[SR-Users] CANCEL is not forwarded, if callee does not respond

[Klaus Darilion]

This behavior is standard conform. The proxy must not forward the CANCEL 
as it has not received a response to the INVITE yet. Further, the INVITE 
transaction will be terminated only after the outgoing INVITE is 
terminated, e.g. by the 408 timeout.

Usually you do not want to wait 30 seconds for the timeout to happen. I 
for example limit it to 5 seconds using fr_timer:

http://kamailio.org/docs/modules/3.2.x/modules/tm.html#fr_timer

There are lots of other paramters to tweak tm module, e.g.:
http://kamailio.org/docs/modules/3.2.x/modules/tm.html#cancel_b_method

But the default settings are usually fine.

regards
Klaus


On 04.11.2011 14:06, Mino Haluz wrote:
> Hi,
>
> the scenario is like this:
>
> - user1 makes a call to user2
> - proxy sends receives INVITE and sends it to user2
> - user2 does not respond at all (firewall for example)
> - user1 after 5 seconds hangs up the call with CANCEL
> - proxy sends to user1 200 canceling
>
> CANCEL is not forwarded to user2. Ok this behaviour is maybe ok, but
> after 30 seconds Request timed out is sent to user1 (fr_inv_timer
> possibly hit). So if I am thinking well, first CANCEL did not match the
> transaction ? Why ? It this behaviour ok or do I have to search for
> something wrong in the config?
>
> Thanks,
> Mino
>
>
>
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