I see that your model year DTS may have a Talk/Mute button that can be used to interact with OnStar Hands-Free Calling, according to your owners manual. See Audio Steering Wheel Controls on page 3-123 of your owners manual for more information, and email me at Katie_Lucille@gmexpert.com with the last eight of your VIN if you'd like me to check my resources to see what came equipped on your vehicle.
Best,
Katie
Cadillac Customer Service
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