We have experience in many kinds of web, video and telephone conferencing. Some methods are much easier, cheaper and more reliable than others and some are obviously less so. Most people don’t really know the difference between these methods. In fact, there isn't really a standard definition for each as everything is still developing so quickly at the moment.
The current ‘trend’ is for collaboration and inter-operability between these different systems and this can work with varying degrees of success. The Internet has made these types of communication more accessible but the Internet is not always appropriate.