protocol (SCTP) [2960].
1.1. Scope
This document details the delivery of SCCP-user messages (MAP & CAP
over TCAP [ANSI TCAP] [ITU TCAP], RANAP [RANAP], etc.) messages over
IP between two signalling endpoints. Consideration is given for the
transport from a signalling gateway to an IP signalling node (such as
an IP-resident Database) as described in the Framework Architecture
for Signalling Transport [2719]. This protocol can also support
transport of SCCP-user messages between two endpoints wholly
contained within an IP network.
The delivery mechanism addresses the following criteria:
* Support for transfer of SCCP-User Part messages
* Support for SCCP connectionless service.
* Support for SCCP connection oriented service.
* Support for the operation of SCCP-User protocol peers.
* Support for the management of SCTP transport associations between
signalling gateways and IP-based signalling nodes.
* Support for distributed IP-based signalling nodes.
* Support for the asynchronous reporting of status changes to
management functions.
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1.2. Abbreviations and Terminology
1.2.1. Abbreviations
CAP - CAMEL Application Protocol.
GTT - Global Title Translation.
MAP - Mobile Application Protocol.
PC - Signalling System no. 7 Point Code.
RANAP - Radio Access Network Application Protocol.
SCTP - Stream Control Transmission Protocol.
SS7 - Signalling System no. 7.
TCAP - Transaction Capabilities Application Protocol.
1.2.2. Terminology
Signalling Gateway (SG) - Network element that terminates switched
circuit networks and transports SCCP-User signalling over IP to an IP
signalling endpoint. A Signalling Gateway could be modeled as one or
more Signalling Gateway Processes, which are located at the border of
the SS7 and IP networks. Where an SG contains more than one SGP, the
SG is a logical entity and the contained SGPs are assumed to be
coordinated into a single management view to the SS7 network and to
the supported Application Servers.
Application Server (AS) - A logical entity serving a specific Routing
Key. An example of an Application Server is a virtual IP database
element handling all requests for an SCCP-user. The AS contains a
set of one or more unique Application Server Processes, of which one
or more is normally actively processing traffic.
Application Server Process (ASP) - An Application Server Process
serves as an active or backup process of an Application Server (e.g.,
part of a distributed signalling node or database element). Examples
of ASPs are MGCs, IP SCPs, or IP-based HLRs. An ASP contains an SCTP
endpoint and may be configured to process traffic within more than
one Application Server.
IP Server Process (IPSP) - A process instance of an IP-based
application. An IPSP is essentially the same as an ASP, except that
it uses SUA in a peer-to-peer fashion. Conceptually, an IPSP does
not use the services of a Signalling Gateway.
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Signalling Gateway Process (SGP) - A process instance of a Signalling
Gateway. It serves as an active, load-sharing or broadcast process
of a Signalling Gateway.
Signalling Process - A process instance that uses SUA to communicate
with other signalling process. An ASP, a SGP and an IPSP are all
signalling processes.
Association - An association refers to an SCTP association. The
association provides the transport for the delivery of SCCP-User
protocol data units and SUA layer peer messages.
Routing Key - The Routing Key describes a set of SS7 parameters
and/or parameter ranges that uniquely defines the range of signalling
traffic configured to be handled by a particular Application Server.
An example would be where a Routing Key consists of a particular SS7
SCCP SSN plus an identifier to uniquely mark the network that the SSN
belongs to, for which all traffic would be directed to a particular
Application Server. Routing Keys are mutually exclusive in the sense
that a received SS7 signalling message cannot be directed to more
than one Routing Key. Routing Keys can be provisioned, for example,
by a MIB or registered using SUA's dynamic registration procedures.
Routing keys MUST NOT span multiple network appearances.
Routing Context - An Application Server Process may be configured to
process traffic within more than one Application Server. In this
case, the Routing Context parameter is exchanged between the SGP and
the ASP (or between two ASPs), identifying the relevant Application
Server. From the perspective of an SGP/ASP, the Routing Context
uniquely identifies the range of traffic associated with a particular
Application Server, which the ASP is configured to receive. There is
a 1:1 relationship between a Routing Context value and a Routing Key
within an AS. Therefore the Routing Context can be viewed as an
index into an AS Table containing the AS Routing Keys.
Address Mapping Function (AMF) - The AMF is an implementation
dependent function that is responsible for resolving the address
presented in the incoming SCCP/SUA message to correct SCTP
association for the desired endpoint. The AMF MAY use routing
context / routing key information as selection criteria for the
appropriate SCTP association.
Fail-over - The capability to reroute signalling traffic as required
to an alternate Application Server Process, or group of ASPs, within
an Application Server in the event of failure or unavailability of a
currently used Application Server Process. Fail-over may apply upon
the return to service of a previously unavailable Application Server
Process.
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Host - The computing platform that the SGP or ASP process is running
on.
Layer Management - Layer Management is a nodal function that handles
the inputs and outputs between the SUA layer and a local management
entity.
Network Appearance - The Network Appearance is an SUA local reference
(typically an integer) shared by SG and AS that together with a
Signalling Point Code uniquely identifies an SS7 node by indicating
the specific SS7 network it belongs to.
Network Byte Order - Most significant byte first, a.k.a. Big Endian.
Stream - A stream refers to an SCTP stream; a unidirectional logical
channel established from one SCTP endpoint to another associated SCTP
endpoint, within which all user messages are delivered sequenced
except for those submitted to the unordered delivery service.
Transport address - an address that serves as a source or destination
for the unreliable packet transport service used by SCTP. In IP
networks, a transport address is defined by the combination of an IP
address and an SCTP port number. Note, only one SCTP port may be
defined for each endpoint, but each SCTP endpoint may have multiple
IP addresses.
1.3. Signalling Transport Architecture
The framework architecture that has been defined for switched circuit
networks signalling transport over IP [2719] uses multiple
components, including an IP transport protocol, a signalling common
transport protocol and an adaptation module to support the services
expected by a particular switched circuit networks signalling
protocol from its underlying protocol layer.
In general terms, the SUA architecture can be modeled as a peer-to-
peer architecture. The first section considers the SS7 to IP
interworking architectures for connectionless and connection-oriented
transport. For this case, it is assumed that the ASP initiates the
establishment of the SCTP association with SG.
1.3.1. Protocol Architecture for Connectionless Transport
In this architecture, the SCCP and SUA layers interface in the SG.
Interworking between the SCCP and SUA layers is needed to provide for
the transfer of the user messages as well as the management messages.
