AT&T SYSTEM 25 User Manual page 5

The 420 Speakerphone
Figure 1 shows one kind of multifeature single-line
420 Speakerphone, with key parts identified and the handset
removed. The sections following Figure 1 describe the voice
terminal's buttons, dial signals, and tones.
420 Speakerphone
FIGURE 1
Telephone
Number Card
2
Emergency
Number
Locations
Switchhook
P R O G R A M
R E D I A L
O F F L O H I L O
R I N G E R
Ringer
Volume
Control
Frequently
Called
Numbers
Chris
566–1234
Sherri
566–4217
566–0612 Tom
Terry
Office
Mom Bob
Frank Gail
F L A S H H O L D
M U T E
S P E A K E R
HI NORM LOUD
SPEAKER RECEIVER
Receiver
Speaker
Volume
Volume
Control
Control
terminal, the
Memory
Buttons
Hold
Indicator
Speaker -
phone
Indicator
Illuminated
Dial Pad