This Standard specifies the additional signalling protocol requirements for the support of interactions between supplementary services at the Q reference point between Private Telecommunication Network Exchanges (PTNXs) connected together within a Private Telecommunication Network (PTN).
The Q reference point is defined in ECMA-133.
Service specifications are produced in three stages and according to the method specified in ENV 41005. This Standard contains the stage 3 specification for the Q reference point for the interactions between supplementary services.
For a given pair of supplementary services, this Standard specifies the impact of interactions, if any, on the signaling protocol at the Q reference point. The protocol for each individual supplementary service is specified in a separate standard, operates in addition to the signalling protocol for basic circuit switched call control, as specified in ECMA- 143, and uses certain aspects of the generic functional protocol for the control of supplementary services specified in ECMA-165.
NOTE 1 – Additional interactions that have no impact on the signalling protocol at the Q reference point can be found in the relevant stage1 specifications.
This Standard also specifies interactions between Additional Network Features (ANFs) and between ANFs and supplementary services.
This Standard is applicable to PTNXs which can be interconnected to form a PTN and which support signaling protocols at the Q reference point for two or more supplementary services.