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ATIS 1000118

1992 Edition, September 1992

Complete Document

Signalling System Number 7 (SS7) – Intermediate Signalling Network Identification (ISNI)

Includes all amendments and changes through Reaffirmation Notice , 1992


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Description / Abstract:

Scope, purpose, and application

The Intermediate Signalling Network Identification (ISNI) capability allows an application process in the origination network to specify intermediate signalling network(s) for non-circuit-associated signalling messages, or to notify an application process in the destination network about such intermediate signalling network(s), or to do both. ISNI may be invoked by a variety of services.

The end user can interact with an end user service that may invoke the ISNI capability. The specific end user service that invokes ISNI is not within the scope of this capability description. The ISNI capability is therefore not visible to the end user, but allows an end user service to take place. Thus, there is a "layering" of services and capabilities, and the visible end user services may need the ISNI capability to complete. The specification of the intermediate signalling networks or the decision to request that the application process in the destination network be notified about the intermediate networks may be determined by end users or networks.