If you're wondering how easy it is to hack a voice over ip phone service, the answer, unfortunately, is pretty darn easy. In an article posted on the Enquirer website, UK VoIP expert Peter Cox discusses his results using proof-of-concept software that can hack into voice over IP phone calls, allowing outside parties to eavesdrop on the calls made over such a network. According to the article written by Nick Farrell, SIPtap, "Called SIPtap, the software snuffles around several VoIP call streams, earwigs in on them and records them as .wav files for later distribution. All it takes is one trojan installed in the company's network and it is good night Vienna for your VoIP network. Cox claims that the hack would work at ISP level too. Cox said that he was inspired to write the software after chatting to encryption guru Phil Zimmermann, creator of Zfone. Zimmerman was the bloke who designed a system to protect against SIPtap-like hacking by using VoIP call encryption." So, if you're currently using a VoIP phone service, you'd better add extra security, because hackers or your competition could be intercepting your phone calls.