[OpenSIPS-Users] stuck dialogs on proxy thru b2bua

[Anca Vamanu]

Hi,

I made some fixes regarding some similar cases - BYE not being 
transmitted on the other side, but only in trunk now. I will make the 
backport now and let you know when it is done.

Regards,

-- 
Anca Vamanu
www.voice-system.ro



On 10/06/2010 07:45 PM, thrillerbee wrote:
> I've setup several OpenSIPS proxies (keeping track of 
> dialogs,acc,etc.) behind a OpenSIPS B2BUA (to implement topology 
> hiding - nothing else).
> I'm currently using version 1.6.3 on both the proxy & b2bua.  I 
> updated the b2bua modules from svn yesterday.
>
> Certain dialogs "hang" because of how the B2BUA handles an 
> inappropriate response to an INVITE in a never-established (canceled) 
> dialog coupled with the proxy establishing a dialog after a CANCEL has 
> been processed.
>
> After the initial call attempt is canceled, the upstream carrier 
> responds with a 200 OK to the INVITE.  The B2BUA sends that back to 
> the OpenSIPS proxy.  The OpenSIPS proxy creates a dialog even though 
> the INVITE has been canceled.  Soon afterwards, a BYE is received from 
> upstream but the B2BUA does not send that back to the proxy.  As a 
> result, the dialog hangs (until the timeout is reached).  I've tried 
> to show the call flow below:
>
> proxy          b2bua         carrier
>
> ----- INV ----->
> <---- 100 ------
>                 ------ INV ---->
> <----- 100 -----
> <----- 183 -----
> <---- 183 ------
> --- CANCEL ---->
> <- 200(cancel)--
>                 --- CANCEL ---->
> <- 200(cancel)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <- 200(invite)--
> <----- BYE -----
> <- 200(invite)--
> <----- BYE -----
> <- 200(invite)--
>
> I'm hoping I'm doing something stupid in my implementation that could 
> cause this behavior.  Thanks for any help that might resolve this issue.
>
>
>
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