ying Cisco Voice over IP Solutions

This book is a sequel to Voice over IP Fundamentals, published by Cisco Press in2000. Since the publication of that book, there has been a fundamental change inthe assumptions made by those in the telecommunications industry. Instead ofincumbent telecommunications service providers attempting to determine whetherpacket voice will be a viable technology, they are attempting to determine the rightopportunity to begin deploying this technology. These providers are either activelyresearching the technology, conducting lab trials, or deploying it. In addition,existing TDM equipment providers have determined that they must provide packetvoice equipment in addition to their TDM equipment. These equipment providers areforced down this path due to the fact that their customers want and need topurchase this type of equipment.The next phase of packet voice will focus not just on lowering equipment costs(capital expenditures), but lowering operating expenditures. This phase will becompleted over time by integrating voice technology into Network ManagementSystems (NMS) owned by incumbent carriers as well as integrating IP data NMStechnology and packet voice network management systems.Although service providers realize that there are many benefits to packet voicetechnology, they also recognize that there are potential downsides to thistechnology. The largest of the potential caveats is multi-vendor equipmentinteroperability. Although there are many standards defining how devices shouldcommunicate with each other, there are few standards defining how theseindependent standards should communicate with each other. One example is howmany existing networks utilize H.323 to signal voice calls over IP. There are severalnewer protocols, however, that appear to have momentum in this space—MGCP,MEGACO, and SIP, for example.
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