Avaya Definity 7410 D02 Plus Phone (Black/Refurbished)The Avaya Definity 7410 D02 Plus Phone is a phone that is compatible with Model S201A Speakerphone and it requires an available port on Digital Circuit Pack TN754B. Key Features: 7 Feature Buttons including Conference, Transfer, Drop, Select Ring, and Hold. 10 Call Appearance or Flexible Feature Buttons Message Waiting Indicator Adjunct Jack for Headset or Speakerphone Can access multiple lines for handling calls One Way Speaker Conferencing Call