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<div>Can you send a trace (pcap)?</div>
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<div class="ms-outlook-ios-signature" id="ms-outlook-mobile-signature"><a href="https://aka.ms/o0ukef">Outlook voor iOS</a> downloaden</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Van:</b> Users <users-bounces@lists.opensips.org> namens Yuriy Nasida <ynasida@gmail.com><br>
<b>Verzonden:</b> Monday, May 11, 2020 8:50:44 AM<br>
<b>Aan:</b> OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Onderwerp:</b> Re: [OpenSIPS-Users] MS Teams REFER transfer on hold.</font>
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<div dir="ltr">Guys,
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<div>Hold/Unhold, blind transfers is fine without REFER support<br>
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<div>But... Please note that attended (consult) transfer will not work.</div>
<div>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.</div>
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<div dir="ltr" class="x_gmail_attr">On Sat, 9 May 2020 at 00:02, Slava Bendersky via Users <<a href="mailto:users@lists.opensips.org">users@lists.opensips.org</a>> wrote:<br>
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<div>Hello Johan,</div>
<div>Thank you for reply and help.</div>
<div>Based on MS Teams Allow header will disable REFER and MS Teams will send invite in dialog. </div>
<div>The following code snippet on 200 OK reply is resolve the issue.</div>
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<div> $var(refer-allow) = "INVITE, ACK, CANCEL, BYE, INFO, NOTIFY, PRACK, UPDATE, OPTIONS";</div>
<div> remove_hf("Allow");</div>
<div> insert_hf("Allow: $var(refer-allow)\r\n");</div>
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<div>volga629</div>
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<div><b>From: </b>"johan" <<a href="mailto:johan@democon.be" target="_blank">johan@democon.be</a>><br>
<b>To: </b>"OpenSIPS users mailling list" <<a href="mailto:users@lists.opensips.org" target="_blank">users@lists.opensips.org</a>><br>
<b>Sent: </b>Friday, May 8, 2020 9:58:56 AM<br>
<b>Subject: </b>Re: [OpenSIPS-Users] MS Teams REFER transfer on hold.<br>
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<p>try with replying that you don't support refer. <br>
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<div>On 8/05/2020 11:19, Slava Bendersky via Users wrote:<br>
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<div>Hello Everyone,</div>
<div>I am trying put tougher transfer feature with in MS Teams.</div>
<div>And based on my research and testing right now is not possible with opensips.</div>
<div>MS Teams are sending on hold in case of transfer and onhold as a=inactive.</div>
<div>Major problem they require encode/decode params in REFER-TO REFER-BY.</div>
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<div>MS Teams expect observe REFER with 202 and decode params with future action.</div>
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<div>Here official requirements doc.</div>
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<div><a href="https://docs.microsoft.com/en-us/microsoftteams/direct-routing-protocols-sip#call-transfer" rel="nofollow noopener noreferrer" target="_blank">https://docs.microsoft.com/en-us/microsoftteams/direct-routing-protocols-sip#call-transfer</a></div>
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<div>Any suggestion welcome.</div>
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<div>volga629.</div>
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