An Extension to the Session Initiation Protocol for Request History Information

Document Type Expired Internet-Draft (individual)
Author Mary Barnes 
Last updated 2003-02-11 (latest revision 2002-12-20)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This draft defines a standard mechanism for capturing the history information associated with a 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 draft defines a new optional SIP header, History-Info, for capturing the history information in requests. A new option tag, HistInfo, to be included in the Supported header is defined to allow UAs to indicate whether the HistInfo should be returned in responses to a request which has captured the history information.


Mary Barnes (

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