Hello,
Belize internet provider BTL is blocking VoIP softwares such as Skype.
The only solution that works is the "personalVPN" from Witopia. It costs 39,99$ per year and is really simple to use.

Witopia personalVPN Homepage

The personalVPN encrypte your connection to a US IP address, with this method Belize Telecom can't detect that you're using Skype or another VoIP software!
In addition, it protects your computer against hackers!
It works on Windows 2000, Windows XP, Windows Vista, Macintosh OS X, and Linux.
I hope we'll see you back soon on Skype...

Click here to access the Witopia personalVPN Homepage