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ETSI ETS 300 210-1
- Integrated Services Digital Network (ISDN); Freephone (FPH) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
- standard by European Telecommunications Standards Institute, 02/01/1996
- Publisher: ETSI
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ISDN User-Network Layer 3 Signalling Protocols for Supplementary Services