Source: Carrier Grade Voice Over IP in .NET framework

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Source: Carrier Grade Voice Over IP
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Designing a Voice over IP Network
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Designing a Voice over IP Network
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In general, the design of any network involves striking a balance between three requirements: meeting or exceeding the capacity needed to handle the projected demand, minimizing the capital and operational cost of the network, and ensuring high network reliability and availability In short, we can refer to these three issues as cost, capacity, and quality Meeting one or more of the requirements often means making sacrifices elsewhere, such that it is impossible to divorce one network design consideration from any of the others For example, a lower cost might well mean a lower network capacity or a lower network quality Thus, we will never get a network that is remarkably cheap to implement and operate while still offering high capacity and high quality Instead, we must aim to establish some happy medium where we satisfy at least the most important criteria to an acceptable degree Of course, the question is, What is an acceptable degree If we want to design a carrier-grade network, one design criteria to include is an overall availability of at least 99999 percent (five-nines), which corresponds to a down time of no more than about 5 minutes per year Other design criteria will be based upon projected usage of the network and business considerations For example, network capacity will be driven by expected traffic demand Network cost will usually be the result of a negotiation between the carrier s engineering organization and the financial/commercial department At the end of the day, the cost of the network must be sufficiently low to ensure that it costs less to build and operate than the revenue it will generate In general, designing a network has no one-size-fits-all solution A number of general rules and an overall approach, however, can be applied in most network design efforts The overall approach includes the following aspects:
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Understanding the expected traffic demand, such as where traffic will come from and go to, and what typical per-subscriber usage is expected Establishing network design criteria, such as build-ahead, voice-coding schemes, network technology (such as softswitch versus H323), whether to use silence suppression, whether to include network-level redundancy, and so on Vendor and product selection, including the development of a Request for Information (RFI) or Request for Proposal (RFP) and the comparison of vendor responses Network topology, connectivity, and bandwidth requirements Physical connectivity
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Often the network design process is iterative For example, one might apply certain design criteria to develop a draft design that meets capacity
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Designing a Voice over IP Network
Designing a Voice over IP Network
requirements only to find that such a design would be too expensive In such a case, one might need to revise the design assumptions in order to design a more cost-effective network In order to illustrate the various steps in the process, we focus much of this chapter on a fictitious Voice over IP (VoIP) network We will design this network from scratch, with an explanation of each step along the way For some of the steps, we will perform all the detailed calculations The fictitious network will be required to provide long-distance service in North America Our network will provide service to subscribers in 12 cities, City 1 through City 12, as shown in Figure 9-1
Design Criteria
In order to develop a network design, we must establish certain design criteria Among other things, we need to specify whether we will have a buildahead or some capacity buffer For example, it is pointless to design a network that will only support the immediate demand Taking such an
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