[Sip-implementors] Question on handling CANCEL requests in proxy

[Straulino Heiko ICM N MC MI E72]

Hi all,

i have a question regarding the handling of a CANCEL request in a SIP proxy
in the following
situation: 
A proxy server receives an INVITE request. The request is processed
internally
(e.g. location server lookup, etc.). Before internal processing of the
INVITE is finished (and before the INVITE is forwarded)
a CANCEL request for the INVITE arrives. Now should the proxy:

a) Stop INVITE processing and return a 487 "Request terminated" for the
INVITE transaction.
b) Nevertheless forward the INVITE request and send a CANCEL right behind.

The -bis03 draft reads as if 487 is only generated by user agents or
redirect servers, which sounds
like solution (b).

Thanks in advance,

Heiko Straulino
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