You received a voice-related error message in Lync 2010. For help on resolving the issue, contact your support team. For information about troubleshooting voice-related error messages, see Audio and video errors.
If you received an error message while placing a voice call in Lync, do the following:
Make sure that your Internet connection is online and working properly.
Check the number or contact that you're trying to reach; make sure that the number or address is entered correctly.
Send an instant message or email to confirm that the call recipient can receive calls.
Note: Voice calls may get disconnected temporarily if your computer or network is experiencing intermittent connectivity issues.