From a quick read of the Ventrilo terms etc, it seems that they will not sell you a license.
They will only sell for 1000 slots or above, and not to people only wanting only 1 or 2 servers.
They recommend you buy from one of their re-sellers in your area.
Apparently I was being too subtle. The reason I'd posted the link to their forums is because that's where the most logical place is to find the answer.
Think of it as a "let me ****ing google for that you" link, but slightly more polite.
I do forget that being subtle doesn't work around here though.
A second alternative would be to use older versions of the software that do not come with such silly restrictions. What you want is Ventrilo Server v2.1.2 and Ventrilo Client v2.1.4.
Maybe I'm thick, but they had both the client and server 2.xx downloadable on their site and one could just keep using them. So how's that different? Do they have a line in their EULA (which itself's legality is bit questionable, afaik) that you also agree to anything they come up in the future?