I beleive that the Partner Mails are CP/M based. Try this: connect to the serial port using a null modem cable, at 1200-N-8-1
Hit return, and when prompted for a password, enter "p1zza" and return without the quotes, and note that it's a ONE, not an EYE. It that comes back as invalid password, use the 6-digit serial number on the unit.
You will get a menu that allows you to capture a configuration report, shut down the voice mail system, test the cards, test the memory, and restart the system.
A couple of times, I have seen them drop to a C: prompt, and could do a dir command, but had no idea what the files and commands did, and didn't want to screw up a customer's system.
The time that I had Lucent's engineers logged in via modem, and testing for a problem, they were able to see all the traffic on the voice mail, including digits dialed, response of the voice mail, etc. They wouldn't share the commands with me, and I still don't know what the ultimate solution was. I have a customer out there who purchased a 308 card for a new ACS, but still has a 206 card instead, because of some incompatability in the early 308's.