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RFC 3868 SUA October 2004
******** SS7 *************** IP ********
* SEP *---------* *--------* *
* or * * SG * * ASP *
* STP * * * * *
******** *************** ********
+------+ +------+
| SUAP | | SUAP |
+------+ +------+------+ +------+
| SCCP | | SCCP | SUA | | SUA |
+------+ +------+------+ +------+
| MTP3 | | MTP3 | | | |
+------+ +------+ SCTP | | SCTP |
| MTP2 | | MTP2 | | | |
+------+ +------+------+ +------+
| L1 | | L1 | IP | | IP |
+------+ +------+------+ +------+
| | | |
+---------------+ +------------+
SUAP - SCCP/SUA User Protocol (TCAP, for example)
STP - SS7 Signalling Transfer Point
See Appendix A.3.1 for operation recommendations.
1.3.1.1. SG as endpoint
In this case, the connectionless SCCP messages are routed on point
code (PC) and subsystem number (SSN). The subsystem identified by
SSN and Routing Context is regarded as local to the SG. This means
from SS7 point of view, the SCCP-user is located at the SG.
1.3.1.2. Signalling Gateway as relay-point
A Global Title translation is executed at the signalling gateway,
before the destination of the message can be determined. The actual
location of the SCCP-user is irrelevant to the SS7 network. GT
Translation yields an "SCCP entity set", from which an Application
Server can be derived. Selection of the Application Server is based
on the SCCP called party address (and possibly other SS7 parameters
depending on the implementation).
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1.3.2. Protocol Architecture for Connection-Oriented Transport
In this architecture, the SCCP and SUA layers share an interface in
the signalling gateway process to associate the two connection
sections needed for the connection-oriented data transfer between SEP
and ASP. Both connection sections are setup when routing the Connect
Request messages from the signalling end point via signalling gateway
process to ASP and visa versa. The routing of the Connect Request
message is performed in the same way as described in 1.3.1.
******** SS7 *************** IP ********
* SEP/ *---------* SG *--------* ASP *
* STP * * * * *
******** *************** ********
+------+ +------+
| SUAP | | SUAP |
+------+ +------+------+ +------+
| SCCP | | SCCP | SUA | | SUA |
+------+ +------+------+ +------+
| MTP3 | | MTP3 | | | |
+------| +------+ SCTP | | SCTP |
| MTP2 | | MTP2 | | | |
+------+ +------+------+ +------+
| L1 | | L1 | IP | | IP |
+------+ +------+------+ +------+
| | | |
+---------------+ +------------+
SUAP - SCCP/SUA Application Protocol (e.g., - RANAP/RNSAP)
STP - SS7 Signalling Transfer Point
See Appendix A.3.2 for operation recommendations.
1.3.3. All IP Architecture
This architecture can be used to carry a protocol that uses the
transport services of SCCP within an IP network. This allows
flexibility in developing networks, especially when interaction
between legacy signalling is not needed. The architecture removes
the need for signalling gateway functionality.
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RFC 3868 SUA October 2004
******** IP ********
* IPSP *--------* IPSP *
******** ********
+------+ +------+
| SUAP | | SUAP |
+------+ +------+
| SUA | | SUA |
+------+ +------+
| SCTP | | SCTP |
+------+ +------+
| IP | | IP |
+------+ +------+
| |
+----------------+
SUAP - SCCP/SUA Application Protocol (e.g., - RANAP/RNSAP)
1.3.4. ASP Fail-over Model and Terminology
The SUA protocol supports ASP fail-over functions to support a high
availability of transaction processing capability.
An Application Server can be considered as a list of all ASPs
configured/registered to handle SCCP-user messages within a certain
range of routing information, known as a Routing Key. One or more
ASPs in the list may normally be active to handle traffic, while
others may be inactive but available in the event of failure or
unavailability of the active ASP(s).
For operation recommendations, see Appendix A.
1.4. Services Provided by the SUA Layer
1.4.1. Support for the transport of SCCP-User Messages
The SUA supports the transfer of SCCP-user messages. The SUA layer
at the signalling gateway and at the ASP support the seamless
transport of user messages between the signalling gateway and the
ASP.
1.4.2. SCCP Protocol Class Support
Depending upon the SCCP-users supported, the SUA supports the 4
possible SCCP protocol classes transparently. The SCCP protocol
classes are defined as follows:
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* Protocol class 0 provides unordered transfer of SCCP-user messages
in a connectionless manner.
* Protocol class 1 allows the SCCP-user to select the sequenced
delivery of SCCP-user messages in a connectionless manner.
* Protocol class 2 allows the bidirectional transfer of SCCP-user
messages by setting up a temporary or permanent signalling
connection.
* Protocol class 3 allows the features of protocol class 2 with the
inclusion of flow control. Detection of message loss or mis-
sequencing is included.
Protocol classes 0 and 1 make up the SCCP connectionless service.
Protocol classes 2 and 3 make up the SCCP connection-oriented
service.
1.4.3. Native Management Functions
The SUA layer provides the capability to indicate errors associated
with the SUA-protocol messages and to provide notification to local
management and the remote peer as is necessary.
1.4.4. Interworking with SCCP Network Management Functions
SUA uses the existing ASP management messages for ASP status
handling. The interworking with SCCP management messages consists of
DUNA, DAVA, DAUD, DRST, DUPU or SCON messages (defined in section 3)
on receipt of SSP, SSA, SST or SSC (defined by SCCP) to the
appropriate ASPs. See also chapter 1.4.5. The primitives below are
sent between the SCCP and SUA management functions in the SG to
trigger events in the IP and SS7 domain.
Generic |Specific |
Name |Name |ANSI/ITU Reference
----------+-----------+---------------------------------------------
N-State |Request |ITU-Q.711 Chap 6.3.2.3.2 (Tab 16/Q.711)
|Indication |ANSI-T1.112 Chap 2.3.2.3.2 (Tab 8E/T1.112.1)
----------+-----------+---------------------------------------------
N-PCstate |Indication |ITU-Q.711 Chap 6.3.2.3.3 (Tab 1/Q.711)
| |ANSI-T1.112 Chap 2.3.2.3.4 (Tab 8G/T1.112.1)
----------+-----------+---------------------------------------------
N-Coord |Request |ITU-Q.711 Chap 6.3.2.3.1 (Tab 15/Q.711)
|Indication |ANSI-T1.112 Chap 2.3.2.3.3 (Tab 8F/T1.112.1)
|Response |
|Confirm |
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1.4.5. Support for the management between the SGP and ASP.
