GMC 2010 Yukon/Yukon XL Owner's Manual page 344

1. Press and hold
responds with Ready followed by a tone.
2. After the tone, say Re dial . The system responds
with Re dial using <phone name> and dials the
last number called from the connected Bluetooth
phone.
Once connected, the person called will be heard
through the audio speakers.
When an incoming call is received, the audio system
mutes and a ring tone is heard in the vehicle.
Press and begin speaking to answer the call.
Press to ignore a call.
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for two seconds. The system
Call waiting must be supported on the Bluetooth phone
and enabled by the wireless service carrier to work.
Press to answer an incoming call when
another call is active. The original call is placed
on hold.
Press again to return to the original call.
To ignore the incoming call, continue with the
original call with no action.
Press to disconnect the current call and
switch to the call on hold.