VoIP Handbook: Applications, Technologies, Reliability, and Security capturing thestate Artin VoIP technology and serves as a comprehensive reference on this technology everywhere soon-to-be. Itprovides: A methodology of step-by-step to evaluate the performance of VoIP networks before implementing an invaluable overview of the challenges of implementation and some system multipoint VoIP conferencing design and unparalleled coverage of issues such as VoIP traffic engineering, QoS requirements, and the flow of VoIP As the technology is promising s increasing popularity,? New demands to improve quality, reduce cost and increase willcontinue smooth operation.