Yealink CP960 User Manual page 77

You can also drag the volume slider to adjust the ringer volume.
To adjust the talking volume:
When the phone is during a call:
Tap one of the Volume touch key to increase or decrease the volume of speakerphone.
1.
You can also drag the volume slider to adjust the talking volume.
To adjust the key tone volume:
When the phone is on the dialing screen:
Tap one of the Volume touch key to increase or decrease the key tone volume.
1.
You can also drag the volume slider to adjust the key tone volume.
Customizing Your Phone
77