Avaya XM24D+M Expansion Module:

Definity XM24D+M Expansion Module

• The XM24 is an add-on unit that works in association with a 6416 or 6424 display phone and provides an additional 24 programmable call appearance/feature keys with twin lamps. Only one XM24 per 6416/6424.
  
  

  Part Number: 108544511, 108544503