We have noticed that when pressing the "Teams Meeting" button on the home screen of our Trio's that it seems to hang on calling 4117xxxxx. The device can then crash at this stage and reboot.
When reattempting after a reboot the device progresses from 4117xxxxx to sip:firstname.lastname@example.org but it can then fail to connect. This can happen for a number of times before it eventually connects.
We have checked our Firewalls and can see no traffic hitting them whilst the devices fail to connect. When the devices connect we can see the traffic.
The Trios are currently running 184.108.40.2063 but we are about to try 220.127.116.1145 to see if this helps.