[SR-Users] Asterisk re-INVITE race condition, error 500.

[Olle E. Johansson]

On 04 Feb 2014, at 10:43, Klaus Darilion <klaus.mailinglists at pernau.at> wrote:

> Asterisk's transcation layer is quite buggy - so it may also be that the reINVITE with Cseq 103 is a retransmission of a previous transaction (which was not stopped correctly).
> 
You are wrong. The transaction layer in chan_sip is NOT buggy. It simply does not exist.

/O
> regards
> Klaus
> 
> On 04.02.2014 08:52, dotnetdub wrote:
>> Hi Olle,
>> 
>> Just a quick update..
>> 
>> I've gone through this in detail and the issue is actually that
>> asterisk sends an UPDATE with CSeq: 104 UPDATE
>> 
>> and when FS respond  OK asterisk then sends its REINVITE with CSeq: 103 INVITE
>> 
>> As far as I can tell Freeswitch at this point is perfectly within its
>> rights to send a 500 as the CSEQ is out of order.
>> 
>> Should I file a bug report on the asterisk tracker to get this fixed?
>> 
>> Regards
>> Brian
>> 
>> 
>> 
>> On 31 January 2014 08:17, Olle E. Johansson <oej at edvina.net> wrote:
>>> 
>>> On 30 Jan 2014, at 23:23, dotnetdub <dotnetdub at gmail.com> wrote:
>>> 
>>>> Hi David,
>>>> 
>>>> Sorry to drag up a very old thread - we are seeing this also with
>>>> asterisk kamailio and FS and I have tried lots of different
>>>> combinations on both asterisk and FS to make it go away without
>>>> success.. Did you ever come up with something better than the usleep ?
>>>> 
>>> If freeswitch believes it already has an open INVITE transaction it should
>>> not respond with 500, it should respond with 491 request pending. In that
>>> case Asterisk will back off and retry.
>>> 
>>> Please check with the FreeSwitch people and file a bug report so that they
>>> can fix this issue. That's the long term solution, all the rest is just quick and
>>> dirty fixes. Seems like if this problem is still around, no one filed a bug report.
>>> 
>>> /O
>>>> Many Thanks
>>>> 
>>>> 
>>>> 
>>>> 
>>>> On 3 June 2013 20:23, David K <kamailio.org at spam.lublink.net> wrote:
>>>>> Hello all,
>>>>> 
>>>>> So I have three machines, we don't care about audio for this problem, so
>>>>> everything I mention here is SIP related.
>>>>> 
>>>>> Freeswitch <--> Kamailio 3.3.2 <--> Asterisk
>>>>> 
>>>>> 1. Asterisk sends an INVITE to Freeswitch through the Kamailio proxy.
>>>>> 2. Kamailio replies 100 Trying and forwards to Freeswitch
>>>>> 3. Freeswitch replies 100 Trying
>>>>> 4. Freeswitch replies 180 Ringing to Kamailio
>>>>> 5. Kamailio routes the answer to Asterisk
>>>>> 6. Freeswitch replies 200 OK to Kamailio
>>>>> 7. Kamailio replies 200 OK to Asterisk
>>>>> 8. Asterisk replies ACK to Kamailio
>>>>> 9. Asterisk sends a re-INVITE to Freeswitch through Kamailio
>>>>> 10. Kamailio routes the re-INVITE to freeswitch
>>>>> 11. Kamailio routes the ACK to freeswitch.
>>>>> 12. Freeswitch replies 500 Server error because it got a re-INVITE before
>>>>> the ACK.
>>>>> 
>>>>> So, my problem is that Kamailio seems to process my re-INVITE more quickly
>>>>> than the ACK. So Freeswitch replies an error because it got the re-INVITE
>>>>> before the ACK.
>>>>> 
>>>>> So my "solution" is to add a usleep(20); for re-INVITEs on Kamailio, but I
>>>>> think this is a lousy solution.
>>>>> 
>>>>> Has anyone here had to deal with problems where Kamailio routes a re-INVITE
>>>>> faster than an ACK causing endpoints to return error messages?  Has anyone
>>>>> had to deal with a similar issue?
>>>>> 
>>>>> Thanks,
>>>>> 
>>>>> David
>>>>> 
>>>>> 
>>>>> 
>>>>> _______________________________________________
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>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>> 
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