Here are notes on VoIP taken by one of your classmates.

Here are some other VoIP web sites
The FCC web site on VoIP. This gives a very high level description.
Here is the wikipedia entry on VoIP. It has a lot of good information as well as links to other sites
The Vonage Home Page
The askterisk home page
VoIP, General Info
E.164 numbers and DNS
RTP: the Real Time Tansport Protocol

Here is the Virtual Reality Power Point Presentation

Virtual Reality E-Commerce links and notes This has links to a number of Web Service sites. You should take a look at some of these.