These do not operate on other Avaya, Lucent and ATT telephone systems even if they have the name Merlin in them. Make sure you are using MLX Model phones on the Merlin Legend system. Quantity'2' would get you two phones. The item "1 Refurbished Merlin Legend MLX-20L Black Phone (Avaya Lucent MLX 20L)" is in sale since Sunday, February 28, 2016.This item is in the category "Business & Industrial\Office\Telecom Systems\Business Phone Sets & Handsets". The seller is "usedphonesforless" and is located in Rochester, Michigan. This item can be shipped to United States.