Mute button
Redial button
Softkeys
Speaker button
Telephone number card
Transfer button
Volume control button
For turning off (and then back on again) the microphone
of the handset or the speakerphone so the other person
on the call cannot hear you.
For automatically redialing the last number you dialed
from the dial pad.
The 10 unlabeled buttons located on both sides of the
display (5 buttons on each side) correspond to words on
the display screen. Softkeys are used along with display
control keys to access or create a personal Directory of
frequently-called numbers, a Call Log of the most recent
incoming and outgoing calls, and such features as
selecting a personalized ringing pattern, doing a self-test
of your voice/data terminal, and setting the
speakerphone and the clock.
For turning on and off the speakerphone or the
listen-only speaker.
For noting the area code and telephone number of your
voice/data terminal.
For transferring a call to another voice/data terminal.
When on a call, used to increase or decrease the receive
volume of the handset or speakerphone (according to
which one you are using). When you are not on a call,
the Volume control button is used to increase or
decrease the volume of the ringer and the tones.
Routing
Line
RS232
channel
jack
connector
Adjunct
Handset
Handset cord
jack
jack
routing channel
Figure 2. 8520T Voice/Data Terminal (Bottom View)
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