We are setting up a 3904 with 5 keys in hunt and we are having trouble getting this to work. We have set up LHK set to 5 and have hunting enabled and set to 000. When we call the first line of SCR 7811 and answer then call SCR 7811 again, we want it to roll to scr 7812 and so on. What we are getting is a busy signal..We would like to make this work without programing a bunch of analog lines that hunt to each other.