Mitel 50000380 5020 IP Phone (Black/Refurbished)Key Features: Mnfr. Part #: 50000380 Built in speaker Handsfree operation (half duplex) 2 line, 20 character backlit display with contrast adjustment Context sensitive softkeys for feature set customization Phonebook Volume Ringer Control CLID (Caller ID) Off hook voice announce On hook dial 14 programmable multi function keys (for speed dialing, broadcast groups, line appearances, feature access) 8 function keys: hold, superkey for feature access,