[SR-Users] BYE Race Condition

[Brandon Armstead]

Daniel,

   I will try this -- and get back to you.  I noticed the 408 timeout as
well -- and thought that this call flow was strange.  Thanks!

Sincerely,
Brandon Armstead

On Mon, Jul 30, 2012 at 1:03 AM, Daniel-Constantin Mierla <miconda at gmail.com
> wrote:

>  Hello,
>
> first, such race can happen always and it is ok from sip rfc point of
> view. The carrier UA should have received the BYE from the other side and
> close the dialog, then ignore the rest. So it is a broken UA implementation
> imo.
>
> Let's say you just drop the 481, then the BYE will time out (408)? Is the
> carrier UA still complaining? You can make a failure route for BYE and if
> it is 481, then use t_reply("408", "Timeout") if that makes the UA happier.
>
> Cheers,
> Daniel
>
>
> On 7/28/12 8:42 PM, Brandon Armstead wrote:
>
> Hello,
>
>     I am running into an issue where there is a race condition happening.
>  I am looking for opinions / ideas on how to handle the following below
> scenario.
>
>  Scenario.
>
>  UAC places an outbound call -> upstream carrier.
>
>  The call is disconnected on both ends at the exact same time,
>
>  UAC -> sends BYE upstream
>
>  Upstream Carrier -> sends BYE downstream
>
>  Upstream 200 OK's the BYE
>
>  UAC sends 481 back to Upstream Carrier for their generated BYE.
>
>  The upstream carrier is complaining about receiving the relayed 481
> responses -- so my first thought was simply to drop() these from relaying
> upstream.
>
>  I am curious how other people are handling this?
>
>  Would you suggest simply dropping the relay from being sent back
> upstream on the 481?
>
>  Would you simply always 200 OK a downstream BYE from trusted carriers
> regardless of UAC response, and create separate transaction to send BYE
> downstream?
>
>  Thank you as always.  Look forward to your thoughts / suggestions /
> ideas.
>
>  Sincerely,
> Brandon Armstead
>
>
> _______________________________________________
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>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> Kamailio Advanced Training, Seattle, USA, Sep 23-26, 2012 - http://asipto.com/u/katu
> Kamailio Practical Workshop, Netherlands, Sep 10-12, 2012 - http://asipto.com/u/kpw
>
>
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