Its simple, all KDF players should have both Ventrilo and Teamspeak installed on their computer. You never know which one will be available for team voice comms.
For instance, I always have TeamSpeak3 running, 220.127.116.110 :10027. Its always on(yes, always) and Im always annoucing it in PvP so it can be utilized.
Some people likly have big servers, mine is small(only 10 at a time) with two channels...but you cant participate in voice comms if you dont have the client...so get them all, you never know which one will be available for any given match.
Mine is open to all Klingon PuGs, just feel free to make yourselves at home on it.