%% You should probably cite rfc5768 instead of this I-D. @techreport{ietf-sip-ice-option-tag-02, number = {draft-ietf-sip-ice-option-tag-02}, 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-ice-option-tag/02/}, author = {Jonathan Rosenberg}, title = {{Indicating Support for Interactive Connectivity Establishment (ICE) in the Session Initiation Protocol (SIP)}}, pagetotal = 6, year = 2007, month = jun, day = 19, abstract = {This specification defines a media feature tag and an option tag for use with the Session Initiation Protocol (SIP). The media feature tag allows a User Agent (UA) to communicate to its registrar that it supports ICE. The option tag allows a UA to require support for ICE in order for a call to proceed. {[}STANDARDS-TRACK{]}}, }