ISUP - ISDN User Part (ISUP)

This is the Signalling System No. 7 (SS7) Integrated Services Digital Network (ISDN) User Part (ISUP) component of the OpenSS7 stack. This component implements ISUP functions in a STREAMS multiplexing driver.

Originally it was believed that the ISUP component would be more properly placed in user-space; however, the current implementation implements the entire ISUP call control and signalling functions in the kernel in a STREAMS multiplexing driver.

The ISUP STREAMS driver provides a Call Control Interface (CCI).

An additional ISUP management interface is provided to allow for Continuity Testing and Test Calls as well as circuit management (blocking, unblocking) capabilities.

The ISUP STREAMS driver supports I_LINK and I_PLINK of Message Transfer Part Interface (MTPI) streams providing SS7 MTP-SAPs under the multiplexing driver.

The ISUP component was started in January 2000.

The ISUP component is in the Maintenance stage.

This component depends on the SS7 MTP Level 3, SIGTRAN M3UA or TALI driver and the Message Transfer Part Interface (MTPI).

Designs for the ISUP component will be available here.

Documentation for ISUP will be available here.

The following preliminary manual pages will be available: isup(4), ISUP driver manpage; isupi(4), ISUPI interface manpage; cci_isup(7), ISUP CCI interface manpage; isup_ioctl(4), ISUP IO Controls; isup(8), ISUP administration.

Test results have not yet been released to the public. Test programs and results for Q.784 conformance tests are available on the OpenSS7 CVS archive in the directory /openss7/strss7/test. The ISUP component test programs and results will be released with the next major release of the strss7 package.

Preliminary PICS and PIXIT Proforma for ISUP will be available here.

A reference list for the ISUP component can be viewed here.

Code has not yet been released to the public. Source code is available on the OpenSS7 CVS archive under the subdirectory /strss7/src/modules/isupi. The ISUP component code will be publicly released with the next major release of the strss7 package.

The Integrated Serviced Digital Network (ISDN) User Part (ISUP) is an integral part of the OpenSS7 STREAMS SS7 stack and can be found in the isupi sub-directory in the strss7 release code. Please see the Downloads Page for more information.