Test-CsExUMConnectivity -UserSipAddress xxx -TargetFqdn yyy -UserCredential $credentials -Verbose
Target Fqdn : yyy
Result : Failure
Latency : 00:00:01.6121528
Error Message : 480, Temporarily Unavailable
Diagnosis : ErrorCode=15030,Source=yyy,Reason=Fail
ed to route to Exchange Server,appname=ExumRouting,dialplan=Hos
At the same time onPremise UM voicemail is ok, as well if we move user to another pool it works.
The issue is related to egde who did not recognise newly deployed SBA:
event ID 14402:
Multiple incoming connections on internal edge from non-internal servers.
In the past 305 minutes the server received 30 incoming connections on internal edge from non-internal servers. The last one was from host xxx.
Cause: This can happen if an internal server is not present in the list of internal servers on the Access Edge Server.
If the server is a valid one, you need to add it to the list of internal servers on the Access Edge Server. If the server is invalid, you may be under an attack from that server.
Solution: reboot edge who will re-read server internal list from topology.