Thanks for the info, when I look under mmc 406 it shows everything is pretty much ringing to ring plan 500 there are a couple of items that ring 505, but this is just a ring plan that lists 3 extensions which ring in sequence. There is nothing under mmc 406 pointing to 519.

They currently have a little unit plugged in to the officeserv box, which has a USB flash drive plugged in with the recorded message for the auto-attendant sytem. Device manager shows the software version of the officeserv box is V4.14.0, not sure if this has any bearing though on how the auto-attendant would be setup.