One of the ways that most VoIP providers secure their customers' personal information via tunneling and encryption process. These techniques keep hackers and those will ill intent from capturing information packets as they pass through the Internet. Most VoIP providers use Layer 2 Tunneling and an encryption method called Secure Sockets Layer, or SSL to keep anyone from entering any information they should not have. Security of VoIP will undoubtedly change and become more sophisticated as technology allows and consumers demand more security and more privacy. For some time to come VoIP security will remain a major problem, just because it's common knowledge that all information passing over the internet could potentially fall into the hands of someone with evil intentions.
Do not let VoIP security issues keep you from getting VoIP services. The benefits of VoIP far outweigh the security risks. The bottom line is that you are more at risk every time you get online sending emails and paying bills than you will every time you use your VoIP services. So the features and convenience is worth the small security risk associated with Internet access associated with it!