Usually this is taken care of by the videoconference service company that you are dealing with. Rather than thinking of the software you need think of the functionality that you would want from your videoconference.
If you just simply want to broadcast yourself on video to your colleagues and allow them to talk back then that is relatively simple.
However, if you wish to offer visual aids in the form of PowerPoint presentations or allow attendees to share ideas using something like Mshow, then a more complex solution is needed, especially when working with larger audiences.
Once again it is recommended that you work with a video conferencing service company that is capable of providing the software and features that you need. Most companies will be able to offer you an interactive demo which you can see before purchasing.
Next: Organizing a Video Conference
An introduction to Videoconference Services:
1. Videoconferencing can get complicated
2. Video Conferencing Equipment
3. Videoconference Software
4. Organizing a Video Conference
5. Videoconference Service Companies
