Ovidiu Sas wrote:
Hi Klaus,

You can use the fr_timer from the tm module:
http://openser.org/docs/modules/1.1.x/tm.html#AEN108

If you don't get any reply from the far end, this timer will fire.

I recently had a look at the timer related source code and that is what I wrote down:

- Each SIP transaction has a final response timer (FRT)

- SIP transactions fail (failure_route, status 408) when FRT fires

- TM module exposes final response timers (FRT) fr_timer and fr_inv_timer (can be set using AVP)

- INVITE transactions: FRT initially equals fr_timer and gets set to fr_inv_timer after receiving first provisional response

- setting fr_timer to a low value (e.g. 3s) allows for fast INVITE failover

So I'm setting fr_timer to a low value for local INVITE transactions. Local here means sessions between endpoints from our network domain. Something along the lines:

route[0] {
        if (method==“INVITE”) {
                # set fr_timer to 3 seconds
                avp_write("i:3", "$avp(fr_timer)");
                # call FAILURE_DEFAULT_RELAY routing block on transaction 
failure
                t_on_failure("FAILURE_DEFAULT_RELAY");
                t_relay();
                exit;   
        }
}
failure_route[FAILURE_DEFAULT_RELAY] {
        # status 408 ? transaction timed out
        if (t_check_status("408")) {
                # try next target
                if (ds_next_domain()) {
                        t_relay();
                }
        }
}


- Christian



Regards,
Ovidiu Sas

On 12/18/06, Klaus Darilion <[EMAIL PROTECTED]> wrote:
Hi!

i wonder if there is a timer which controls the timeout for provisional
replies.

E.g. I want to cancel an INVITE and retry another gateway if the gateway
does not respond with 100 (or 180) in a certain time.

regards
klaus

--
Klaus Darilion
nic.at


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