scope:

The present document describes the additions to the ISDN User Part (ISUP) for providing a transport mechanism used by applications requiring a bearer in conjunction with the support of the application's signalling information flow. It specifies the Application Transport Mechanism (APM) for the pan-European Integrated Services Digital Network (ISDN) as provided by the European public telecommunications operators. This transport mechanism shall provide the same capabilities as the Transaction Capabilities Application Part (TCAP) provides to its users. The definition of the applications that use this mechanism are documented in their own specification and are therefore outside the scope of the present document.