This Recommendation specifies the protocol description of the originating identification presentation (OIP) and the originating identification restriction (OIR) supplementary services, based on the requirements and architecture of the ISDN CLIP and CLIR supplementary service. This document provides the protocol details in the NGN service control based on session initiation protocol (SIP).

NOTE – It can be noted that the behaviour described in this Recommendation does not take into account other behaviours that are specified in other applications, and care needs to be taken when designing the filters (for example) when two or more applications are involved in a session.