Skype for Business Certified IP Phones with Microsoft Teams

Hi Wim Allegaert, 

You are not alone. I have experienced this exact issue, with traces showing that the SIP BYE message was coming from the VVX handset, tearing down the call. This was on a range of VVX handsets, not just 201s (as expected, running same code on all).

Given the multitude of issues VVX phones have experienced since Teams support was first announced, I didn't bother opening a case\investigating further. You only have to read back through this thread to get a feel for multitude of issues and lack of clarity as to what's actually supported, and as you have experienced opening a case rarely leads to a solution.

Instead, two possible workarounds that I came up with\tested successfully:

• Create a dummy user, give it an internal extension and setup a Call Group that has the same members as the Call Queue. Use a dial plan to manipulate internal calls to actual Call Queue number to this new extension if end users are unlikely to remember\dial a new number
• Use dial plan to route calls to this number to a dummy number that routes out towards your SBC(s). Pick the call up here and manipulate\re-route back to Call Queue. Not pretty but it works

Hope this helps