Nortel M5316 Business Telephone Black (Nt4X42Ca)Brand New M5316 Black Phone comes with power supply and 3 year warranty.Features of Nortel M5316 Business Telephone Black (Nt4X42Ca) 13 programmable line/feature keys 2-line X 24-character liquid crystal display During the conference call, use the Mute key to confer confidentially with another person ..