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Standard ECMA-174 
This Standard specifies the signalling protocol for the support of Call Diversion supplementary services (SS-DIV) at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). The Call Diversion supplementary services are Call Forwarding Unconditional (SS-CFU), Call Forwarding Busy (SS-CFB), Call Forwarding No Reply (SS-CFNR) and Call Deflection (SS-CD). SS-CFU, SS-CFB, SS-CFNR and SS-CD are supplementary services which permit a served user to have the PISN send all or specific incoming calls addressed to the served user's PISN number to another number. The Q reference point is defined in ECMA-133. Service specifications are produced in three stages and according to the method specified in ETS 300 387. This 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-173. The signalling protocol for SS-DIV operates on top of the signalling protocol for basic circuit switched call control, as specified in ECMA-143 and uses certain aspects of the generic procedures for the control of supplementary services specified in ECMA-165. This Standard also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between SS-DIV and other supplementary services and ANFs. This Standard is applicable to PINXs which can be interconnected to form a PISN. The protocol defined in this Standard forms part of the PSS1 protocol (informally known as QSIG).
The following file can be freely downloaded:
This Ecma publication is also approved as ISO/IEC 13873. The previous replaced "historical" edition of this Ecma Standard is available here.
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