On Friday 30 April 2010, Iñaki Baz Castillo wrote:
> [..]
> Not exactly, sorry, the proxy should forward the CANCEL stateless:
>
> 16.10 CANCEL Processing
> [...]
> If a response context is not found, the element does not have any
> knowledge of the request to apply the CANCEL to. It MUST statelessly
> forward the CANCEL request (it may have statelessly forwarded the
> associated request previously).
>
Hi Iñaki,
ok, but i think in the default server configuration we don't do it this way:
if (is_method("CANCEL"))
{
if (t_check_trans())
t_relay();
exit;
}
We just drop them. In the sr configuration i think there is also a similar
method implemented (etc/sip-router.cfg, route[CATCH_CANCEL]). In the past on
our systems we've tried to forward them stateless, but this created some loop
conditions, if i remember correctly. Sending a final response to the CANCEL
(e.g. 491) also not worked out really well.
Henning
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