대략 사용량은 ADSL 인 업로드 70k 정도 나오는 환경에서 15~25명 정도는 사용이 가능합니다. http://www.teamspeak.com/?page=downloads

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Teamspeak 3 has a cleaner/prettier UI and is easier to use, but if you want more than 32 users on your server be ready to jump through some hoops to get a license. Mumble is open source and completely free to have unlimited users on your server, so I personally prefer Mumble just for that reason alone.