After some simple researching I have found the reason why Ventrilo may not be working for you if you live in a 'uncommon' country. First of here are the list of countries Ventrilo actually does support.
United States of America
So if you don't live in those countries you will have a hard time getting on Ventrilo. Fortunately there is as solution to this problem. This requires connecting to Ventrilo with a proxy.
Just watch this video and it will explain everything ;)
NOTE: Don't use the proxy the person gave to you at 0:28. You can find fresh new proxies at:http://sockslist.net/
If your wondering whether to click Sock5 or Sock4 look at the site I gave you earlier and look to the right of the Proxy you chose and look under type and it will say either 4, 5 or 4/5.
Some proxies work at a different speed so don't just use one try a couple out :P. Make sure you click check before using it. This also a good tool to hide your IP Address from DDOSers.
Hopefully this works for you. Any questions, comments, and concerns post below.