The MCUFactory failed to find an Audio Conferencing Provider Server to service a phone conferencing modality request. Cause: ...

The MCUFactory failed to find an Audio Conferencing Provider Server to service a phone conferencing modality request.

Cause: All Audio Conferencing Provider Servers are unavailable or overloaded.
Resolution:
Verify that all Audio Conferencing Provider Servers are available and are not overloaded. If overloaded deploy an extra server to distribute load