[Users] provisional_reply_timer

[Christian Schlatter]

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 at 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
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at openser.org
>> http://openser.org/cgi-bin/mailman/listinfo/users
>>
> 
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> Users at openser.org
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