Ventrilo

Ventrilo ('Ven' or Vent for short) is the voice-chat software also known as VoIP (Voice over Internet Protocol) Ventrilo. It allows vocal communication between players during gameplay. A client / server application that runs in the background allows players to discuss strategies and tactics in realtime, even during the battle, without time consuming typing. As communication is a huge factor on the effectiveness of a team, Vent is often considered a necessity for serious PvP.

Using this program can be very effective for team PvP, GvG, and the Hall of Heros. Anyone can host a server, the download is on the Ventrilo website. The only thing is port '3784' needs to be open to the hosting computer and that is all, then others can join.

Another popular voice-chat program is Teamspeak.

Note: This software is not officially sanctioned by ArenaNet.