I think he is asking about where TV is delivered to your house over IP, as far as I know it you have a special box that does the decoding etc for viewing on the TV.
You don't necessarily need custom hardware and you could certainly interface to a IPTV service from a technical perspective using lmce using software and suitable video hardware. I think the issue is that as it stands lmce does not have any UI to allow for services delivered this way... but a UI could certainly be added to support such services.