[OpenSIPS-Users] MS Teams REFER transfer on hold.

[Yuriy Nasida]

Guys,

Hold/Unhold, blind transfers is fine without REFER support
But... Please note that attended  (consult) transfer will not work.
I did many tests and MS does 3th call to connect  Transferee and Transfer
Target. Not sure why. I tried same things from regular softphone - and
it works great without 3th call.



On Sat, 9 May 2020 at 00:02, Slava Bendersky via Users <
users at lists.opensips.org> wrote:

> Hello Johan,
> Thank you for reply and help.
> Based on MS Teams   Allow header will disable REFER and MS Teams will send
> invite in dialog.
> The following code  snippet on 200 OK reply  is resolve the issue.
>
>                         $var(refer-allow) = "INVITE, ACK, CANCEL, BYE,
> INFO, NOTIFY, PRACK, UPDATE, OPTIONS";
>                         remove_hf("Allow");
>                         insert_hf("Allow: $var(refer-allow)\r\n");
>
>
>
> volga629
> ------------------------------
> *From: *"johan" <johan at democon.be>
> *To: *"OpenSIPS users mailling list" <users at lists.opensips.org>
> *Sent: *Friday, May 8, 2020 9:58:56 AM
> *Subject: *Re: [OpenSIPS-Users] MS Teams REFER transfer on hold.
>
> try with replying that you don't support refer.
> On 8/05/2020 11:19, Slava Bendersky via Users wrote:
>
> Hello Everyone,
> I am trying put tougher transfer feature with in MS Teams.
> And based on my research and testing right now is not possible with
> opensips.
> MS Teams are sending on hold  in case of transfer and onhold as a=inactive.
> Major problem they require encode/decode params in REFER-TO REFER-BY.
>
> MS Teams expect observe REFER with 202 and decode params  with future
> action.
>
> Here official requirements doc.
>
>
> https://docs.microsoft.com/en-us/microsoftteams/direct-routing-protocols-sip#call-transfer
>
> Any suggestion welcome.
>
> volga629.
>
>
>
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