This taxonomy (2005) defines the many potential security threats to voice over IP (VoIP) deployments, services, and end users. The overall goal is to help drive VoIP security awareness with the press, industry, and public. In particular this taxonomy provides a detailed structure for technical vulnerabilities that informs the following constituencies: press and public; all vendors across the value chain including carriers, service providers, equipment vendors software developers, and system integrators; the technical community of designers and experts; media and entertainment content developers and publishers; the policy and regulatory community; and the law enforcement community. This Taxonomy also provides a clear definition of security to make security measurable, actionable and subject to economic and social trade-off analysis.