The AT&T Merlin telephone system was first introduced in 1983 and these workhorses are still in the field at many small businesses and to this day we get a fair amount of customers looking to replace their dead or malfunctioning control units. The fact of the matter is these things are getting hard to come by. If you are someone who has a Merlin phone system, you may want to consider upgrading to the Avaya Partner ACS. The Partner ACS is designed so that you can easily upgrade your phone system in literally minutes. To show how easy it is, we put together a video that shows how anyone can upgrade their Merlin phone system and start enjoying one of the most popular small business systems around.