Version 3 of the free TeamSpeak software lets you communicate with the other players via headset during online games. Thus, you will know, for example, where your friends are in a tactical shooter.
TS3 uses the codecs CELP, GSM and Speex that offer a bandwidth of 5.1 KBit/s up to 25.9 Kbit/s. This saves the online connection without having to put up with audio quality losses.
To use TeamSpeak, you need to log in on a TeamSpeak server with the client software. Of course you can also set up your own server that you can administer conveniently with a web user interface.
There are a lot of features such as an address book to administer various servers or a whisper function, which don't leave you wanting. Unfortunately, the free tool is not compatible with VoIP yet. To use TeamSpeak properly, you need a headset or a microphone and speaker.
Version 3 not only comes with a more modern look but also offers improved speech quality and latencies as well as a few comfort functions. You can find the official changelog on the site of the manufacturer.
Verdict: The ultimate communication tool - not just for gamers. A 64 bit version is also available.