Features6 Call Appearance/Feature Buttons15 Exclusive Feature Buttons2-Line Supertwist Display2 Headset JacksAdjunct Jack used for connecting compatible adjunct equipment such as an S101A or S201A Speakerphone, a 502A Adapter, or a 500A Headset AdapterOther buttons include: Drop/Test, Conference/Ring, Hold, Transfer, Release, Log in, Mute, Volume ControlIncludes RefurbishedLibrary Callmaster II and III user guide.pdf
