• 6 Call Appearance/Feature Buttons
• 15 Exclusive Feature Buttons
• 2-Line Supertwist Display
• Built-In Recorder Interface allows you to connect a recording device for recording all voice interactions
• 2 Headset Jacks
• Adjunct Jack used for connecting compatible adjunct equipment such as an S101A or S201A Speakerphone, a 507A Adapter, or a 500A Headset Adapter
• Other buttons include: Drop/Test, Conference/Ring, Hold, Transfer, Release, Log in, Mute, Volume Control

Fully remanufactured with one year warranty.
AVAYA part numbers Callmaster 4, Callmaster IV, 317940, 3179-40, 317940B, 3179-40B, 108010554, 603F1