Cardo Systems PACKTALK PRO Manual page 15

To answer a call:
Tap the mobile button
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To ignore a call:
Roll the Control Wheel backward or say "Ignore".
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To end a call:
Tap the mobile button or tap the Control Wheel or say "Hey Cardo, End Call".
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4.2.1 SWITCHING BETWEEN TWO CALLS ON TWO MOBILE PHONES
To disconnect the current call and switch to the other call:
or tap the Control Wheel or say "Answer".
or
or
tap on media button once
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