You will likely get this message if you put an invalid IP address in the Phone Record and Playback Settings. Under the Media Master drop down box -> Options, you have the option to enter the Desired Extension as well as the Cisco Unity server. Check to make sure the IP address you entered under Cisco Unity server is that of Unity. If you are using the netbios name, make sure DNS is configured correctly.
Jeff Schlesser
Unified Voice Technical Lead
San Jose TAC