Greetings,
I just replaced an IDCS 100 with an os7100. The only phone I wasn't shown during the walk through is a Prostar 12 button set with what I guess is a single line card in the phone that goes to a cordless single line phone. My question is can that work with the Os 7100? The Prostar set works but when I plug into the what I believe to be a single line port I hear digital "Wash" tone on a butt set. Is this programming or just a non-compatibility issue?
TIA


John 807