I have a customer with a BCM50. We installed a door phone as well. I try to program a hotline for the door phone to ring to a specific DN in the system and the programming will not stay. I have it set to internal and put in a DN (232) and when I go back in to look at the programming it changes it to a "direct dial set". I can't get it to stay with the DN. I have tried to program a hotline on other stations as a test, and they all do the same thing, changing it to a direct dial set. Any ideas?