Need help - 03 Silverado phone / stereo interface

Hello all,

Am looking for info on a cell phone / stereo interface on the high-end Chevy truck models. Supposedly, when properly connected, the stereo will mute and show "Phone Call" on its display. Anyone familiar with this and what type of connector is needed?

Thanks!

Mike

most cell phone kits have an output wire to use as a mute function, you'll need to find out what wire will mute the factory deck. Onstar has to mute the deck so i'm sure there is a wire in the factory harness, which one i dunno