There has been growing concern about VoIP security and with recent flaws in Cisco IOS and other systems, many experts are worried.

Information Week: In its recent report, Security Considerations for Voice Over IP Systems, the National Institute of Standards and Technology says VoIP shows promise for lower cost and greater flexibility, but its very different architecture than circuit-switched telephony creates significant security issues. ‘Administrators may mistakenly assume that since digitized voice travels in packets, they can simply plug VoIP components into their already-secured networks and remain secure,’ the report says. ‘However, the process is not that simple.’