Time slots sometimes have to be booked well in advance. With desktop systems, more impromptu and informal interaction can take place. Users will be more likely to use a system if they have easy access to it. The importance of good quality audio in a conference can not be overstated. Since not many of us can read lips, effective communication can not occur without intelligible audio.
Audio delay can make interaction difficult.
Audio that is not synchronized with video can be distracting. The value of video Intuitively, it seems that video adds value to a conference. Video enhances communication by creating a sense of presence. Video allows for communication through gesturing. Objects can be shown to other participants by holding them up in front of the camera.