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ETSI ETS 300 359-1

Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 11/01/1995
Publisher: ETSI

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ISDN User-Network Layer 3 Signalling Protocols for Supplementary Services

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