The SUA layer provides interworking with SCCP management functions at
the SG for operation between the switched circuit networks and the IP
network. It should:
* Provide an indication to the SCCP-user at an ASP that a SS7
endpoint/peer is unreachable.
* Provide an indication to the SCCP-user at an ASP that a SS7
endpoint/peer is reachable.
* Provide congestion indication to SCCP-user at an ASP.
* Provide the initiation of an audit of SS7 endpoints at the SG.
1.4.6. Relay function
For network scalability purposes, the SUA may be enhanced with a
relay functionality to determine the next hop SCTP association toward
the destination SUA endpoint.
The determination of the next hop may be based on Global Title
information (e.g., E.164 number), in analogy with SCCP GTT in SS7
networks, modeled in [ITU-T Q.714]. It may also be based on Hostname
information, IP address or pointcode contained in the called party
address.
This allows for greater scalability, reliability and flexibility in
wide-scale deployments of SUA. The usage of a relay function is a
deployment decision.
1.5. Internal Functions Provided in the SUA Layer
To perform its addressing and relaying capabilities, the SUA makes
use of an Address Mapping Function (AMF). This function is
considered part of SUA, but the way it is realized is left
implementation / deployment dependent (local tables, DNS [3761],
LDAP, etc.)
The AMF is invoked when a message is received at the incoming
interface. The AMF is responsible for resolving the address
presented in the incoming SCCP/SUA message to SCTP associations to
destinations within the IP network. The AMF will select the
appropriate SCTP association based upon routing context / routing key
information available. The destination might be the end SUA node or
a SUA relay node. The Routing Keys reference an Application Server,
which will have one or more ASPs processing traffic for the AS. The
availability and status of the ASPs is handled by SUA ASP management
messages.
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Possible SS7 address/routing information that comprise a Routing Key
entry includes, for example, OPC, DPC, SIO found in the MTP3 routing
label, SCCP subsystem number, or Transaction ID. IP addresses and
hostnames can also be used as Routing Key Information.
It is expected that the routing keys be provisioned via a MIB,
dynamic registration or external process, such as a database.
1.5.1. Address Mapping at the SG
Normally, one or more ASPs are active in the AS (i.e., currently
processing traffic) but in certain failure and transition cases it is
possible that there may not be an active ASP available. The SGP will
buffer the message destined for this AS for a time T(r) or until an
ASP becomes available. When no ASP becomes available before expiry
of T(r), the SGP will flush the buffered messages and initiate the
appropriate return or refusal procedures.
If there is no address mapping match for an incoming message, a
default treatment MAY be specified. Possible solutions are to
provide a default Application Server to direct all unallocated
traffic to a (set of) default ASP(s), or to drop the messages and
provide a notification to management. The treatment of unallocated
traffic is implementation dependent.
1.5.2. Address Mapping at the ASP
To direct messages to the SS7 network, the ASP MAY perform an address
mapping to choose the proper SGP for a given message. This is
accomplished by observing the Destination Point Code and other
elements of the outgoing message, SS7 network status, SGP
availability, and Routing Context configuration tables.
A Signalling Gateway may be composed of one or more SGPs. There is,
however, no SUA messaging to manage the status of an SGP. Whenever
an SCTP association to an SGP exists, it is assumed to be available.
Also, every SGP of one SG communicating with one ASP regarding one AS
provides identical SS7 connectivity to this ASP.
An ASP routes responses to the SGP that it received messages from;
within the routing context which it is currently active and receiving
traffic.
1.5.3. Address Mapping Function at a Relay Node
The relay function is invoked when:
- Routing is on Global Title
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- Routing is on Hostname
- Routing is on SSN and PC or SSN and IP Address and the address
presented is not the one of the relay node
Translation/resolution of the above address information yields one of
the following:
- Route on SSN: SCTP association ID toward the destination node, SSN
and optionally Routing Context and/or IP address.
- Route on GT: SCTP association ID toward next relay node, (new) GT
and optionally SSN and/or Routing Context.
- Routing on Hostname: SCTP association ID toward next relay node,
(new) Hostname and optionally SSN and/or Routing Context.
- A local SUA-user (combined relay/end node)
To prevent looping, an SS7 hop counter is used. The originating end
node (be it an SS7 or an IP node) sets the value of the SS7 hop
counter to the maximum value (15 or less). Each time the relay
function is invoked within an intermediate (relay) node, the SS7 hop
counter is decremented. When the value reaches zero, the return or
refusal procedures are invoked with reason "Hop counter violation".
1.5.4. SCTP Stream Mapping
The SUA supports SCTP streams. Signalling Gateway SG and Application
Servers need to maintain a list of SCTP and SUA-users for mapping
purposes. SCCP-users requiring sequenced message transfer need to be
sent over a stream with sequenced delivery.
SUA uses stream 0 for SUA management messages. It is OPTIONAL that
sequenced delivery be used to preserve the order of management
message delivery.
Stream selection based on protocol class:
- Protocol class 0: SUA MAY select unordered delivery. The stream
selected is based on traffic information available to the SGP or
ASP.
- Protocol class 1: SUA MUST select ordered delivery. The stream
selected is based upon the sequence parameter given by the upper
layer over the primitive interface and other traffic information
available to the SGP or ASP
- Protocol classes 2 and 3: SUA MUST select ordered delivery. The
stream selected is based upon the source local reference of the
connection and other traffic information available to the SGP or
ASP.
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1.5.5. Flow Control
Local Management at an ASP may wish to stop traffic across an SCTP
association to temporarily remove the association from service or to
perform testing and maintenance activity. The function could
optionally be used to control the start of traffic on to a newly
available SCTP association.
1.5.6. Congestion Management
The SUA layer is informed of local and IP network congestion by means
of an implementation-dependent function (e.g., an implementation-
dependent indication from the SCTP of IP network congestion).
At an ASP or IPSP, the SUA layer indicates congestion to local SCCP-
Users by means of an appropriate SCCP primitive (e.g., N-INFORM, N-
NOTICE), as per current SCCP procedures, to invoke appropriate upper
layer responses. When an SG determines that the transport of SS7
messages is encountering congestion, the SG MAY trigger SS7 SCCP
Congestion messages to originating SS7 nodes, per the congestion
procedures of the relevant SCCP standard. The triggering of SS7 SCCP
Management messages from an SG is an implementation-dependent
function.
The SUA layer at an ASP or IPSP MAY indicate local congestion to an
SUA peer with an SCON message. When an SG receives a congestion
message (SCON) from an ASP, and the SG determines that an endpoint is
now encountering congestion, it MAY trigger congestion procedures of
the relevant SCCP standard.
