AT&T Merlin telephone system. This is a trade-in system that came back to our inventory this week. The AT&T Merlin system has 7 – 10 button speakerphones and 1 – 22 button speakerphone, The main box is equipped for 8 line and 20 extensions. Installation, programming, cabling is available on a hourly basis. 20 % off the system and installation if your are a non-profit company.