My company is currently running the Telrad IVM Voicemail Version 4.000 . My Question is we are looking for a backup system, just in case the one we have goes down. I have found a system That is running Version 3.000 . To upgrade this system to 4.000, is it just a matter of installing the version 4.000 software or is there going to have to be some hardware changes also? The system we are running is an eight port system and the system we are looking to purchase is an eight port system. Thanks for any help!

Thanks,
Keith