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7406D, 7406BIS, and 7406 Plus Voice Terminals
MUTE button (on 7406BIS and 7406 Plus)
The 7406BIS and the 7406 Plus (7406D05A—7406D08A) voice terminals are equipped with a
MUTE button. This button is a fixed feature button with a red status light. The MUTE button
turns off the microphone of the built-in speakerphone or the handset so that a person can con-
verse with another person in the room without the other party listening in.
VOLUME button (on 7406BIS and 7406 Plus)
The 7406BIS (7406D05A and 7406D06A) voice terminal has a SPEAKER VOLUME ‘‘arrow’’ but-
ton on the bottom right side of the faceplate which controls the volume of the built-in speaker-
phone. The left side of the VOLUME button lowers the volume; the right side of the button raises
the volume.
The 7406 Plus (7406D07A and 7406D08A) voice terminal also has a VOLUME ‘‘arrow’’ button on
the bottom right side of the faceplate. However, this button has a double function. When the
user is using the speakerphone, the VOLUME button controls the volume of the speakerphone;
at all other times, the button controls the volume of the tone ringer.
If the 7406BIS or 7406 Plus voice terminal has a display (the 740605A and 7406D07A voice ter-
minals only), the display will show a ‘‘bar array’’ that indicates the volume setting.
Self-Test
Two of the 7406D voice terminals (the 7406D03A and 7406D04A) and the 7406BIS voice termi-
nals (7406D05A and 7406D06A) are equipped with a self-test. On these voice terminals, the
Self-Test feature is performed by pressing the SHIFT button and then the DROP button.
With the 7406 Plus (7406D07A and 7406D08A) voice terminals, the user presses the SELECT
button and then the DROP/TEST button to initiate a self-test for the voice terminal.
During the self-test, all the lights go on, the ringer sounds, and, if the voice terminal has a
display, the display characters are lit. The self-test ends when the user releases the DROP or
DROP/TEST button.
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