This International Standard defines the signalling procedures and protocol for the purpose of circuit-switched Call Control at the Q-reference point between Private Integrated Network Exchanges (PINXs) connected together within a Private Integrated Services Network (PISN).
The Q reference point is defined in ISO/IEC 11579-1.
This International Standard is based upon that described in ITU- T Recommendation Q.931, including the provisions for symmetrical operation described in annex D of that recommendation.
Service specifications are produced in three stages and according to the method specified in ETS 300 387. This International Standard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ECMA-142, ECMA-148 and ISO/IEC 11584.
This International Standard is applicable to PINXs which interconnect to form a PISN.
Annex ZC is an integral part of this International Standard.
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Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Circuit Mode Bearer Services - Inter-Exchange Signalling Procedures and Protocol (Adopted ISO/IEC 11572:1994)