[SR-Users] Re-invites from carrier breaks the call

[Frank Carmickle]

Using a B2BUA would possibly be a solution. 

--FC
Sent from my 6 plus

> On Feb 19, 2015, at 05:12, Alex Balashov <abalashov at evaristesys.com> wrote:
> 
> ‎Hi Will,
> 
> Unfortunately, there's not a clever workaround at your disposal here, of all scenarios. The SDP payload in the 200 OK must mimic that endpoint's previous SDP answer in order for there to be media continuity. There's just a whole lot of state you can't keep spoof in Kamailio.
> 
> No, alas, it's one of those cases where basic SIP compliance issues in the endpoints really must be fixed. Sorry.
> 
> --
> Sent from my BlackBerry. Please excuse errors and brevity.
> From: Will Ferrer
> Sent: Wednesday, February 18, 2015 9:44 PM
> To: Kamailio (SER) - Users Mailing List
> Reply To: Kamailio (SER) - Users Mailing List
> Subject: Re: [SR-Users] Re-invites from carrier breaks the call
> 
> Hi Alex
> 
> Thanks so much for the reply.
> 
> Is there anything that we could do perhaps that is a more creative solution, for instance not passing the re-invite all the way to the softphone and just responding from the kamailio box handling the call?
> 
> We tried this as well actually, but we didn't get it to work. We just sent a 200 ok from the kamailio box, no sdp or anything on the packet since we sent it with just send_reply and the carrier just sent a bye.
> 
> Hopefully there is something clever we could do to correct the problem, it is preventing us from using alot of our carriers since the re-invite breaks our clients softphones.
> 
> Thanks again for the assistance.
> 
> All the best.
> 
> Will Ferrer
> 
>> On Wed, Feb 18, 2015 at 6:07 PM, Alex Balashov <abalashov at evaristesys.com> wrote:
>> Kamailio cannot correct this. This is an endpoint issue. The whole point of Record-Route is to hairpin sequential requests (and indeed, their replies) through the proxy. The endpoints need to comply by affixing the correct Route header to the end-to-end ACK.
>> 
>> --
>> Sent from my BlackBerry. Please excuse errors and brevity.
>> From: Will Ferrer
>> Sent: Wednesday, February 18, 2015 9:01 PM
>> To: Kamailio (SER) - Users Mailing List
>> Reply To: Kamailio (SER) - Users Mailing List
>> Subject: [SR-Users] Re-invites from carrier breaks the call
>> 
>> Hi All
>> 
>> We have any issue with re invites coming from the carrier.
>> 
>> When a reinvite occurs, our softphone client gets the invite, sends a 100, and then sends 200 ok. However the 200 ok does not have the softphones ip in the record route. Since it's not in the record route the ack from the carrier never makes it's way all the back to the softphone.
>> 
>> This causes the softphone to keep sending 200 oks since it never gets the ack.
>> 
>> Eventually the softphone gets tired of sending 200 oks and sends a bye.
>> 
>> Is there any way that Kamailio can help me correct for this, or do we need to have our clients use different softphones? If it has to be handled via softphones is there even a softphone that can account for this?
>> 
>> Thanks for all your assistance in advance.
>> 
>> All the best.
>> 
>> Will Ferrer
>> 
>> Switchsoft
>> 
>> 
>> 
>> 
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> 
> 
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