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Originally posted by Johnny Cakes:
I've done a lot of research but can not find a Internal station to station calling after dialing 9 (or some other digit)
There is no DIGIT (0-9) that does not begin some public phone number. However I once programmed a system that would connect you to an extension if two or three digits were dialed and then no other digit was pressed for five seconds. If you had such a system, you could dial 310, and then just wait five seconds. Then it would connect you to extension 310.

Jonny Cakes, My impression is that you want a phone system that seems like an ordinary home phone to guests, but that you could make do special things by using special codes. Is that right?