AT&T Callmaster Series Reference Manual page 509

ISDN 8510T Voice/Data Terminal
Speakerphone (Listen and Speak) Feature
The 8510T voice/data terminal is equipped with a built-in S201A-type speakerphone. The
Speakerphone capability allows a user to engage in a hands-free 2-way conversation with the
far-end party. The speakerphone can be turned off or on with the SPEAKER button; it can be
muted with the MUTE button, and the volume can be controlled with the VOLUME ''arrow'' but-
ton.
With the softkeys, the user can adjust the speakerphone for optimal performance. The user
hears a set of tones as the speakerphone performs an acoustic test of the environment. When
the tones stop, the speakerphone has finished adjusting itself and is ready for use. The user
should reset the speakerphone whenever the voice terminal (or the table or desk on which the
terminal is situated) is moved to another place (even in the same room).
Speaker (Listen-only) Feature
The 8510T voice/data terminal can be optioned for the Speakerphone (listen and speak) or the
Speaker (listen-only) feature. (The voice terminal is shipped with the Speakerphone setting in
place.)
The Speaker (listen-only) capability allows a user to engage in a one-way conversation with the
far-end. The user can only listen to the far-end; the user is not able to transmit his voice over the
speaker. Use the SPEAKER button on the front of the voice terminal for turning on and off the
speaker or speakerphone. To speak with the far-end, the user must use the handset. Lifting the
handset turns off the speaker.
MUTE button
While on a call, the user can press the MUTE button (the red light next to the button goes on), so
the user can converse with someone in the same room without the other party hearing the
conversation. The user is placed in listen-only mode. To disable the feature, the user presses
the MUTE button a second time (the red light goes off). The Mute function works only with the
handset or with the built-in speakerphone.
EXIT button
The EXIT button is used for exiting a softkey feature and returning to Normal call-handling Mode.
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