So finally got an outside number for our PBX system. The problem we are having is the Ring group is set for 18 seconds which is roughly about 3 rings and then is suppose to go to a second group number that will add more extensions for another 18 seconds and then go to a third group which is an external cell number. When we dial with the outbound number, it comes into our Ring Group however after the 3 calls it hangs up and does not forward to the other ring group. Our settings look correct. Any direction as to what I may be missing?