The Mediation Server service failed a call because of too little bandwidth available on the gateway leg of a call. The Mediation ...

The Mediation Server service failed a call because of too little bandwidth available on the gateway leg of a call.

The Mediation Server service failed a call because of a lack of bandwidth to gateway %1.
Cause: The link going to this endpoint is overloaded. Check PDP for more information.
Resolution:
This failure will resolve itself as the link becomes less congested.  If it happens often, consider allocating more bandwidth to this link.