We have just installed another merlin magix system and we are trying to link two systems together using 400 e&m modules, we have had the phone system up and running for quite some time but we can not get the 400 e&m mod's in the two system to work and we have read the instruction in the manual, contacted other istallers and the dont have clue or havent worked with the 400 e&m module before, if anybody can be of any help thank you