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ETSI ETS 300 188-1

Integrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 08/01/1993
Publisher: ETSI

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Layer 3 ISDN D-channel signalling procedures for control of Three Party supplementary service

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