Setting the Area Code
If you can make a call by dialing only 7 digits (instead of 10), you can program your local area code in your phone. If you get a call from within your area code, you'll only see the 7-digit phone number. If you get a call from outside your area code, you'll see all 10 digits.
If your calling area requires 10-digit dialing, do not program this option.
1) Press the MENU soft key. Select the Global Setup
menu, and then the Area Code submenu. 2) Press the number keypad (0-9) to enter a 3-digit area
code. 3) Press the OK soft key. You will hear a confirmation tone.
If the area code already been stored in memory, the stored area code will be displayed. To change it, use the DELETE soft key and number keys to enter the new area code.
Handset and Base Setup Menu Options
The following submenu options must be set separately for each handset and the base.
Selecting a Ringer Volume You can choose from one of three ringer volumes.
From the handset 1) Press the MENU soft key. Select the Handset Setup menu, and then the Ringer Volume submenu.
2) Press cid/vol/ LOW, or OFF.
to select HIGH,
MAIN MENU OPTIONS 
MAIN MENU OPTIONS