VoIP security threats: Fact or fiction?

Imagine an intruder found his way into your VoIP network undetected and began listening to any conversation he chose, extracting sensitive information, company secrets or even details he could use to blackmail your CEO. Last month, a company called Internet Security Systems (ISS) issued an alert to warn users that Cisco's VoIP offering had a security flaw that would allow just that. According to the company, this implementation flaw in Cisco's Call Manager, which handles call signaling and routing, could allow a buffer overflow that would grant an intruder access to the system to listen in on all calls routed through it.

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