If you received an error message while placing a voice call in Lync, do the following:
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Make sure that your Internet connection is online and working properly.
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Check the number or contact that you’re trying to reach; make sure that the number or address is entered correctly.
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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.
