Use program code 98 to determine what specific version your system is. There is a date code embeded within the string. The format is as follows:
XXXXXYYMMDDX(tm)
You are looking for a date that is April 8, 1993 or later.
Ex: L334Z930408A(tm)
To integrate the PBX to the VM, you need to change programs 80, 81, 60, 08, 09.
Use a butt-set to enable data line security on all VM ports. Code 7301#
On each phone dial 7192# to turn on follow-on ID. And set call forwarding to VM on each phone (optional).
Also, in regards to the Message Light, I leave the "Light Off Sequence" in VM programming blank because when users press the button to check messages, it extinguishes itself.