No multiple call groups or ring groups exist on the DK. You cannot make an slt ring in conjunction with a dkt/ekt set, but you can make a dkt ring in conjunction with an slt. That's because in prog 39, you can place an SDN on a dkt/ekt but you can't program an SDN on an slt. In your situation, I would advise against it because you wouldn't want to target a single-line phone if you expect to recieve multiple calls. But if you wanted to... Prog 71 target the port of the cordless. Prog 39, place a SDN appearance of the cordless on the front desk phone. Prog *71 assign ringing of cordless to desk phone port.