What can make a Communicator call to an outside contact fail?
Communicator is a secure, corporate communications solution. Communicator calls are VoIP calls that require the recipient to have the capability of accepting the call. Making a Communicator call to an outside contact—whether a public IM contact or an outside “phone-only” contact such as a friend, family, or co-worker—is not supported. For an outside contact that is not federated, call the contact using the traditional PSTN/PBX or mobile phone number.
