Yes, 3 minutes is excessive. I would look a the port setup on the ports to the Def-audix. Version 4 takes up 3 slots, two for physical boards and the one slot, on the left, is reserved for cooling. You should have all 16 ports programmed, even though you may not have purchased the RTU for all 16. The last port programmed is the port that turns off and on the MWI lights for the voice mail system. Double check ther programmig on the ports, I suspect that there is something set up wrong. Hope this helps.
Thanks
Chris