currently my doorbell (analog door phone and Linksys PAP2T) is routed through LMCE0810 as a normal ext (994). I have a dialling scheme that calls a ring group (600) which in its turn rings all my extensions.
This 0810 system is only still there because I can't get the door phone working on LMCE1004. The wiki has not a lot of info (only to add the door phone as ext 994 and make sure the room is of the type foyer/entrance.
What I did is I added a new phone, after creation I gave it extension 994. I placed the extension in my room "Hallway", that is of the type Foyer/Entrance. And that is were it stops. If I press the button at the front door, the phone goes off hook, I get a dial tone and shortly after a busy tone and then Asterisk hangs up.
Maybe somebody is able to give some hints to what I have missed.... (And yes I almost read every forum message of wiki page that contains door, door phone or doorbell