McGraw-Hill Companies | 2002 | ISBN: 0071410341 | Pages: 468 | PDF | 4 MB
There has been considerable interest in technologies, systems, and architectures
supporting voice over packet (VoP) applications during the past
five years. In particular, voice over IP (VoIP) has received tremendous
attention. Although progress on the carrier side has been relatively slow,
particularly in North America, VoIP applications in enterprise networks
have seen a fair degree of success. On the other hand, new-generation carriers
deploying systems in Asia and Europe (including cellular networks)
have found the technology to be cost-effective in greenfield environments.
Setting aside temporarily the discussion on whether VoP/VoIP is a
problem in search of a solution or a solution in search of a problem, two
factors have held back the deployment of VoP/VoIP at the technical level
on a broad scale: quality of service (QoS) considerations and robust signaling
in support of interworking with the embedded Public Switched
Telephone Network (PSTN), which is not going to go away any time in the
foreseeable decade or two.
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