This situation is known as "glare". It is discussed in rfc 3261 and in
http://www.ietf.org/internet-drafts/draft-ietf-sipping-race-examples-05.txt.
In short, both sides should send a 491 response, back off, and retry.
Paul
Maciej Kowalski wrote:
> Hi Everybody.
>
> I'm currently working on SIP/TDM Gateway application.
> I've encountered following problem.
> During Sip dialog both sides at the exactly same moment send Re-Invite
> requests.
> Those are reaching their destinations while both client are expecting
> replies. What should be the behavior of SIP client in a situation like that.
>
>
>
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