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I am curious how people can conduct penetration tests of a complex VoIP system when they barely understand how VoIP infrastructure works. Today, security people are still stuck to auditing practices from 1990s. When asked to do a penetration test, a consultant often is only looking at past issues that can be detected using various vulnerability scanners. Very few of them know that vulnerability scanners have extremely bad coverage of vulnerabilities in VoIP solutions. And even if the tools did know VoIP, who really cares about past issues that might have been relevant several years ago.