GMC 2010 Terrain Owner's Manual page 200

6-62 Infotainment System
Accepting or Declining an
Incoming Call
When an incoming call is received,
the infotainment system mutes any
audio being played and sounds a
ring tone.
Accepting a Call
Press on the steering wheel
control to answer the incoming call
or touch the Answer option to
answer the call.
Declining a Call
Press / on the steering wheel
controls or select the Decline option
to decline the call.
Call Waiting
Call waiting must be supported on
the Bluetooth phone and enabled by
the wireless service carrier to work.
Switching Calls (Only Available
with Call Waiting)
This feature allows you to switch
between calls, making one call
active and placing the other on hold.