Forum Discussion

Brass Contributor

May 29, 2020

Solved

Outgoing calls from teams dropped

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 o...

calling

Direct Routing

Dan____
Jun 12, 2020
In 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

Dan____

Brass Contributor

Jun 12, 2020

In 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

Henry Morales

Brass Contributor

Feb 15, 2021

Hey Dan____ having the same issue on our side but on handsets. What were the MSFT servers that were blocked?

Thanks

Dan____
Brass Contributor
Feb 19, 2021
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 canhttps://docs.microsoft.com/en-us/microsoftteams/direct-routing-plan#sip-signaling-fqdns that might help.

Hope that is able to point you in the right direction.