On Network Functions Virtualization and Hybrid Circuit-Packet Switching

A main goal of the paper is to discuss the world telecommunications strategy in transition to the IP world. Particularly, we analyze the network functions virtualization and network slicing from the viewpoint of shifting from circuit switching to packet switching in telecommunications. As a case, we are passing through three generations of American military communications: (1) The implementation of signaling protocol SS7 and Advanced Intelligent Network, (2) Transformation from SS7 to IP protocol and, finally, (3) The extremely ambitious cyber security issues. In Conclusion, we consider one hybrid circuit- packet proposal for Defense Red Switched Network and ask the crucial question, relating the Defense Information System Network transition to IP world: is it possible at all