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ETSI EN 300 172
- Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Circuit-mode basic services [ISO/IEC 11572 (1996) modified]
- standard by European Telecommunications Standards Institute, 09/01/1997
- Publisher: ETSI
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This European Telecommunication Standard (ETS) defines the layer 3 protocol for signalling for the support of circuit-mode bearer services (used either on their own or in support of teleservices) at the Q reference point between Private Integrated services Network eXchanges (PINX) connected together within a Private Integrated Services Network (PISN). The Q reference point is defined in ETS 300 475-1.