Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the Open Mobile Alliance (OMA) Push to talk over Cellular (PoC)
Research in Motion
This document describes a set of private Session Initiation Protocol(SIP) headers (P-headers) used by the Open Mobile Alliance (OMA),For Push to talk over Cellular (PoC) along with their applicability, which is limited to the OMA PoC application. The P-headers are used for requesting and indicating the alerting mode of the handset which is particular to the PoC application.