Hi Broadsider,
Unfortunately the 1000 and 2000 videophones are not compatible with Broadband Voice.
Broadband Voice is the business VoIP service and Broadband Talk is the residential consumer equivalent.
You will be able to use your videophone at home, provided that you have BT Total Broadband and Broadband Talk. Alternatively, you can download the free software client BT Office Communicator through Webcare https://service.btbroadbandvoice.bt.com/selfcare/businessYourAccount and make your business video calls over the internet that way.
I hope this helps.
C.