ETSI ETS 300 438-1

Broadband Integrated Services Digital Network (B-ISDN); Signalling ATM Adaptation Layer (SAAL); Service Specific Co-Ordination Function (SSCF) for Support of Signalling at the Network Node Interface (NNI) Part 1: Spec. of SSCF at NNI (ITU-T RECMN Q.2140 (1995), Modified)