Ok you need to get into programming ie transfer then xxx then the passcode then 1 to enable after that you need to go to mmc xxx and check to see which trunks ring were ie xxx rings 500 day and 501 night write these down we will need them later.Hit your speaker then dail xxx if the trunks ring at the xxx operator group xxx if they ring any other group you can change the overflow timers in there or the stations they ring. If the trunks just ring stations hit the speaker key and dail 104 then dail the station that rings and use your volume keys to scroll through and change the forwarding options there.