I don't know if I can help much ( I am much more proficient on the Strata CIX line). I don't believe that I have installed a door phone on the Strata DK

Per you other posts you already setup prg 79 and *79. Is the destination to a Phantom DN (PhDN) port 500?

Also on your first message, you said that you have the phones ringing on button 00. You didn't replace the phone's Primary DN (PDN) did you? All the phones need a PDN to work. You can't call a phone that doesn't have a PDN key.

This is about the extent of my help that I can offer for this system. Hopefully someone more experienced on the Strata DK system will be able to offer more guidance.