1.6. Definition of SUA Boundaries
1.6.1. Definition of the upper boundary
The following primitives are supported between the SUA and an SCCP-
user (a reference to ITU and ANSI sections where these primitives and
corresponding parameters are described, is also given):
Generic |Specific |
Name |Name |ANSI/ITU Reference
------------+----------+-------------------------------------------
N-CONNECT |Request |ITU-Q.711 Chap 6.1.1.2.2 (Tab 2/Q.711)
|Indication|ANSI-T1.112 Chap 2.1.1.2.2 (Tab 2/T1.112.1)
|Response |
|Confirm |
------------+----------+-------------------------------------------
N-DATA |Request |ITU-Q.711 Chap 6.1.1.2.3 (Tab 3/Q.711)
|Indication|ANSI-T1.112 Chap 2.1.1.2.3 (Tab 3/T1.112.1)
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------------+----------+-------------------------------------------
N-EXPEDITED |Request |ITU-Q.711 Chap 6.1.1.2.3 (Tab 4/Q.711)
DATA |Indication|ANSI-T1.112 Chap 2.1.1.2.3 (Tab 4/T1.112.1)
------------+----------+-------------------------------------------
N-RESET |Request |ITU-Q.711 Chap 6.1.1.2.3 (Tab 5/Q.711)
|Indication|ANSI-T1.112 Chap 2.1.1.2.3 (Tab 5/T1.112.1)
|Response |
|Confirm |
------------+----------+-------------------------------------------
N-DISCONNECT|Request |ITU-Q.711 Chap 6.1.1.2.4 (Tab 6/Q.711)
|Indication|ANSI-T1.112 Chap 2.1.1.2.4 (Tab 6/T1.112.1)
------------+----------+-------------------------------------------
N-INFORM |Request |ITU-Q.711 Chap 6.1.1.3.2 (Tab 8/Q.711)
|Indication|ANSI-T1.112 Chap 2.1.1.2.5 (Tab 6A/T1.112.1)
------------+----------+-------------------------------------------
N-UNITDATA |Request |ITU-Q.711 Chap 6.2.2.3.1 (Tab 12/Q.711)
|Indication|ANSI-T1.112 Chap 2.2.2.3.1 (Tab 8A/T1.112.1)
------------+----------+-------------------------------------------
N-NOTICE |Indication|ITU-Q.711 Chap 6.2.2.3.2 (Tab 13/Q.711)
| |ANSI-T1.112 Chap 2.2.2.3.2 (Tab 8B/T1.112.1)
------------+----------+--------------------------------------------
N-STATE |Request |ITU-Q.711 Chap 6.3.2.3.2 (Tab 16/Q.711)
|Indication|ANSI-T1.112 Chap 2.3.2.3.2 (Tab 8E/T1.112.1)
------------+----------+--------------------------------------------
N-PCSTATE |Indication|ITU-Q.711 Chap 6.3.2.3.3 (Tab 17/Q.711)
| |ANSI-T1.112 Chap 2.3.2.3.4 (Tab 8G/T1.112.1)
------------+----------+--------------------------------------------
N-COORD |Request |ITU-Q.711 Chap 6.3.2.3.1 (Tab 15/Q.711)
|Indication|ANSI-T1.112 Chap 2.3.2.3.3 (Tab 8F/T1.112.1)
|Response |
|Confirm |
1.6.2. Definition of the lower boundary
The upper layer primitives provided by the SCTP are provided in
[SCTP].
1.6.3. Definition of the Boundary between SUA and Layer Management
M-SCTP_ESTABLISH request
Direction: LM -> SUA
Purpose: LM requests ASP to establish an SCTP association with its
peer.
M-SCTP_ESTABLISH confirm
Direction: SUA -> LM
Purpose: ASP confirms to LM that it has established an SCTP
association with its peer.
Loughney, et al. Standards Track [Page 15]
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M-SCTP_ESTABLISH indication
Direction: SUA -> LM
Purpose: SUA informs LM that a remote ASP has established an SCTP
association.
M-SCTP_RELEASE request
Direction: LM -> SUA
Purpose: LM requests ASP to release an SCTP association with its
peer.
M-SCTP_RELEASE confirm
Direction: SUA -> LM
Purpose: ASP confirms to LM that it has released SCTP association
with its peer.
M-SCTP_RELEASE indication
Direction: SUA -> LM
Purpose: SUA informs LM that a remote ASP has released an SCTP
Association or the SCTP association has failed.
M-SCTP RESTART indication
Direction: SUA -> LM
Purpose: SUA informs LM that an SCTP restart indication has been
received.
M-SCTP_STATUS request
Direction: LM -> SUA
Purpose: LM requests SUA to report the status of an SCTP
association.
M-SCTP_STATUS confirm
Direction: SUA -> LM
Purpose: SUA responds with the status of an SCTP association.
M-SCTP STATUS indication
Direction: SUA -> LM
Purpose: SUA reports the status of an SCTP association.
M-ASP_STATUS request
Direction: LM -> SUA
Purpose: LM requests SUA to report the status of a local or remote
ASP.
M-ASP_STATUS confirm
Direction: SUA -> LM
Purpose: SUA reports status of local or remote ASP.
Loughney, et al. Standards Track [Page 16]
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M-AS_STATUS request
Direction: LM -> SUA
Purpose: LM requests SUA to report the status of an AS.
M-AS_STATUS confirm
Direction: SUA -> LM
Purpose: SUA reports the status of an AS.
M-NOTIFY indication
Direction: SUA -> LM
Purpose: SUA reports that it has received a Notify message from its
peer.
M-ERROR indication
Direction: SUA -> LM
Purpose: SUA reports that it has received an Error message from its
peer or that a local operation has been unsuccessful.
M-ASP_UP request
Direction: LM -> SUA
Purpose: LM requests ASP to start its operation and send an ASP Up
message to its peer.
M-ASP_UP confirm
Direction: SUA -> LM
Purpose: ASP reports that is has received an ASP UP Ack message
from its peer.
M-ASP_UP indication
Direction: SUA -> LM
Purpose: SUA reports it has successfully processed an incoming ASP
Up message from its peer.
M-ASP_DOWN request
Direction: LM -> SUA
Purpose: LM requests ASP to stop its operation and send an ASP Down
message to its peer.
M-ASP_DOWN confirm
Direction: SUA -> LM
Purpose: ASP reports that is has received an ASP Down Ack message
from its peer.
M-ASP_DOWN indication
Direction: SUA -> LM
Purpose: SUA reports it has successfully processed an incoming ASP
Down message from its peer, or the SCTP association has
been lost/reset.
