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...the phone I called them with will still have ring back tone on it like it has been forwarded somewhere.
I fail to see what you mean by "ring back tone"on an intercom.

No matter where the call went, you'll have inercom dial tone when you pickup the handset.

If you're holding the handset, or using H/F, what are you "hearing" after the 4 rings?

Dave


Scientists say that the universe is made up of Protons, Neutron & Electrons. They forgot "Morons".
Dave. (CTUB) Canadian Techs Use Bix!