Google Voice announces call even when phone is silenced

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http://androidforums.com – I have a Galaxy S3 on Verizon. Google Voice is active and working. I'm not sure if this occurs with every call to my Google Voice number, but I have noticed that an audible voice ("press 1 to accept call ...") comes through even though I have the phone muted and Driving Mode is off. Is this a bug or is there something I'm missing to make the phone totally silent? (General)