Das habe ich gefunden:
Teamspeak2 ca. 10 Gb Traffic pro 20 slots im Monat
Aus der murmur-Dokumentation:..."the peak bandwidth is 65kbit/s per speaker per listener (with IP and UDP overhead). In other words, a server with 10 users and 1 user speaking will need to replicate the datastream 9 times, for a total of 659=585kbit/s outgoing bandwidth. If all 10 users speak at once, each stream has to be replicated 9 times, for a total of 65kbit/s9*10=5.8 Mbit/s. Note that these are absolute worst-case scenarios, and the average bandwidth use is around 20-30 kbit/s during speech, multiplied by the number of listeners."