funny you mention the word "teamspeak", cause that is exactly what the program is called, i guess you got lucky there eagle :P
Teamspeak homepage
This requires that someone hosts a server and you connect to it, I have friends who have servers and i connect to them so this is not a problem for me, however if you don't have a friend who is hosting one then you might be able to join a random one and hope no one notices so you can talk there, or you could just join a public one and make a seperate room.
There is also another chat program called "ventrillo" and can be found here:
Ventrillo
I much prefer teamspeak to ventrillo though, as it looks better, and the website looks much more professional
