Update - Thanks for all the responses. The customer took the IP phone home, plugged it in and it worked just fine. This tells me that the problem is in the router at the model home office. The "IT Guy" is going to look at it tomorrow and let me know what he finds.

Now available Voicemail Programmer Kit to program your Toshiba Voice Mail across your network.

Toshiba Technical Support at: One Ring Telecom