Dial into Voicemail from one of the systems and record a message.
When selecting the target extension, enter an extension from the other system as specified in the VPNM Preferences screen.
The message should be delivered to the other systems Voicemail Pro server into C:\\Inetpub\mailroot\Drop.
The VPNMreceiver Service checks the Drop directory approximately every 30 seconds. When it finds a message in the Drop directory, it will send the message to the relevant extension's voicemail box on the remote system.