Merlin was a corporate telephone system developed by AT&T and introduced in late 1983, when it was originally branded American Bell Merlin. After the breakup of AT&T in 1984, it was rebranded just as Merlin and supplied by Lucent, and then Avaya. If your business is still running on a classic Merlin Classic phone system and you are having difficulty finding anyone that can provide you with help or support, Merlin Communications is here and ready to help.