Not all cableco's can work with such setups. They have opted to integrate with their own proprietary DVRs.
I just went to upgrade my digital cable service to HD at my local Time Warner Cable center. I asked for the cablecard instead of the standard cable box and she told me I wouldn't be able to get on-demand viewing or the tv listings screen which is fine b/c I only order an occasional fight or UFC via PPV and rarely movies; but I do like having the tv listings screen. My new plasma has TV Guide On Screen capabilities which would take care of the tv listings view that I like. Anyway, I was told that I wouldn't even be able to call-in PPV movies or sporting events b/c the cablecard doesn't have that capability, which I thought I would be able to. I knew I wouldn't be able to order PPV items on-demand with the cablecard, but I definitely thought I could call customer service and do it that way, which is not a problem given that I rarely order PPV things.
Is this true or was the woman at Time Warner misinformed?