  This dissertation has extensively looked into all aspects of VoIP
commu-nications technology, and information presented in preceding chapters,
which build up a solid framework to discuss the conceptual design model, and
investigate features that could be incorporated for actual Pro-jects, with
parameters that are tested on field values. The dissertation follows a
five-course model, for answering different questions, both tech-nical and
businesslike, around central issues, that have been crucial to explanation of
the topic; starting with a general overview of VoIP tech-nology, analyzing
current VoIP encryption methods, identifying security threats, designing a
robust VoIP system based on particulars discussed in preceding chapters, and
finally, a VoIP simulation.
