C.1. Introduction p.1-- C.2. Why implement voice over IP p.4-- C.3. Voip Networks and Theory of operations p.12-- C.4. Voip network standards p.23-- C.5. Voice over IP Network architectures p.33-- C.6. Voip Network security p.46-- C.7. Transitioning to voip p.62-- C.8. Voip network operations p.79-- C.9. New services enabled by voip p.94-- C.10. Working with the vendors & technology p.96--