10
No.
Button/Control
Description
16
Up volume button
Press this button to raise the volume of the ring
while your telephone is ringing, raise the voice
level of the callers while talking through the
handset, or raise the volume of the speaker
while in speakerphone mode.
17
Mute button
While on a call, you can press the
Mute
button
to prevent callers from hearing you. When the
telephone is muted, the backlight of the Mute
button is turned on.
18
Down volume button
Press this button to lower the volume of the
ring while your telephone is ringing, lower the
voice level of the callers while talking through
the handset, or lower the volume of the
speaker while in speakerphone mode.
19
Handset
Pick up the handset to talk to the callers.
Figure 3 shows the buttons and controls on the 3503 telephone.
Figure 3
3503 telephone
1
2
3
7
8
9
10
11
6
12
14
13
18
17
16
19
5
4
15
Table 5
Functions of the 3503 telephone buttons and controls
No.
Button/Control
Description
1
Soft buttons
There are five soft buttons below the Display
Panel. The bottom of the Display Panel shows
the functions of the five soft buttons, which
vary with the state of the telephone. You can
select different functions by pressing different
