Callpilot Desktop Messaging telset error

This might be something simple, I am using the CallPilot desktop
messaging client (4.0) and can receive my voice messages in Outlook
and they play fine on my computer but when I click the Telset button
to play the message to my phone I get the following error message
"Destination is restricted or does not exist" anyone have this issue
or know what it means?

Thanks

.