SSH EN 300 899-1 V1.1.2:1998

Integrated Services Digital Network (ISDN);Signalling System No.7;Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1);Part 1: Protocol specification [ITU-T Recommendation Q.699, modified]

Scope

This first part of ETS 300 899 specifies the interworking between Signalling System No.7 ISDN User Part (ISUP) version 2 as specified in [19] to [36] and Digital Subscriber Signalling System No. one (DSS1) as specified in [1] to [18] and [37] to [39]. The interworking between subsequent versions of the ISUP signalling protocol (ISUP version 3, etc.) and the DSS1 protocol shall be in accordance with the requirements as contained in this ETS unless explicitly specified otherwise in subsequent versions of the ISUP signalling protocol. This also applies to new services specified in the DSS1 signalling protocol (e.g. the Selective Call Forwarding services) that make use of the existing procedures in the ISUP protocol The interworking between the above signalling protocols occurs in an exchange with ISDN local exchange functionality
and is specified in the context of a typical call in a pure ISDN or mixed ISDN/non-ISDN environment. In case of contradictions between the mapping described in the present document and the requirements specified in the corresponding ISUP and DSS1 standards, the procedures in the ISUP and DSS1 standards apply.