This has been asked before, but rarely answered. There are often responses like, "that depends." Well obviously it depends, but that answer is not terribly help full. Perhaps some higher volume Teamspeak/ Ventrilo hosts will be able to give a better answer.

Based on a significant period (to reduce standard deviation), what is the average bandwidth usage of 1 slot? Not total, average (given that not all slots are used all the time). The more slots you have on license, the more accurate that number will be. Also, I'm asking for bandwidth, not data throughput (it a pet peeve that people, including web hosts, confuse the terms).

If your servers are not on unmetered bandwidth, but you have throughput quotas instead, what is to average monthly throughput of a 1 slot.

Thank you so much for helping me out with this information.

I'll leave it to someone else to give you marginal #'s per slot, but to keep it general - Ventrilo uses loads of bandwidth, Teamspeak uses virtually none. The trade-off is that Ventrilo takes almost no server power to run, Teamspeak takes quite a lot in comparison. If you have a Ventrilo license and are just starting up a server to host it, not knowing how much you need - I wouldn't worry about bandwidth yet. Most hosts never grow large enough to use even the typical 2000 GB that most providers throw out there on a dedicated server.

I'll leave it to someone else to give you marginal #'s per slot, but to keep it general - Ventrilo uses loads of bandwidth, Teamspeak uses virtually none. The trade-off is that Ventrilo takes almost no server power to run, Teamspeak takes quite a lot in comparison. If you have a Ventrilo license and are just starting up a server to host it, not knowing how much you need - I wouldn't worry about bandwidth yet. Most hosts never grow large enough to use even the typical 2000 GB that most providers throw out there on a dedicated server.

I'm looking for information to possible provide hosting of Teamspeak and vent servers. As such, I need specific information to determine costs, possible margin and ultimately, help determine product viability.

well what kind use are you going to be using it really? this is a major factor cause sometimes you can find hosts who allow it since people have clan sites and want everyone to be able to talk and teamspeak is a good way to go about it.

So what you want is for someone to share the # of slots they're hosting vs. 95th percentile traffic?

ventrilo (unsure of teamspeak) bandwidth relys on what codec is used. the higher the codec the more bandwidth used. this is why "fly by night" vent resellers sell dirt cheap because you sound like your underwater while being taped by a monkey from behind.

Quoted direct from ventrilo.com- http://www.ventrilo.com/setup.php
Bandwidth usage will be determined by what codec the server instructs the client program to use. The default configuration for a server is to use the GSM 6.10 codec and sampling at 11Khz. After compression this will consume approximately 3K bytes per second per voice stream.
Using the 3K bytes/sec example this will translate into the following numbers. If you are in a channel (not to be confused with a server) and there are 3 other people in the same channel as you:
One of the other people talking will produce 3K bytes of inbound data.
Two people in the same channel talking will produce 6K bytes of inbound data.
Three people in the same channel talking will produce 9K bytes of inbound data.
And so on....
As you can see the mathematics are very simple.
The outbound traffic coming from you and going to the server will remain constant when ever you are broadcasting. Using the default codec you will produce approximately 3K bytes/sec of outbound data.
If the server administrator chooses a different codec and sample rate then the bandwidth utilization will change as well. It might be higher or lower but only the server admin can control this.Im in no way promoting this next link!
on this providers website it has a screenshot of some of the codecs and there rates, again in not recommending them, i have never used them before and only stumbled across it to show you the codec screenshot!
http://www.instantventrilo.com/support/ventrilo-server-change-codec.php

I know your looking for specific numbers but without knowing the varables noone can give you the "set in stone" answer your looking for, however using the above info and after figuring out the codec your going to use or what ones to offer you can calculate each slots useage. hope this helps

Just if getting a ventrilo licence...