Very interesting article on Voice IP in Vietnam. Many people in Vietnam that make internet telephone calls outside the country, whether it be with Skype, USVoiz, or VietVoiz, have no idea that they are breaking the law. You are only allowed to use a VoIP service whose server is located in Vietnam. The company must also have the ever elusive, hard to get, telecom license.
Skype, USVoiz and VietVoiz do not have legal authority to allow calls from Vietnam to other countries. The servers for these companies are located outside of Vietnam. Hence, any calls made to/from the US tend to have poor connections, even with Skype. Now, you can make computer to computer calls, that is legal here. For me, this tends to be clear regardless of the country whether it be the US, Kazakhstan, Mongolia, Israel, or Kenya. Once I make a telephone call with the providers mentioned above, the calls are no longer clear.
Be weary of that next internet telephone call to the States, you are breaking the law (^_^).
Go to article here -> Internet telephony comes under gov’t scrutiny