Overview
Definity Callmaster IV features:
6 Call Appearance/Feature Buttons
15 Exclusive Feature Buttons
2-Line Supertwist Display
2 Headset Jacks
Adjunct Jack used for connecting compatible adjunct equipment such as an S101A or S201A Speakerphone, a 502A Adapter, or a 500A Headset Adapter
Other buttons include: Drop/Test, Conference/Ring, Hold, Transfer, Release, Log in, Mute, Volume Control