[OpenSIPS-Users] Opensips MS Teams lost BYE

[Chris Johnson]

We were only able to remove one of the fix_nated_contact lines before it broke more than it did fix.

We're currently seeking support from Opensips directly to get it all working correctly.

From: Mark Miranda <mark at markmiranda.com>
Sent: 24 July 2020 21:21
To: john.quick at smartvox.co.uk; OpenSIPS users mailling list <users at lists.opensips.org>
Cc: Chris Johnson <Chris.Johnson at froneri.com>
Subject: Re: [OpenSIPS-Users] Opensips MS Teams lost BYE

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I have basically the same problem where the BYE packet does not seem to be routing properly, however I am not using any of the nat functions.

> On Jul 6, 2020, at 3:46 AM, John Quick <john.quick at smartvox.co.uk<mailto:john.quick at smartvox.co.uk>> wrote:
>
> Chris,
>
> You must not call fix_nated_contact() for any SIP requests or SIP responses
> coming from MS Teams.
> If you do, it will cause exactly the problems you describe for loose-routed
> sequential requests such as BYE.
>
> Just to explain: fix_nated_contact() should only be used when the messages
> come via a NAT router. It must not be used for messages coming from a Proxy
> (assuming the Proxy adds a Record-Route header, as happens with Teams), even
> though both cases may appear to need fixing when you use nat_uac_test().
>
> John Quick
> Smartvox Limited
> Web: www.smartvox.co.uk<http://www.smartvox.co.uk>
>
>> I've managed to get the PBX to send the BYE to the SBC and it is now
> forwarding on to MS (although MS are not sending a reply but we have opened
> a case for this).
>
>> We are struggling to get the BYE packet to go back to MS Teams when the
> call is initiated by Teams.
>
>
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