AT&T 7406BIS Telephone User Manual


 
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.