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.