AT&T Co has come out with its first multi-line cordless telephone for business: the Merlin, designed by AT&T Bell Laboratories, has five programmable buttons that can be used for telephone lines or system features, such as intercom and speed dial, and visual indicators show the status of the lines; users can pick any one of 10 channels allocated for transmitting cordless conversations to assure clarity; compatible with all Merlin Plus, Merlin II, Merlin 206, 410, 820, 1030 and 3070 Communications Systems and AT&T System 25, the phones are $485 when you buy an AT&T phone system, $560 when bought alone.