[OpenSER-Users] OpenSER Sending INVITE Twice!?

[Ovidiu Sas]

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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