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ETSI ETS 300 661-1
- Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Direct Dialling In (DDI) supplementary service; Part 1: Protocol specification [ITU-T Recommendation Q.2951, clause 1 (1995), modified]
- standard by European Telecommunications Standards Institute, 07/01/1997
- Publisher: ETSI
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B-ISDN UNI layer 3 signalling protocol for supplementary services, B-I SDN CS1
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