Besides, Google Talk, Yahoo, MSN and Skype, what other programs are there for voice chats which is reliable and doesn't use require much bandwidth? I'm asking this because the above programs that I've mentioned are banned in some countries.
Well you could try Gizmo, it's better then Skype.
Also, if you're planning on using it for gaming, you could try programs like TeamSpeak.
These are a lot more cut down that VOIPS, and designed for channel talk, so you can have say 50 people in one channel, but it's not an open chat type channel.
Thanks guys. I'll ask someone to try these out in their country to see if they are banned.
Also with TeamSpeak, do you need to install it with a game?
Voipstunt, Globe are also there for Voice chat.
Skype is definitely your best bet. If your looking for low bandwidth, then Teamspeak/Ventrillo will work. There's a pretty cool one called KDX, but it is shareware and a little different from the rest.