The following optional modules are compatible with the 7406 Plus voice terminal:
500A Headset Adapter
Provides a dual-purpose switch that turns on the adapter
connecting the headset to the voice terminal. Pressing the
ON switch is equivalent to going off-hook with the handset,
and pressing the OFF switch is equivalent to going on-hook
with the handset. Plugs into the speakerphone/headset
adapter jack.
7400B Data Module
Provides data capability to the attached DCP voice terminal.
It also provides integrated simultaneous voice data
communications over standard twisted-pair wiring. Plugs
into the line jack.
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. Plugs into the speakerphone/headset adapter jack.
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