scope:

This European Telecommunication Standard (ETS) contains the Abstract Test Suite (ATS) specification for the core part of the Generic Functional Protocol (GFP) for the support of supplementary services of the Inter-exchange signalling protocol, for Private Integrated Services Networks (PISN). The core part of the GFP excludes the connectionless Application Packet Data Unit (APDU) transport mechanism, the Data Service Element (DSE) protocol, the Application Control Service Element (ACSE) protocol, procedures for carrying manufacturer specific information and requirements only relevant to Originating PINXs for calls and Call Independent Signalling Connections (CISCs) or source PINXs for APDUs and notifications.