An Extension to the Session Initiation Protocol (SIP) for Request History Information

Document Type Replaced Internet-Draft (individual)
Last updated 2010-04-09 (latest revision 2009-10-26)
Replaced by draft-ietf-sipcore-rfc4244bis
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines a standard mechanism for capturing the history information associated with a Session Initiation Protocol (SIP) request. This capability enables many enhanced services by providing the information as to how and why a call arrives at a specific application or user. This document defines an optional SIP header, History-Info, for capturing the history information in requests.


Mary Barnes (
Francois Audet (
Shida Schubert (
Hans van Elburg (
Christer Holmberg (

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