AT&T 7406BIS manual S101A and S201A Speakerphone

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.