May 29 2020 09:30 AM
All outgoing calls are being dropped after about 10 seconds of silence with Q.850 ;cause=22 being returned to the SBC and the following error displayed to the user:
It only happens in one of our offices if the same account logs into a machine in a different office it's fine and it never occurs on the WebClient only the desktop client.
Anyone seen this before?
Jun 12 2020 12:19 AM
SolutionIn case anyone comes across this post in future, it turned out to be a firewall issue whereby one of the MSFT servers was blocked, but this did not affect the regular Teams usage at all only PSTN it also didn't effect the Teams web client
Feb 15 2021 01:41 PM
Feb 19 2021 09:02 AM
@Henry MoralesUnfortunately I don't remember our exact case but I think it was to do with sip.pstnhub.microsoft.com there is a docs page on the SIP signaling fqdns that can be found here that might help.
Hope that is able to point you in the right direction.
Jul 27 2023 03:42 AM
@dan_ ___
But what if user is connected to the home network. Does firewall play any role between it ?
I dont think so. Could you please suggest what we can do further to isolate this ?
Jul 27 2023 03:48 AM
This really depends on how the end users machine is configured.
If it is just a standard home PC connecting to a home internet connection then I would not expect this to be an issue.
If the user is on a corporate laptop it could be configured to use a VPN or proxy etc.
Jul 27 2023 04:22 AM
Jun 12 2020 12:19 AM
SolutionIn case anyone comes across this post in future, it turned out to be a firewall issue whereby one of the MSFT servers was blocked, but this did not affect the regular Teams usage at all only PSTN it also didn't effect the Teams web client