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.
Communication
TeamSpeak use UDP port 8767 by default. Server can also indicate other ports for the clients to connect.
How to block TeamSpeak?
Because the port isn't fixed so you can not block them only by
disable the ports in the firewall. We recommend you to block TeamSpeak in two ways:
1). Block all TeamSpeak server IP address. Find TeamSpeak server IP address and block all the server IP address.
2). Use firewall which has deep content inspection capabilities. Use firewall which has deep content inspection capabilities to block TeamSpeak's P2P function.