[OpenSER-Users] OpenSER Sending INVITE Twice!?

[Tavis P.]

It may also be related to the timer accuracy of OpenSER 1.1

If the T1 interval is 500ms but OpenSER 1.1 doesn't support sub-second
timer accuracy it is probable to see it retransmitting in situations
where T1 hasn't been reached yet
It shouldn't cause any problems though, just a few erroneous retransmits
from time to time

tavis

Ovidiu Sas wrote:
> Hi Douglas,
>
> You posted this questionawhileago and by checkingthe archives
> Irealised that my answer was truncated somehow ...
> Here's the full answer:
>
> This is the way that is supposed to work.  If nothing is received from
> upstream, the request is resent.
> >From the rfc3261:
>
> 17.1.1.1 Overview of INVITE Transaction
>
>   The INVITE transaction consists of a three-way handshake.  The client
>   transaction sends an INVITE, the server transaction sends responses,
>   and the client transaction sends an ACK.  For unreliable transports
>   (such as UDP), the client transaction retransmits requests at an
>   interval that starts at T1 seconds and doubles after every
>   retransmission.  T1 is an estimate of the round-trip time (RTT), and
>   it defaults to 500 ms.
>
>
> It seems that your upstream UAS is slowin sending out the 100 Trying
> and therefor openSER is resending out the INVITE.
>
>
> Regards,
> Ovidiu Sas
>
> On Dec 3, 2007 12:35 PM, Douglas Garstang <dougmig33 at yahoo.com> wrote:
>   
>> I have an OpenSER 1.1 install here, and for some reason, OpenSER is sending
>> the INVITE message twice to the upstream host.
>>
>> Asterisk        OpenSER        Provider
>> -----------------------------------------------
>> | ---INVITE---> |                           |
>> |                         | ---INVITE--->   |
>> |                         | ---INVITE--->   |
>> |                         | <---TRYING--- |
>> |                         | <---TRYING--- |
>>
>> The time difference between them is about 1/5 of a second. Nothing is
>> received between the first and second INVITE's.
>>
>> Why is OpenSER doing this?
>>
>> I have xlog() statements everywhere in openser.cfg, and OpenSER is only
>> logging ONE outgoing INVITE message, eventhough it's sending two. It is
>> logging the multiple TRYING messages that come back however.
>>
>> OpenSER is not calling failure_route because nothing is logged in there.
>> What could be going wrong? Why is it doing this?
>>
>> Doug.
>>
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>>     
>
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