Hey can someone help here I currently have a customer who has a 3904 with 2 22button add on mods for bfs keys at the receptionist. They now are maxed out. Question can you only have two per phone I think that is what I have read just trying to be sure. Any ideas this site is a shared switch meaning that we have about 400 stations and approximatly 18 different customers. This one customer is looking at adding about 15 new extensions.