Emergency Services for Internet Telephony based on the Session Initiation Protocol (SIP)

Document Type Expired Internet-Draft (individual)
Author Henning Schulzrinne 
Last updated 2003-01-08
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes how Session Initiation Protocol (SIP) user agents and proxies can set up emergency calls and, more generally, reach emergency assistance via SIP requests. For that purpose, it defines a universal emergency SIP URI, sip:sos@domain and sips:sos@domain, that allows SIP user agents to contact the local emergency number. 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.


Henning Schulzrinne (hgs+geopriv@cs.columbia.edu)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)