Panasonic KX-T7720E - Manual (Page 10)

Initial Settings
Speaker volume *
Press SP-PHONE. Press Up or Down.
While in on-hook or during a conversation
Handset/Headset volume *
Press Up or Down.
While using a handset or headset
Ringer volume
SP SP-PHONE
Display contrast *
Press Left or Right.
While in on-hook or receiving a call
KX-T7730
While in on-hook or receiving a call
Slide the lever of the RINGER Volume Selector
to the desired setting (HIGH/LOW/OFF).
RINGER
* The above settings may return to default settings if the telephone line cord is
disconnected or the main unit's power is interrupted.
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