2009/2/9 Avasarala Ranjit-A20990 <[email protected]>:
> 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 forward the CANCEL request that contains 
> Reason header.

Great! Thanks for pointing it out.

-- 
Iñaki Baz Castillo
<[email protected]>

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