Can Any One Tell Me Any Good Topic in VOIP(voice Over IP ),Since I Need to Do an Coursework on That?

You need to head over to voip.com, because they have this whole repository of voip articles, tips, a blog...just a ton of content about all kinds of voip topics. Here's a bit of what they have:

-Articles:
-Adjusting the sound for voip in Windows
-Pulver's Proposition (about voip's role in disaster communication)
-WiFi on the Go (using WiFi to make voip calls)

-Blog covers info on things like:
-wireless bridges
-all kinds of voip equipment
-innovative voip applications
-current events, etc...

There's also a good help section, a bunch of tips, and informative press releases. Hope this helps