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There are VOIP system you install in your facility and there are those you use as a service. Those that are delivered as a service (software as a service or SaaS) represent far less risk as cloud PBX providers are better able to understand the risks and protect against them (in their software and in the management of the hardware and software.)
Here are a post we put up lately listing some of the things we do to protect VOIP customers: http://www.avoxi.com/8-security-measures-you-need-for-voip/.
No security is perfect. But, the major VOIP providers employ teams to do nothing but ensure great phone service combined with reliability and security.
VoIP Phone System are telephones utilized with Voice over Internet Protocol innovation. Voip is the innovation used to transmit sound as information or Packets over the Internet to either a Pc client or to a landline phone. Voip is expanding in ubiquity, as it is quite esteemed for its incredible quality, ease, and staggering characteristics. Voip is picking up admiration, as a reasonable solution for business needs. Voip will permit long distance calls for either free or for simply pennies contrasted with universal telephone administrations. it is very secure.
Nothing is perfectly secure. I remember as a kid that once in a while when I picked up the phone (the old school, wired with rotary dial) I would overhear a neighbor's conversation. Just a few years ago, I was sitting on my porch talking on my cell phone and a neighbor came over and told me she could hear every word we said over her baby monitor.
One point to remember from that Forbes article is that the "hacker" physically installed an external circuit board on one of the VoIP telephones at the "target's" office. It's pretty hard to make any system so secure that someone with physical access to it can't figure out a way to exploit it somehow. He could just have installed a traditional "bug" in an office phone. So, yeah, he found a hole and exploited it, but.... Cisco has already patched it by the way. I wouldn't lose a lot of sleep over this.
Given what you read in the Forbes article, maybe this link offering tips from Cisco on VoIP phone security isn't the way to go here.
How secure VoIP systems are probably is slightly subjective, though there are enough questions that this white paper was able to compile a list of top 10 security issues for VoIP. Perhaps the most important point in the white paper is that "VoIP security is only as reliable as the underlying network security."