Teamspeak or other voice communications in game

I read that the collector edition provide you with a headset, I am guessing that is designed for teamspeak.

May I ask how does it work in the game? When you are in a party, do they automatically able to hear your vioce?

TS is usually used by guilds. You need access to a particular TS server via their pin/ip# and a password. Depending on the type of TS that is set up, there can be multiple channels. At that point you can chat with each other. I prefer multiple channel TS for Guilds that like to PvE, GvG and TA. A big guild can utlize all of these channels at once without it being overcrowded. It makes co-ordinating your actions so much easier...IMO.