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ETSI ETS 300 257
- Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Diversion supplementary services [ISO/IEC 13873 (1995) modified]
- standard by European Telecommunications Standards Institute, 11/01/1995
- Publisher: ETSI
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This European Telecommunication Standard (ETS) specifies the signalling protocol for the support of Call Diversion supplementary services (SS-DIV) at the Q reference point between Private Telecommunication Network eXchanges (PTNX) connected together within a Private Telecommunication Network (PTN). The Call Diversion supplementary services are Calling Forwarding Unconditional (SS-CFU), Call Forwarding Busy (SS-CFB), Call Forwarding No Reply (SS-CFNR) and Call Deflection (SS-CD).
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