%% You should probably cite rfc3329 instead of this I-D. @techreport{ietf-sip-sec-agree-05, number = {draft-ietf-sip-sec-agree-05}, 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-sec-agree/05/}, author = {Gonzalo Camarillo and Vesa Torvinen and Jari Arkko and Aki Niemi and Tao Haukka}, title = {{Security Mechanism Agreement for the Session Initiation Protocol (SIP)}}, pagetotal = 24, year = 2002, month = nov, day = 1, abstract = {This document defines new functionality for negotiating the security mechanisms used between a Session Initiation Protocol (SIP) user agent and its next-hop SIP entity. This new functionality supplements the existing methods of choosing security mechanisms between SIP entities.}, }