scope:

This standard is aimed at defining the interworking relationship between the call control protocol of the ISDN User-Network Interface Protocol and the ISDN User Part of SS7.

This standard defines in detail the relationship between signalling information conveyed via the User- Network Interface Protocol and similar signalling information conveyed via the ISDN User Part of SS7. The above relationship is described within the context of supporting the establishment and clearing of a call within an ISDN or mixed ISDN/non-ISDN environment.

NOTE - Although sufficient information is included in this standard to allow implementation of the interworking functionality, not all possible combinations of interworking scenarios are documented explicitly.

Purpose

The purpose of this standard is

To define how the ISDN User-Network Interface Protocol and SS7 ISDN User Part protocols should be used in combination with call control functions, to support the circuit mode bearer service defined in ANSI T1.620;

To provide a logical bridge between the abstract signalling information flows, which are used in the description of ISDN services, and the corresponding messages and elements of procedure of the ISDN access and network signalling systems.