Connected Identity in the Session Initiation Protocol (SIP)

Document Type Replaced Internet-Draft (individual)
Last updated 2008-03-17 (latest revision 2006-02-22)
Replaced by draft-ietf-sip-connected-identity
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Because of retargeting of a dialog-forming request, the UAS can have a different identity from that in the To header. This document provides a means for that UA to supply its identity to the peer UA by means of a request in the reverse direction and for that identity to be signed by an authentication service. The same mechanism can be used to indicate a change of identity during a dialog, e.g., because of some action in a PSTN behind a gateway. This work is being discussed on the mailing list.


John Elwell (

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