TeamSpeak is a quality, scalable application which enables people to speak with one another over the Internet. TeamSpeak consists of both client and server software. The server acts as a host to multiple client connections, capable of handling literally thousands of simultaneous users. This results in an Internet based conferencing solution that works in a variety of applications such as team mates speaking with one another while playing their favorite online game, small businesses cutting costs on long distance charges, or for personal communication with friends and family.
Of course GTG OldTimers has it's own server, which you can easily connect to, following these simple steps.
1. Download TeamSpeak
Client 2.
2. Install the package anywhere on your computer and open it up.
3. Click on "Connection" up in the left corner and "Connect". Right-click under "Servers" and click "Add Server".
Name it OldTimers or whatever you like.

Highlight the new server and take a look at the right.
Label:
The name you just entered for the new server.
Server address:
Here's where you input the IP-address of the server you want to connect to.
GTGOldTimers IP is:
64.86.25.180:8003
Nickname:
Type in your desired nickname on the server.
Mark the "Anonymous" dot and leave the login information blank until you're connected to the server. Then ask a Server Administrator to allow you to register your nickname.
Rest of the fields should be blank as well.
Here's a picture of how it should look like.
For all sort of troubleshooting, post a thread here or read the FAQ in
TeamSpeak homepage.