This is sounding way too complicated way too fast. Your description is a bit vague. If 505 is a station group, then it would be normal with overflow to bi-vms group of 519. You then put rules in the vms so that 505 will route properly to either main menu or vm mbx, etc. It sounds like you have 505 ovfl to 519 then there is a mbx for 505 so that you are getting the generic greeting for 505. You have not set your routing yet in the vms.