ECMA-233

This Standard specifies the signalling protocol for the support of the Cordless Terminal Outgoing Call additional network feature (ANFCTMO) at the Q reference point between Private Integrated Services Network Exchanges (PINX) connected together within a Private Integrated Services Network (PISN).

ANF-CTMO permits the PISN to process call requests from a CTM user at the home location, if required.

The Q reference point is defined in ISO/IEC 11579-1.

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 (concerning ANF-CTMO) identified by the stage 1 and stage 2 specifications in ETS 300 694 and ETS 300 695, respectively.

The signalling protocol for ANF-CTMO 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 ANFCTMO and other supplementary services and ANFs.

NOTE 1 – Additional interactions that have no impact on the signalling protocol at the Q reference point can be found in the relevant stage 1 specifications.

This Standard is applicable to PINXs which can interconnect to form a PISN.