Emergency Services for Internet Telephony Systems

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Last updated 2004-10-25
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Summoning emergency help is a core feature of telephone networks. This document describes how the Session Initiation Protocol (SIP) can be used to provide advanced emergency services for voice-over-IP (VoIP). The architecture employs standard SIP features and requires no new protocol mechanisms. DNS is used to map civil and geospatial locations to the appropriate emergency call center.


Henning Schulzrinne (hgs+geopriv@cs.columbia.edu)
Brian Rosen (brian.rosen@marconi.com)

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