I would like share an issue with you in an Microsoft Teams environnment.
In Teams Only mode, I meet the following issue : I can not to answer a call comming from a Teams Call Queue using a VVX Phone (test only with VVX 401).
I can reproduce the problem at 100% either the lastest release 5.9 or 5.6 (O365 release).
The calls is correctly routed to the phone through Teams Call Queue
The phone is ringing
We try to answer the call and it seems to be connected few moment
But the VVX phone seems hang up and the call is again routed on the phone
And it loops ...
Note : The is any problem in basic calls scenarios. I mean incoming DDI call or a the outgoing call using dialpad. Moreover I came back in Islands mode or SFB Only mode too, no problem is this scenario too.