Thanks for the info - I've updated the docs.
regards klaus
Christian Schlatter wrote:
Klaus Darilion wrote:
Hi Christian!
Is the behavior identically for all transactions or is there a difference between INVITE and other transactions?
- INVITE transactions: FRT initially equals fr_timer and gets set to
fr_inv_timer after receiving first provisional response
This is only true for INVITE transactions, all other transactions only use the fr_timer. This makes sense since INVITE transactions normally involve user interaction (ringing).
The code responsible for that is in /modules/tm/t_reply.c, reply_received(..) function:
/* update FR/RETR timers on provisional replies */ if (msg_status < 200 && (restart_fr_on_each_reply || ((last_uac_status<msg_status) && ((msg_status >= 180) || (last_uac_status == 0))) ) ) { /* provisional now */ if (is_invite(t)) { /* invite: change FR to longer FR_INV, do not * attempt to restart retransmission any more */ backup_list = set_avp_list(&t->user_avps); if (!fr_inv_avp2timer(&timer)) { DBG("DEBUG:tm:reply_received: FR_INV_TIMER = %d\n", timer); set_timer(&uac->request.fr_timer, FR_INV_TIMER_LIST, &timer); t->flags |= T_NOISY_CTIMER_FLAG; } else { set_timer(& uac->request.fr_timer, FR_INV_TIMER_LIST, 0); } set_avp_list(backup_list); } else { /* non-invite: restart retransmissions (slow now) */ uac->request.retr_list = RT_T2; set_timer(&uac->request.retr_timer, RT_T2, 0); } } /* provisional replies */
- Christian
regards klaus
Christian Schlatter wrote:
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 klaus.mailinglists@pernau.at 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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