[OpenSIPS-Users] Weird behaviour in B2BUA with provisional media

[Johan De Clercq]

Opensips is not a full b2b, use something else for refer

On Thu, Dec 17, 2020, 12:25 Virgílio Cunha <virgilio18vsc at gmail.com> wrote:

> Hello everyone,
>
> I have a problem in B2B behaviour with provisional media configured.
>
> In my scenario, I have a call to a call center that transfers the call
> (REFER) to another one. So, as I have a provisional media configured, a new
> SIP leg is generated by B2B between the user terminal and the media server
> until the call center answers it.
>
> Up to this point the call doesn't show any problem, but if the user
> terminal does a reINVITE to negotiate the SDP, I see weird behaviour.
>
> In the provisional media SIP leg, everything seems right. The media server
> answers to the reINVITE with 200 OK, but the 200 OK never was generated by
> B2B on the terminal SIP leg, instead of it I saw a new ACK forwarded to the
> user terminal (should be a 200 OK) and the B2B generates a new SIP leg to
> same call center referred previously.
>
> Why was a new SIP leg generated to the referred destination? If there's
> not any reinvite from the user terminal the REFER scenario doesn't have any
> problem.
>
> Does anyone know if this behavior was fixed in the latest version?
> Is there any additional configuration that I can do to fix this behaviour?
>
> I am currently using opensips 3.0.2.
>
> Best Regards,
> Virgílio Cunha
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