%% You should probably cite rfc3261 instead of this I-D. @techreport{ietf-sip-rfc2543bis-09, number = {draft-ietf-sip-rfc2543bis-09}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-sip-rfc2543bis/09/}, author = {Eve Schooler and Jonathan Rosenberg and Henning Schulzrinne and Alan Johnston and Gonzalo Camarillo and Jon Peterson and Robert Sparks and Mark J. Handley}, title = {{SIP: Session Initiation Protocol}}, pagetotal = 269, year = 2002, month = feb, day = 28, abstract = {This document describes Session Initiation Protocol (SIP), an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences. {[}STANDARDS-TRACK{]}}, }