I know this one, well part of it. Ok what you need to do is run you a jumper wire from a TRUNK port on the Norstar to the main admin telephone card in the Dukane MCS350 (the one with the fuses on it). I can't remember exactly what pin's to connect to on the admin card (you know there are 6 pins on it) i wanna say 3&4 but don't hold me to that. Then what you would do is program a phone with the line that is hooked up to the Dukane MCS350, press it and you should get the MCS350 dial tone, from there if you wanna do an all call, i believe it is *2 (its been a year since i did it) and if you wanna call the indivial speaker line, then press the line, then dial the number programed for that speaker line then after a pause you should hear it go "ding" and then you can talk on it. And if you wanna hook up the Norstar to a Dukane StarCall, then run a jumper wire off the trunk port of the Norstar to a STC port of the StarCall and then you should get the Starcall dial tone.