EN 300 172 : 1.5.1
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Defines 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 explained in ETS 300 475-1.
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