[Kamailio-Users] [Bulk] Re: [Kamailio-Devel] drop() and tm timers.

[Aurelien Grimaud]

Daniel-Constantin Mierla a écrit :
>
>
> On 12/19/08 10:10, Aurelien Grimaud wrote:
>> Klaus Darilion a écrit :
>>  
>>> Strange!
>>>
>>> Nevertheless there is no need to drop 100 as 100 is never relayed.
>>>     
>> Yep, my mistake !
>>
>> The first destination chosen for serial forking was sending a 101 
>> with sdp, which was relayed to caller.
>>   
> 101 - I haven't heard of such reply so far ... what is the reason phrase?
Well, this is a home made reply from a pstn gateway.
The pstn gateway sens request to a pstn network equipement.
As soon as the pstn equipements answers a Progress, a 101 is relayed to 
openser.
It contains really early sdp.
I thought it smart.
I am not so sure now !

Aurelien
>
>> But this first destinaion failed to establish the call, so the 
>> request was serial forked to another destination, sending another 101 
>> sdp, then 180 sdp and 200 sdp which are relayed to caller.
>> The problem is that caller did not take into account the next sdp but 
>> stay stucked to initial one (the one that failed).
>>
>> When tm timer triggers, there is a CANCEL which is sent to initial 
>> destination right ?
>>   
> Yes.
>
>> Well, maybe 100 does not change timers from fr to fr_inv, and  I did 
>> not notice before as  180 was coming very fast ?
>> I checked the source, but the test  in t_reply before updating the 
>> timer is not obvoious to see wether timer are canceled on 100 or 180 :-)
>> One thing is sure. If you drop the reply, timer will not be changed.
>>   
> If you dropped it in default onreply route then tm does not get it.
>
> Cheers,
> Daniel
>
>> The destination was a mobile device on PSTN.
>> 180 may be really delayed, and I am not even sure they are mandatory !
>>
>> Aurelien
>>  
>>> klaus
>>>
>>> Aurelien Grimaud wrote:
>>>    
>>>> Daniel-Constantin Mierla a écrit :
>>>>      
>>>>> Hello,
>>>>>
>>>>> On 12/18/08 13:18, Aurelien Grimaud wrote:
>>>>>        
>>>>>> Hi,
>>>>>> In my openser, I had to not relay any provisional which is < 180.
>>>>>> I used drop in reply route to do this.
>>>>>> No provisional < 180 is sent to caller.
>>>>>>
>>>>>> Unfortunately, dropping 100 seems to make the transaction module 
>>>>>> not disarming its fr_timer.
>>>>>>             
>>>>> 100 is disabling the retransmission timer. fr_timer is the 
>>>>> duration to wait until a final response is received, not related 
>>>>> to retransmission and 100 reply.
>>>>>
>>>>>         
>>>> - fr_timer is armed when INVITE is t_relayed and disarmed *only* 
>>>> when a final response is received.
>>>> - fr_inv_timer is armed whenever a provisional (100 - 199) is 
>>>> received, disarmed on final response .
>>>> Well, fr_timer also has to be disarmed when fr_inv_timer is armed 
>>>> right ?
>>>>
>>>> So any provisional (100-199) disarm fr_timer and arm fr_inv_timer.
>>>> But you have not to drop it in reply_route.
>>>>
>>>> In my case, the reply_route I set drops any provisional < 180.
>>>> This means that the 100 response will not make tm module switch 
>>>> fr_timer to fr_inv_timer as it would be if not dropped.
>>>>
>>>> Well this is not a problem, I only dropped provisional from 101 to 
>>>> 180, and all went back to normal.
>>>> Since 100 is not forwarded (because of t_relay already generated 
>>>> one), this makes no difference for end users.
>>>>
>>>> I did not expect drop() statement to change anything for timers.
>>>>
>>>> Thanks.
>>>> Aurelien
>>>>
>>>>      
>>>>> Cheers,
>>>>> Daniel
>>>>>
>>>>>        
>>>>>> The 180 has been waited for more time than my fr_timer so request 
>>>>>> failed and failure_route was called.
>>>>>> In fact, there is no 180, only a 200 ok.
>>>>>>
>>>>>> Can anyone confirm that disarming timer is *not* done if 100 is 
>>>>>> dropped ?
>>>>>>
>>>>>> This is openser 1.2.1
>>>>>>
>>>>>> Regards.
>>>>>> Aurelien
>>>>>>
>>>>>>
>>>>>>
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>>>>>>             
>>>>
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