AT&T 7406BIS User Manual
Page 10
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S101A and S201A
Speakerphone
Provides total voice terminal operation without using the
handset. Turning on the speakerphone is equivalent to going
off-hook when placing or answering a call and turning off the
speakerphone is equivalent to going on-hook. A mute switch
is provided to temporarily cut off transmission to the distant
caller.
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