The Unified Messaging server failed to exchange the required certificates with an IP gateway to enable Transport Layer Security ...

The Unified Messaging server failed to exchange the required certificates with an IP gateway to enable Transport Layer Security (TLS) for an incoming call. Please check that this is a configured TLS peer and that the certificates being used are correct. More information: %1. Remote certificate: %2 (%3). Remote end point: %4. Local end point: %5.