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technologies is manifested in innovative compositions of connectivity pathways. Indeed, veritable
scaolding for embedding the vital ingredients of mobility, interoperability, open interfaces, han-
dover, QoS, seamless service, extensibility, scalability, and security across a web of connectivity
pathways. e ubiquitous IP scaolding enables both vertical handover (across connectivity tech-
nologies) and horizontal handover (across dierent domains of the same connectivity technology).
e two main categories of functions within the NGN architectural model, depicted in Figure
3.19, are identied as “NGN Transport” and “NGN Ser ...