[Kamailio-Devel] [ openser-Feature Requests-2581449 ] Support for RFC 3326 (respect "Reason" header in CANCEL)

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Feature Requests item #2581449, was opened at 2009-02-09 13:46
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Category: core
Group: ver devel
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Iñaki Baz (ibc_sf)
Assigned to: Nobody/Anonymous (nobody)
Summary: Support for RFC 3326 (respect "Reason" header in CANCEL)

Initial Comment:
Section 2 of RFC 3326 says:

  Proxies generating a CANCEL request upon reception of a CANCEL from
  the previous hop that contains a Reason header field SHOULD copy it
  into the new CANCEL request.

  In normal SIP operation, a SIP status code in a response provides the
  client with information about the request that triggered the
  response, the session parameters, or the user.  For example, a 405
  (Method not allowed) response indicates that the request contained an
  unsupported method.  A 488 (Not Acceptable Here) indicates that the
  session parameters are unacceptable and a 486 (Busy Here) provides
  information about the status of the user.


So this means that Proxies SHOULD include the "Reason" header in its CANCEL if it receives a CANCEL containing it.

This would be very useful in big SIP environments involving various proxies.

Another different subject would be Kamailio adding by itself a "Reason" header to inform the cancelled branches about the reason of the cancellation (ie, "Call answered elsewhere"). But this is a different and independent wish/feature.


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