Chevrolet 2010 Equinox Owner's Manual page 196

6-66 Infotainment System
Dual Tone Multi-Frequency
(DTMF) Tones
The in-vehicle Bluetooth system can
send numbers during a call, this is
used when calling a menu driven
phone system.
1. Press the hard key.
2. Select Enter Number option
and enter the number sequence.
The DTMF Tones will be generated
on the network as you enter each
number.