The bcm pbx uses a proprietary engine called thenordx110 wich even dough it is linux based it stil has to be converted to rcpd format once that done then its plug and play,the easiest way to connect to the bcm 50 is by dyndns wich is free but you must register with nortel then you get log in's in your bcm works with the mac adress of the pbx when your unit is online make sure your ccr tree is up to date.
good luck