Linux 2 Linux voice call not working

Question

When starting a new call from a Linux client to a Linux client (both Ubuntu 18.04) , from today the remote peer does not receive any call.
The same seems to happen also from Linux (ubuntu 18.04) client to MS Windows 10 client

Answer 1

We have resolved the issue.
IT has closed access to skype consumer logon service, and this blocked also part of the Teams login.
(I think https://api.spaces.skype.com).
Reopening access to skype service, has solved the issue

Answer 2

Are there any error messages in your Teams for Linux client?
I did a test in my environment and it works well.

Answer 3

If I start the call no error is displayed, but the other party simply does not receive the call. When the other party start the call, is exaclty the same. No differences if I try to perform a test call to Teams Echo service: is simply does not answer.

Unluckily I've not the possibility to perform test on other workstations then mine. The problem affect a lot of my collegues (only those using Ubuntu workstation), but not exatcly all of them.