Loughney, et al. Standards Track [Page 17]
RFC 3868 SUA October 2004
M-ASP_ACTIVE request
Direction: LM -> SUA
Purpose: LM requests ASP to send an ASP Active message to its peer.
M-ASP_ACTIVE confirm
Direction: SUA -> LM
Purpose: ASP reports that is has received an ASP Active Ack message
from its peer.
M-ASP_ACTIVE indication
Direction: SUA -> LM
Purpose: SUA reports it has successfully processed an incoming ASP
Active message from its peer.
M-ASP_INACTIVE request
Direction: LM -> SUA
Purpose: LM requests ASP to send an ASP Inactive message to its
peer.
M-ASP_INACTIVE confirm
Direction: LM -> SUA
Purpose: ASP reports that is has received an ASP Inactive
Ack message from its peer.
M-ASP_INACTIVE indication
Direction: SUA -> LM
Purpose: SUA reports it has successfully processed an incoming ASP
Inactive message from its peer.
M-AS_ACTIVE indication
Direction: SUA -> LM
Purpose: SUA reports that an AS has moved to the AS-ACTIVE state.
M-AS_INACTIVE indication
Direction: SUA -> LM
Purpose: SUA reports that an AS has moved to the AS-INACTIVE state.
M-AS_DOWN indication
Direction: SUA -> LM
Purpose: SUA reports that an AS has moved to the AS-DOWN state.
Loughney, et al. Standards Track [Page 18]
RFC 3868 SUA October 2004
If the SUA layer supports dynamic registration of Routing Key, the
layer MAY support the following additional primitives:
M-RK_REG request
Direction: LM -> SUA
Purpose: LM requests ASP to register RK(s) with its peer by sending
REG REQ message.
M-RK_REG confirm
Direction: SUA -> LM
Purpose: ASP reports that it has received REG RSP message with
registration status as successful from its peer.
M-RK_REG indication
Direction: SUA -> LM
Purpose: SUA informs LM that it has successfully processed an
incoming REG REQ message.
M-RK_DEREG request
Direction: LM -> SUA
Purpose: LM requests ASP to deregister RK(s) with its peer by
sending DEREG REQ message.
M-RK_DEREG confirm
Direction: SUA -> LM
Purpose: ASP reports that it has received DEREG RESP message with
deregistration status as successful from its peer.
M-RK_DEREG indication
Direction: SUA -> LM
Purpose: SUA informs LM that it has successfully processed an
incoming DEREG REQ from its peer.
2. Conventions
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, NOT RECOMMENDED, MAY, and OPTIONAL, when
they appear in this document, are to be interpreted as described in
BCP 14, RFC 2119 [2119].
3. Protocol Elements
The general message format includes a Common Message Header together
with a list of zero or more parameters as defined by the Message
Type.
For forward compatibility, all Message Types may have attached
parameters even if none are specified in this version.
Loughney, et al. Standards Track [Page 19]
RFC 3868 SUA October 2004
The Reserved field is set to 0 in messages sent and is not to be
examined in messages received.
3.1. Common Message Header
The protocol messages for the SCCP-User Adaptation Protocol requires
a message structure which contains a version, message class, message
type, message length and message contents. This message header is
common among all signalling protocol adaptation layers:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Reserved | Message Class | Message Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Data |
Note that the 'data' portion of SUA messages SHALL contain SCCP-User
data, not the encapsulated SCCP message.
Optional parameters can only occur at most once in an SUA message.
3.1.1. SUA Protocol Version
The version field (ver) contains the version of the SUA adaptation
layer. The supported versions are:
1 SUA version 1.0
3.1.2. Message Classes
Message Classes
0 SUA Management (MGMT) Message
1 Reserved
2 Signalling Network Management (SNM) Messages
3 ASP State Maintenance (ASPSM) Messages
4 ASP Traffic Maintenance (ASPTM) Messages
5 Reserved
6 Reserved
7 Connectionless Messages
8 Connection-Oriented Messages
9 Routing Key Management (RKM) Messages.
10 - 127 Reserved by the IETF
128 - 255 Reserved for IETF-Defined Message Class Extensions
Loughney, et al. Standards Track [Page 20]
RFC 3868 SUA October 2004
3.1.3. Message Types
SUA Management Messages
0 Error (ERR)
1 Notify (NTFY)
2 - 127 Reserved by the IETF
128- 255 Reserved for IETF-Defined Message Class Extensions
Signalling Network Management (SNM) Messages
0 Reserved
1 Destination Unavailable (DUNA)
2 Destination Available (DAVA)
3 Destination State Audit (DAUD)
4 Signalling Congestion (SCON)
5 Destination User Part Unavailable (DUPU)
6 Destination Restricted (DRST)
7 - 127 Reserved by the IETF
128 - 255 Reserved for IETF-Defined Message Class Extensions
Application Server Process State Maintenance (ASPSM) Messages
0 Reserved
1 ASP Up (UP)
2 ASP Down (DOWN)
3 Heartbeat (BEAT)
4 ASP Up Ack (UP ACK)
5 ASP Down Ack (DOWN ACK)
6 Heartbeat Ack (BEAT ACK)
7 - 127 Reserved by the IETF
128 - 255 Reserved for IETF-Defined Message Class Extensions
ASP Traffic Maintenance (ASPTM) Messages
0 Reserved
1 ASP Active (ACTIVE)
2 ASP Inactive (INACTIVE)
3 ASP Active Ack (ACTIVE ACK)
4 ASP Inactive Ack (INACTIVE ACK)
5 - 127 Reserved by the IETF
128 - 255 Reserved for IETF-Defined Message Class Extensions
Loughney, et al. Standards Track [Page 21]
RFC 3868 SUA October 2004
Routing Key Management (RKM) Messages
0 Reserved
1 Registration Request (REG REQ)
2 Registration Response (REG RSP)
3 Deregistration Request (DEREG REQ)
4 Deregistration Response (DEREG RSP)
5 - 127 Reserved by the IETF
128 - 255 Reserved for IETF-Defined Message Class Extensions
Connectionless (CL) Messages
0 Reserved
1 Connectionless Data Transfer (CLDT)
2 Connectionless Data Response (CLDR)
3 - 127 Reserved by the IETF
128 - 255 Reserved for IETF-Defined Message Class Extensions
Connection-Oriented (CO) Messages
0 Reserved
1 Connection Request (CORE)
2 Connection Acknowledge (COAK)
3 Connection Refused (COREF)
4 Release Request (RELRE)
5 Release Complete (RELCO)
6 Reset Confirm (RESCO)
7 Reset Request (RESRE)
8 Connection Oriented Data Transfer (CODT)
9 Connection Oriented Data Acknowledge (CODA)
10 Connection Oriented Error (COERR)
11 Inactivity Test (COIT)
12 - 127 Reserved by the IETF
128 - 255 Reserved for IETF-Defined Message Class Extensions
3.1.4. Message Length
The Message Length defines the length of the message in octets,
including the header and including all padding bytes. Message Length
is a 32-bit identifier.
