GMC 2010 Yukon/Yukon XL Owner's Manual page 345

Three Way Calling must be supported on the Bluetooth
phone and enabled by the wireless service carrier
to work.
1. While on a call press
with Ready followed by a tone.
2. Say Three way call . The system responds with
Three way call, please say dial or call .
3. Use the dial or call command to dial the number of
the third party to be called.
4. Once the call is connected, press
the callers together.
Press to end a call.
During a call, all sounds from inside the vehicle can be
muted so that the person on the other end of the call
cannot hear them.
. The system responds
to link all
1. Press . The system responds with Ready
followed by a tone.
2. Say Mute Call . The system responds with
Call muted .
1. Press . The system responds with Ready
followed by a tone.
2. After the tone, say Mute Call . The system
responds with Resuming call .
Audio can be transferred between the in vehicle
Bluetooth system and the cell phone.
During a call with the audio in the vehicle:
1. Press . The system responds with Ready
followed by a tone.
2. Say Transfer Call. The system responds with
Transferring call and the audio will switch from
the vehicle to the cell phone.
4-123