We recently aquired a Merlin Magix to our sites. I know notning about them so any help at all would be appreciated. Presently I have to change an extrension number and add features to a 4406D telephone. There is no 4424D= set that I can see by the PBX to use. Can I use any 4424D set to do this or can I do this from the 4406 set...As you can see I need some help and or some documents.....Thanks in advance