We noticed a strange issue. If someone calls a user in Teams.. from the Mobile App and click answer... the call will drop immediately. However, if Teams is running on a non VDI machine, it works fine. Doesn't matter if the caller is external or internal to the company.
We are running Horizon 2306.
My Teams VDI version is 1.6.00.29964. Though we are seeing this same situation with other versions of Teams.
Looking at the Teams call logs I am getting "Response code: 410"
Teams Phone → Mobile App = Works
Mobile App → Teams Phone = Works
Mobile App → Mobile App = Works
Mobile App → Physical Desktop App = Works
Physical Desktop App → Mobile App = Works
Mobile App → VDI Desktop App = Drops
VDI Desktop App → Mobile App = Drops