scope:

This ECMA Standard specifies the signalling protocol for the support of Identification supplementary services at an interface at the S reference point between a Terminal Equipment (TE) and a Private Telecommunication Network (PTN). The identification supplementary services concerned are Supplementary Service Calling line Identification Presentation (SS-CLIP), Supplementary Service Connected Line Identification Presentation (SS-COLP) and Supplementary Service Calling / Connected Line Identification Restriction (SS-CLIR).

A PTN consists of one or more interconnected Private Telecommunication Network Exchanges (PTNX), and therefore an Interface at the S reference point is actually between a TE and a PTNX. The S reference point is defined in Standard ECMA-133. Other ECMA Standards will define protocols for use at other reference points, notably the Q reference point between two Interconnected PTNXs within a PTN.

Service specifications are produced in three stages and according to the method specified in ENV 41005. This Standard is an output from stage 3, the definition of signalling protocols, and therefore satisfies the requirements identified by the stage 1 and stage 2 specifications in Standard ECMA-148. This Standard is applicable to user accesses of PTNXS and to TEs which are intended for connection to PTNs.

The impact on the protocol of interactions between the supplementary services specified in this Standard and other supplementary services is outside the scope of this Standard.