AT&T 7720 사용자 설명서

To answer using the speakerphone, press 

K on the base.  The speaker

light goes on and the call is connected.  To end the call, press 

K again.

Press + to increase speakerphone volume.  Press - to decrease volume.

Mute allows you to hear your caller, but prevents the caller from hearing you.
To activate the Mute feature, press m, then select 

MUTE while on a

call.  The MUTE light on the base goes on and the screen displays 

MUTE.

To deactivate the Mute feature, select 

UNMUTE.

Press 

H. The SPEAKER light flashes. To return to the call, press H again

— OR —
Press 

P on the handset

— OR —
Press 

K on the base

— OR —
Lift the handset of an extension phone on the same line.

The Page feature allows you to signal someone at the handset from the base.
1

Make sure the HANDSET IN USE light on the base is off.

Press i on the base.  This sends a three-part paging tone
to the handset.

The display will show 

PAGING FROM BASE.  Select INTERCOM.  The

INTERCOM/HANDSET LOCATOR light on the base goes on and the
handset and base can communicate with each other without tying up
the telephone line.

Select 

OFF on the handset to close the intercom connection.

This feature is useful if you misplace the handset.
To locate the handset using this feature, press and hold
i on the base for approximately four seconds.  A repeating
paging tone is sounded at the handset.
To cancel the Handset Locator feature, press 

h on the handset or

i on the base.
This feature will automatically turn itself off in approximately three
minutes if you haven’t turned it off before then.