Avaya Lucent Partner 18D Euro Series II 18 button speaker and display telephone. Alternate part numbers for this model include 700420011, 700340219, 700340193, 700368624.
Features:

Backlit Tilt Display 2 lines x 24 characters;

16 programmable buttons with dual LEDs for line/feature appearances;

Fixed buttons include intercom, hold, transfer, conference and speaker;

Full Duplex (two-way) speakerphone;

Volume up and down buttons;

Message waiting indicator;

Built-in extra jack for connection of single-line phones, fax and answering machines;

Adjustable desk stand;

Wall mounting hardware included:

Compatible with Partner, Parter Plus, Partner II, Partner ACS phone systems.