Technology has evolved again. I've been doing MSN messenger with my mum with audio and video for about 24 months now. This is all great technologies and great video quality [especially with Logitech camera] since we have broadband on both end. The problem is since she don't know how to operate a computer, she have to rely on help from my sibling.
Recently, we bought SIP phone (search for "SIP Phone" on MSN Search). It's a hardware-based just like a conventional telephone and it's just so much convenience and no more IDD calls or calling card. If your computer is turn on 24x7, you can also have a SIP software.
There are also higher-end SIP hardware that comes with camera and lcd display. For now, I'm fine with what I have.