You can make a .wav file of them, but it's tricky and takes a little practice.
You need to have access to an AVAYA Communication Manager PBX with Intuity Audix and Message MANAGER loaded on a lap top computer. From the AVAYA CM call into the Merlin Messaging like your going to listen to them, mute your phone and just as your about to listen to the message hit the "Record a Call" button which records the original message into a mailbox in the INTUITY. Then open Message Manager on the laptop, log into that mailbox, convert the message to a .wav file. Once that's done you can put it on a disk, thumb drive of email it to someone..
Hope that helps.
Mike