Iwatsu DCKT970 Owner's Manual page 39

Chapter 4 Using Your DCKT970 Handset
Handset Ringer Tone and Volume
Press R/VOL on the side of the Handset in Standby mode to
select seven ringer tones and volume combinations.
Vibrate Mode
"Ring off" shown on the above display is the Vibrate Mode.
If you set the ringer off and the Handset is not on the charger,
the Handset will vibrate when there is an incoming call.
If you set the ringer off and the Handset is on the charger, the
Handset will ring as Ring Type-A Low.
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