3.1.5. Tag-Length-Value Format
SUA messages consist of a Common Header followed by zero or more
parameters, as defined by the message type. The Tag-Length-Value
(TLV) parameters contained in a message are defined in a Tag-Length-
Value format as shown below.
Loughney, et al. Standards Track [Page 22]
RFC 3868 SUA October 2004
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Parameter Tag | Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\ \
/ Parameter Value /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameter Tag: 16 bits (unsigned integer)
Tag field is a 16-bit identifier of the type of parameter. It
takes a value of 0 to 65535.
Parameter Length: 16 bits (unsigned integer)
The Parameter Length field contains the size of the parameter in
bytes, including the Parameter Tag, Parameter Length, and
Parameter Value fields. The Parameter Length does not include any
padding bytes. However, composite parameters will contain all
padding bytes, since all parameters contained within this
composite parameter will be considered multiples of 4 bytes.
Parameter Value: variable-length.
The Parameter Value field contains the actual information to be
transfered in the parameter.
The total length of a parameter (including Tag, Parameter Length
and Value fields) MUST be a multiple of 4 bytes. If the length of
the parameter is not a multiple of 4 bytes, the sender pads the
parameter at the end (i.e., after the Parameter Value field) with
all zero bytes. The length of the padding is NOT included in the
parameter length field. A sender SHOULD NOT pad with more than 3
bytes. The receiver MUST ignore the padding bytes.
Implementation note: The use of TLV in principle allows the
parameters to be placed in a random order in the message. However,
some guidelines should be considered for easy processing in the
following order:
- Parameters needed to correctly process other message parameters,
preferably should precede these parameters (such as Routing
Context).
- Mandatory parameters preferably SHOULD precede any optional
parameters.
- The data parameter will normally be the final one in the message.
Loughney, et al. Standards Track [Page 23]
RFC 3868 SUA October 2004
- The receiver SHOULD accept parameters in any order, except where
explicitly mandated.
3.2. SUA Connectionless Messages
The following section describes the SUA Connectionless transfer
messages and parameter contents. The general message format includes
a Common Message Header together with a list of zero or more
parameters as defined by the Message Type. All Message Types can
have attached parameters.
3.2.1. Connectionless Data Transfer (CLDT)
This message transfers data between one SUA to another.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0115 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Protocol Class |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0102 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0103 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Destination Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0116 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Control |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0101 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SS7 Hop Count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0113 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Importance |
Loughney, et al. Standards Track [Page 24]
RFC 3868 SUA October 2004
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0114 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Priority |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0013 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Correlation ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0117 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segmentation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010B | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Protocol Class Mandatory
Source Address Mandatory
Destination Address Mandatory
Sequence Control Mandatory
SS7 Hop Count Optional
Importance Optional
Message Priority Optional
Correlation ID Optional
Segmentation Optional
Data Mandatory
Implementation note: This message covers the following SCCP messages:
unitdata (UDT), extended unitdata (XUDT), long unitdata (LUDT).
3.2.2. Connectionless Data Response (CLDR)
This message is used as a response message by the peer to report
errors in the received CLDT message, when the return on error option
is set.
Loughney, et al. Standards Track [Page 25]
RFC 3868 SUA October 2004
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0106 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SCCP Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0102 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0103 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Destination Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0101 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SS7 Hop Count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0113 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Importance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0114 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Priority |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0013 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Correlation ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0117 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segmentation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010b | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
/ Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. Standards Track [Page 26]
RFC 3868 SUA October 2004
Parameters
Routing Context Mandatory
SCCP Cause Mandatory
Source Address Mandatory
Destination Address Mandatory
SS7 Hop Count Optional
Importance Optional
Message Priority Optional
Correlation ID Optional
Segmentation Optional
Data Optional
Implementation note: This message covers the following SCCP messages:
unitdata service (UDTS), extended unitdata service (XUDTS) and long
unitdata service (LUDTS).
3.3. Connection Oriented Messages
3.3.1. Connection Oriented Data Transfer (CODT)
This message transfers data between one SUA to another for
connection-oriented service.
Loughney, et al. Standards Track [Page 27]
RFC 3868 SUA October 2004
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0107 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0114 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Priority |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0013 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Correlation ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010b | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Sequence Number Optional *1
Destination Reference Number Mandatory
Message Priority Optional
Correlation ID Optional
Data Mandatory
NOTE *1: This parameter is not present in case of Expedited Data
(ED).
Implementation note: For the CODT to represent DT1, DT2 and ED
messages, the following conditions MUST be met:
DT1 is represented by a CODT when:
Sequence Number parameter is present (contains "more" indicator).
Loughney, et al. Standards Track [Page 28]
RFC 3868 SUA October 2004
DT2 is represented by a CODT when:
Sequence Number parameter is present (contains P(S), P(R) and more
indicator)
ED is represented by a CODT with:
Sequence Number parameter is not present
3.3.2. Connection Oriented Data Acknowledge (CODA)
The peer uses this message to acknowledge receipt of data. This
message is used only with protocol class 3.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0108 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receive Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010A | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Credit |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Destination Reference Number Mandatory
Receive Sequence Number Optional *1
Credit Mandatory *1
NOTE *1: Mandatory when representing Data Acknowledgement (AK).
Implementation note: For the CODA to represent DA and EA messages,
the following conditions MUST be met:
DA is represented by a CODA when:
Receive Sequence Number parameter is present (contains P(S), P(R)
and more indicator)
Loughney, et al. Standards Track [Page 29]
RFC 3868 SUA October 2004
EA is represented by a CODA when:
Receive Sequence Number parameter is not present
3.3.3. Connection Request (CORE)
This message is used for establishing a signalling connection between
two peer endpoints.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0115 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Protocol Class |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0104 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0103 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Destination Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0116 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Control |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0107 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0102 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0101 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SS7 Hop Count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0113 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. Standards Track [Page 30]
RFC 3868 SUA October 2004
| Importance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0114 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Priority |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010A | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Credit |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010b | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Protocol Class Mandatory
Source Reference Number Mandatory
Destination Address Mandatory
Sequence Control Mandatory
Sequence Number Optional *1
Source Address Optional
SS7 Hop Count Optional
Importance Optional
Message Priority Optional
Credit Optional *1
Data Optional
NOTE *1: Mandatory for protocol class 3 only.
