%% You should probably cite draft-allen-sipping-poc-p-answer-state-header instead of this I-D. @techreport{allen-sipping-poc-p-headers-01, number = {draft-allen-sipping-poc-p-headers-01}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-allen-sipping-poc-p-headers/01/}, author = {Andrew Allen}, title = {{Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the Open Mobile Alliance (OMA) Push to talk over Cellular (PoC)}}, pagetotal = 20, year = 2005, month = feb, day = 8, abstract = {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.}, }