H225

Section: OpenSS7 STREAMS VOIP Devices (4)
Updated: 2008-10-31
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NAME

H225 - H.225.0 Call Control

SYNOPSIS

#include <ss7/cci.h>
#include <ss7/h225i.h>
#include <ss7/h225i_ioctl.h>

int h225_stream = open(device, flags);

DESCRIPTION

H225
is an implementation of the H.225.0 Call control defined in ITU-T Recommendation H.225.0. H225 is based on ITU-T Recommendation Q.931 (see isdn(4)). H225 uses the services of TCP (see tcp(4)) or SCTP (see sctp(4)) or other reliable transport providing a tpi(7) interface.

H225 is implemented as a STREAMS(4) multiplexing driver. tcp(4), sctp(4) or sscop(4) transport provider streasm are linked under the H225 multiplexing driver using the I_LINK or I_PLINK commands of streamio(7), to provide reliable transport services to H225. Once linked, the streams must be configured using h225_ioctl(4) IO controls. This function is normally performed by the H323 configuration daemon, h323confd(8). See also, h225(8).

H225 provides the following stream types. To select one of the stream types, the device argument to the open(2) call can be one of the following:

/dev/h225: This device provides the H225 protocol services interface using the CC-primitives of the Call Control Interface (CCI) described in cci(7), as interpreted for use with H225 as described in cci_h225(7). This interface is suitable both for use with other SS7/ISDN modules and drivers, as well as with the cframe(3) library using the OpenSwitch call framework.

Unlike other communications protocol modules and drivers, H225 does not provide an xti(3) or sockets(3) interface. This is because the special needs of call control are divorced from the XTI or SOCKETS paradigm.

IOCTLS

All interfaces support a set of management IO controls using ioctl(2) system calls on the h225_stream file descriptor. These management controls are documented in h225_ioctl(4).

FILES

<ss7/cci.h>, <ss7/h225i.h>, <ss7/h225i_ioctl.h>, <ss7/cframe_h225.h>.

DEVICES

/dev/h225

VERSIONS

The H225 interface is specific to the OpenSS7 SS7 stack. This is Version 2 of the interface.

CCI interfaces are consistent with CCI Revision 0.8.2.

REFERENCES

[1]: ITU-T Recommendation H.225.0, Media Stream Packetization and Synchronization on Non-Guaranteed Quality of Service LANs, November 1996, (Geneva), ITU, ITU-T Telecommunication Standardization Sector of ITU. (Previously "CCITT Recommendation") <http://www.itu.int/rec/T-REC-H.225/>
[2]: ITU-T Recommendation H.323, Packet-Based Multimedia Communications Systems, February 1998, (Geneva), ITU, ITU-T Telecommunication Standardization Sector of ITU. (Previously "CCITT Recommendation") <http://www.itu.int/rec/T-REC-H.323/>

TRADEMARKS

OpenSS7tm: is a trademark of OpenSS7 Corporation.
Linux®: is a registered trademark of Linus Torvalds.
UNIX®: is a registered trademark of The Open Group.
Solaris®: is a registered trademark of Sun Microsystems.

Other trademarks are the property of their respective owners.

IDENTIFICATION

OpenSS7 STREAMS VOIP: Package strvoip version 0.9.2.4 released 2008-10-31.

This document was created by man2html, using the manual pages.
Time: 11:38:49 GMT, May 24, 2013

Description: Manual Page

Keywords: ss7 ss7/ip ss7 over ip ss7 mtp ss7 sccp ss7 tcap sigtran mtp sccp tcap openss7 acb56 linux telephony pstn linux telephony linux nebs linux compactpci