%% You should probably cite draft-ietf-ecrit-service-urn instead of this I-D. @techreport{ietf-sipping-sos-02, number = {draft-ietf-sipping-sos-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-sipping-sos/02/}, author = {Henning Schulzrinne}, title = {{Emergency Services URI for the Session Initiation Protocol}}, pagetotal = 11, year = 2006, month = jan, day = 30, abstract = {As part of an overall architecture for supporting emergency calling for the Session Initiation Protocol (SIP), this document defines universal emergency SIP URIs, sip:sos@domain and sips:sos@domain, that allows SIP user agents to contact the local emergency call center. It also defines conventions that increase the high probability of reaching the appropriate emergency call center. The document does not define any SIP protocol extensions.}, }