Implementation note: This message covers the following SCCP message:
Connection Request (CR).
Loughney, et al. Standards Track [Page 31]
RFC 3868 SUA October 2004
3.3.4. Connection Acknowledge (COAK)
This message is used to acknowledge a connection request from the
peer endpoint.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0115 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Protocol Class |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0104 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x01116 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Control |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010A | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Credit |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0102 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0113 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Importance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0114 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Priority |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0103 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. Standards Track [Page 32]
RFC 3868 SUA October 2004
/ Destination Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010b | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Protocol Class Mandatory
Destination Reference Number Mandatory
Source Reference Number Mandatory
Sequence Control Mandatory
Credit Mandatory *2
Source Address Optional
Importance Optional
Message Priority Optional
Destination Address Optional *1
Data Optional
NOTE *1: Destination Address parameter will be present in case
that the received CORE message conveys the Source
Address parameter.
NOTE *2: Only applicable for protocol class 3.
Implementation note: This message covers the following SCCP message:
Connection Confirm (CC).
Loughney, et al. Standards Track [Page 33]
RFC 3868 SUA October 2004
3.3.5. Connection Refused (COREF)
This message is used to refuse a connection request between two peer
endpoints.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0106 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SCCP Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0102 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0103 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Destination Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0113 | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Importance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010B | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. Standards Track [Page 34]
RFC 3868 SUA October 2004
Parameters
Routing Context Mandatory
Destination Reference Number Mandatory
SCCP Cause Mandatory
Source Address Optional
Destination Address Optional *1
Importance Optional
Data Optional
Note *1: Destination Address parameter will be present in case
that the received CORE message conveys the Source Address
parameter.
Implementation note: This message covers the following SCCP message:
Connection REFused (CREF).
Loughney, et al. Standards Track [Page 35]
RFC 3868 SUA October 2004
3.3.6. Release Request (RELRE)
This message is used to request a signalling connection between two
peer endpoints be released. All associated resources can then be
released.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0104 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0106 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SCCP Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0113 | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Importance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010b | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Destination Reference Number Mandatory
Source Reference Number Mandatory
SCCP Cause Mandatory
Importance Optional
Data Optional
Implementation note: This message covers the following SCCP message:
connection ReLeaSeD (RLSD).
Loughney, et al. Standards Track [Page 36]
RFC 3868 SUA October 2004
3.3.7. Release Complete (RELCO)
This message is used to acknowledge the release of a signalling
connection between two peer endpoints. All associated resources
should be released.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0104 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0113 | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Importance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Destination Reference Number Mandatory
Source Reference Number Mandatory
Importance Optional
Implementation note: This message covers the following SCCP message:
ReLease Complete (RLC).
Loughney, et al. Standards Track [Page 37]
RFC 3868 SUA October 2004
3.3.8. Reset Request (RESRE)
This message is used to indicate that the sending SCCP/SUA wants to
initiate a reset procedure (reinitialization of sequence numbers) to
the peer endpoint.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0104 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0106 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SCCP Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Destination Reference Number Mandatory
Source Reference Number Mandatory
SCCP Cause Mandatory
Implementation note: This message covers the following SCCP message:
ReSet Request (RSR).
Loughney, et al. Standards Track [Page 38]
RFC 3868 SUA October 2004
3.3.9. Reset Confirm (RESCO)
This message is used to confirm the Reset Request.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0104 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Destination Reference Number Mandatory
Source Reference Number Mandatory
Implementation note: This message covers the following SCCP message:
ReSet Confirmation (RSC).
Loughney, et al. Standards Track [Page 39]
RFC 3868 SUA October 2004
3.3.10. Connection Oriented Error (COERR)
The COERR message is sent to indicate a protocol data unit error.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0106 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SCCP Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Destination Reference Number Mandatory
SCCP Cause Mandatory
Implementation note: This message covers the following SCCP message:
Protocol Data Unit ERRor (ERR).
Loughney, et al. Standards Track [Page 40]
RFC 3868 SUA October 2004
3.3.11. Connection Oriented Inactivity Test (COIT)
This message is used for auditing the signalling connection state and
the consistency of connection data at both ends of the signalling
connection.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0115 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Protocol Class |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0104 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Reference Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0105 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0107 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010A | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Credit |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Mandatory
Protocol Class Mandatory
Source Reference Number Mandatory
Destination Reference number Mandatory
Sequence Number Mandatory *1
Credit Mandatory *1
NOTE *1: Information in these parameter fields reflects those
values sent in the last data form 2 or data
acknowledgement message. They are ignored if the
protocol class indicates class 2.
Loughney, et al. Standards Track [Page 41]
RFC 3868 SUA October 2004
Implementation note: This message covers the following SCCP message:
Inactivity Test (IT).
3.4. Signalling Network Management (SNM) Messages
3.4.1. Destination Unavailable (DUNA)
In the scope of SUA, this message is covered by the PC- or N-state
indication passed between SCCP and local SCCP-user. The DUNA message
is sent from the SG or relay node to all concerned ASPs (servicing
SCCP-users considered local to the SG or relay node, see chapter
1.3.1.1), when a destination or SCCP-user has become unreachable. The
SUA-User at the ASP is expected to stop traffic to the affected
destination or SCCP-user through the SG or relay node initiating the
DUNA.
The format for DUNA Message parameters is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0012 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Affected Point Code /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x8003 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0112 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SMI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. Standards Track [Page 42]
RFC 3868 SUA October 2004
Parameters
Routing Context Optional
Affected Point Code Mandatory *1
SSN Optional *1
SMI Optional
Info String Optional
Note 1: When the SSN is included, the DUNA message
corresponds to the SCCP N-STATE primitive. When SSN
is not, the DUNA message corresponds to the SCCP N-PCSTATE
primitive. The Affected Point Code parameter can only
contain one point code when SSN is present.
3.4.2. Destination Available (DAVA)
In the scope of SUA, this message is covered by the PC- and N-state
indication passed between SCCP and local SCCP-user. The DAVA message
is sent from the SG or relay node to all concerned ASPs (servicing
SCCP-users considered local to the SG or relay node, see chapter
1.3.1.1) to indicate that a destination (PC or SCCP-user) is now
reachable. The ASP SUA-User protocol is expected to resume traffic
to the affected destination through the SG or relay node initiating
the DAVA.
