scope:

Scope and purpose

This standard contains the specifications of two supplementary services: Calling Line Identification Presentation (CLIP), and Calling Line Identification Restriction (CLIR). The associated switching and signaling specifications are also provided.

CLIP is a supplementary service offered to a called party that provides the Calling Line Identification to that called party. The CLI information may not include the calling party's number due to interworking, or because of an interaction with the CLIR supplementary service.

CLIR is a supplementary service offered to a calling party that restricts presentation of that party's Calling Line Identification to the called party.

The purpose of this standard is to allow maximum compatibility among public- and user- owned telecommunications equipment. This standard is one of a series that defines and describes supplementary services within the context of an Integrated Services Digital Network (ISDN). The standard also includes a description of the interaction of CLIP and CLIR with other T1 standards. The CLIP and CLIR supplementary services may be provided on a subscription basis or they may be made generally available.