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ETSI ETS 300 055-1

Integrated Services Digital Network (ISDN); Terminal Portability (TP) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 10/01/1991
Publisher: ETSI

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ISDN User-Network Layer 3 Signalling Protocols for Supplementary Services

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