General Trying to turn off auto answer during bluetooth connection

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http://androidforums.com – Wife has a Verizon Samsung Charge phone that is linked to a Kenwood bluetooth system in our vehicle. She uses the bluetooth connection a lot to listen to Pandora on the phone while driving. However, when an incoming call comes in, it auto answers and immediately takes the call instead of letting her decide to pick it up or not. How can I turn the bluetooth auto answer feature OFF for this phone? (General)