Bobby I don't know if this would work for your situation, but about a year ago we were troubleshooting a problem at a remote site and needed to monitor the SMDR locally. Fortunately all our client sites are connected to us by VPN. We simply had the computer that was connected to the cabinet write the SMDR log to a shared folder on one of our machines here by static IP. Another option that comes to mind would be using the Scheduled Tasks Manager to run a bat file every night, and have the bat file copy the SMDR text file to the location where they do the ASCII import.
Added: After writing this I realized I may have misunderstood your original post. Obviously if you have no machine connected to the cabinet, and were looking for an IP interface from the cabinet to go directly across the LAN this wouldn't really fit your application.