system speed is a single list that can be built and shared system wide,, station speed (ss) can be for a single station or a dept.. the u is for user the c if controller. only the controller has edit allow..
i have ssc 80 on my 3904, all the other sets in the switchroom have ssu, they can press the line, then the ssu key then the 2 digit code
john poole
bellsouth business
columbia,sc