The Definity 8405 Basic phone comes with a listen-only speakerphone, Conference, Mute, Speaker, Transfer, Shift, Drop, Hold and Test. The phone provides access to multiple lines for call handling, call coverage, bridging, conferencing, and more.


  • 5 programmable call appearance/feature buttons
  • 9 fixed feature buttons
  • 2-way speakerphone
  • 5 call appearance/feature buttons
  • LED Message Waiting Light
  • Conference, transfer, mute, and hold built-in
  • 2 and 4 Wire Connectivity
  • Two Way Speakerphone
  • Avaya 8405B Non Display Digital Set Requirements

System Requirements/Compatibility:

  • 2-wire TN2181 16-ports circuit card for DEFINITY G3V2 Systems and higher
  • 2-wire TN2224 24-ports circuit card for DEFINITY Release 5.0 and higher
  • 4-wire TN754C circuit card for System 75 and earlier DEFINITY communications systems