scope:

This standard specifies the stage three of the Calling Line Identification Presentation (CLIP) supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operator at the T reference point or coincident S and T reference point (as defined in CCITT Recommendation 1.411 [1]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol Stage three identifies the protocol procedures and switching functions needed to support a telecommunication service (see CCITT Recommendation 1.130[2]).

In addition this standard specifies the protocol requirements at the T reference point where the service is provided to the user via a private ISDN.

This standard does not specify the additional protocol requirements where the service is provided to the user via telecommunications network that is not an ISDN.

The CLIP supplementary service provides the called party with the possibility to receive identification of the calling party and is applicable to all telecommunication services.

Further part of this standard will specify the method of testing required to identify conformance to this standard.

This standard is applicable to equipment supporting the CLIP supplementary service, to be attachment at either side of a T reference point or coinodent S ad T reference point when used as an access to the public ISDN.