GE 27957 ユーザーズマニュアル

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Speakerphone
1.  Press the SPEAKER/CALL BACK button.
2. Wait for a dial tone, then dial the desired number. Or, dial the number 
and then press the SPEAKER/CALL BACK button.
3. When finished, press SPEAKER/CALL BACK to hang up.
Manual Channel Selection
While talking, you might need to manually change the channel in order 
to reduce static caused by baby monitors, garage door openers, or other 
cordless phones. Press and release the CHAN/delete button on the cordless 
handset to advance to the next clear channel while in talk mode. 
Call Timer
After you press TALK/call back on the cordless handset (or lift the corded 
handset, or press the SPEAKER/CALL BACK button on the base), the built-in 
call timer shows in the display and begins counting the length of time of the 
call.
Auto Standby
Placing the cordless handset in the charge cradle while the handset is off 
the hook (or during a call) automatically hangs up the handset.
Ringer Volume Control
Handset
Use the two-position switch on the cordless handset to turn the ringer off or 
on.
The ringer switch must be in the ON position for the cordless handset to 
ring when incoming calls are received.
Base Unit
The base ringer volume is set through the programming menu. Refer to 
Telephone Set Up for more information.