Forum Discussion
REASON Q.850;cause 18 text Call Controller timed out while waiting for acknowledgement.
Incoming calls to Microsoft teams get disconnected automatically after 20 seconds. You can make a call from outside, teams phone rings, answer the call, 2 way communication is there but still teams c...
We are seeing the exactly same issue with one customer, an another deployment works just fine. Let us know if you hear anything about the solution.
Eerik Kiskonen Our issue is finally fixed.
The solution was SBC was sending the IP address in ACK messages for 200 OK it received from Teams. Teams expect contact header FQDN from the 200 OK in the ACK message, not the IP.