Loughney, et al. Standards Track [Page 43]
RFC 3868 SUA October 2004
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0012 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Affected Point Code /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x8003 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0112 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SMI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Optional
Affected Point Code Mandatory *1
SSN Optional *1
SMI Optional
Info String Optional
Note 1: When the SSN is included, the DAVA message corresponds to
the SCCP N-STATE primitive. When SSN is not included, the
DAVA message corresponds to the SCCP N-PCSTATE primitive.
The Affected Point Code can only contain one point code
when SSN is present.
3.4.3. Destination State Audit (DAUD)
The DAUD message can be sent from the ASP to the SG (or relay node)
to query the availability state of the routes to an affected
destination. A DAUD may be sent periodically after the ASP has
received a DUNA, until a DAVA is received. The DAUD can also be sent
when an ASP recovers from isolation from the SG (or relay node).
Loughney, et al. Standards Track [Page 44]
RFC 3868 SUA October 2004
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0012 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Affected Point Code /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x8003 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010C | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| User/Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Optional
Affected Point Code Mandatory *1
SSN Optional *1
User / Cause Optional
Info String Optional
Note 1: If the SSN is present, the DAUD is "soliciting" N-STATE
primitives, otherwise it is "soliciting" N-PCSTATE
primitives.
Loughney, et al. Standards Track [Page 45]
RFC 3868 SUA October 2004
3.4.4. Signalling Congestion (SCON)
The SCON message can be sent from the SG or relay node to all
concerned ASPs to indicate that the congestion level in the SS7
network to a specified destination has changed.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0012 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Affected Point Code /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x8003 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0118 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Congestion Level |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0112 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SMI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Optional
Affected Point Code Mandatory *1
SSN Optional *1
Congestion Level Mandatory
SMI Optional
Info String Optional
Note 1: When the SSN is included, the SCON message corresponds to
the SCCP N-STATE primitive. When the SSN is not
included, the SCON message corresponds to the SCCP
Loughney, et al. Standards Track [Page 46]
RFC 3868 SUA October 2004
N-PCSTATE primitive reporting signalling point or network
congestion status.
3.4.5. Destination User Part Unavailable (DUPU)
The DUPU message is used by an SG to inform an ASP that a remote peer
at an SS7 node is unavailable.
The format for DUPU message parameters is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0012 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Affected Point Code /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x010C | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| User/Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\ \
/ INFO String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Optional
Affected Point Code Mandatory *1
User/Cause Mandatory
Info String Optional
Note 1: The DUPU corresponds to the SCCP N-PCSTATE primitive.
3.4.6. Destination Restricted (DRST)
The DRST message is optionally sent from the SG to all concerned ASPs
to indicate that the SG has determined that one or more destinations
are now restricted from the point of view of the SG, or in response
to a DAUD message if appropriate. The SUA layer at the ASP is
Loughney, et al. Standards Track [Page 47]
RFC 3868 SUA October 2004
expected to send traffic to the affected destination via an alternate
SG of equal priority, but only if such an alternate route exists and
is available. If the ASP currently considers the affected
destination unavailable, the peer should be informed that traffic to
the affected destination could be resumed. In this case, the SUA
layer should route the traffic through the SG initiating the DRST
message.
This message is optional for the SG to send and it is optional for
the ASP to act on any information received in the message.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0012 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Affected Point Code /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x8003 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0112 | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | SMI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Routing Context Optional
Affected Point Code Mandatory *1
SSN Optional *1
SMI Optional *1
Info String Optional
Note 1: The Affected Point Code refers to the node to which
become restricted or which has requested coordinated
service outage. When SSN is included in the message
Loughney, et al. Standards Track [Page 48]
RFC 3868 SUA October 2004
parameter, the DRST message corresponds to the SCCP
N-COORD primitive. If the SMI parameter is also included
in the message, the DRST message corresponds to the
N-COORD Request and N-COORD Indication primitives,
otherwise, the DRST message correspondence to the N-COORD
Response and N-COORD Confirm primitives. The Affected
Point Code can only contain one point code when SSN is
present. When SSN is not present, DRST corresponds to
N-PCSTATE primitive.
3.5. Application Server Process State Maintenance Messages
3.5.1. ASP Up (UP)
The ASP UP (UP) message is used to indicate to a remote SUA peer that
the Adaptation layer is up and running.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0011 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ASP Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
ASP Identifier Optional *1
Info String Optional
Note 1: ASP Identifier MUST be used where the IPSP/SGP cannot
identify the ASP by provisioned address/port number
information (e.g., where an ASP is resident on a Host
using dynamic address/port number assignment).
Loughney, et al. Standards Track [Page 49]
RFC 3868 SUA October 2004
3.5.2. ASP Up Ack (UP ACK)
The ASP UP Ack message is used to acknowledge an ASP-Up message
received from a remote SUA peer.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Info String Optional
3.5.3. ASP Down (DOWN)
The ASP Down (DOWN) message is used to indicate to a remote SUA peer
that the adaptation layer is not running.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Info String Optional
Loughney, et al. Standards Track [Page 50]
RFC 3868 SUA October 2004
3.5.4. ASP Down Ack (DOWN ACK)
The ASP DOWN Ack message is used to acknowledge an ASP-Down message
received from a remote SUA peer.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Info String Optional
Note: ASP DOWN ACK will always be sent to acknowledge an ASP DOWN.
3.5.5. Heartbeat (BEAT)
The Heartbeat message is optionally used to ensure that the SUA peers
are still available to each other.
The format for the BEAT message is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0009 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Heartbeat Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Heartbeat Data Optional
Loughney, et al. Standards Track [Page 51]
RFC 3868 SUA October 2004
3.5.6. Heartbeat Ack (BEAT ACK)
The Heartbeat ACK message is sent in response to a BEAT message. A
peer MUST send a BEAT ACK in response to a BEAT message. It includes
all the parameters of the received Heartbeat message, without any
change.
The format for the BEAT ACK message is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0009 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Heartbeat Data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Parameters
Heartbeat Data Optional
Loughney, et al. Standards Track [Page 52]
RFC 3868 SUA October 2004
3.6. ASP Traffic Maintenance Messages
3.6.1. ASP Active (ACTIVE)
The ASPAC message is sent by an ASP to indicate to a remote SUA peer
that it is Active and ready to process signalling traffic for a
particular Application Server.
The format for the ACTIVE message is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x000B | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Traffic Mode Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0006 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0110 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TID Label |
+-------------------------------+-------------------------------+
| Tag = 0x010F | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DRN Label |
+-------------------------------+-------------------------------+
| Tag = 0x0004 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |
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