I have a spa9000 connected to a spa400 with four pstn lines that were part of a VERY old phone system. Everything is set to my liking except that it takes about three rings before the spa system sends out a ring to all our phones (942s). I have read the manuals thoroughly and can't seem to find what the problem is. The spa400 indicates incomming calls instantly. This was a problem from the very begining, so it must be a default or hardware problem.