If you're considering business VOIP, security should be a concern. Basically, Business VOIP should be treated like any other part of your data network. It should be protected by a network firewall and connections outside the firewall should be limited, monitored and protected with encryption technology and a VPN. If you take these precautions and continue to monitor security as an overall extension of your network, your Business VOIP should be reasonably secure. But no technology that uses the Internet will ever be completely secure and you should take that into account before making a big investment in Business VOIP.