Network-Level Redundancy in Visual Studio .NET

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Network-Level Redundancy
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If we are to design a carrier-grade network, then all the products in the network must include significant levels of redundancy From a network design perspective, however, we must decide whether to include redundancy at the network level We saw in 6, Media Gateway Control and the Softswitch Architecture, that an MG can be handed off to a secondary MGC if a primary MGC fails If the secondary MGC normally carries traffic of its own, we should make sure that the secondary MGC has the capacity to handle some (or all) of the load of the new MG in addition to existing traffic In other words, we must design the network so that excess capacity is available in the secondary MGC We must also decide how much excess capacity we will include For example, we might decide that the secondary MGC should have the capacity to handle its normal expected load (including build-ahead), plus only 50 percent of the load that would be carried by the failed MGC Implementing network-level redundancy can be done in several ways If, for example, we have 3 MGCs (MGC-A, MGC-B, and MGC-C), then each could back up another Thus, MGC-B could be a backup for some or all of MGC-A s traffic, MGC-C could be a backup for some or all of MGC-B s
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Designing a Voice over IP Network
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traffic, and MGC-A could be a backup for some or all of MGC-C s traffic Alternatively, we might choose to have a single redundant MGC for the whole network That MGC would begin handling traffic in the event of failure of any MGC on the network Again, the choice of redundancy technique depends on the capabilities of the vendor For example, although a single MGC acting as a backup for all others might be the most cost-effective solution, it might require that the backup MGC be loaded with all the port/termination configuration data related to all the MGs on the network The on-board availability of such data might be required in order for the backup MGC to quickly assume control in the event of a failure The number of supported ports might be a capacity-limiting factor on the MGC, however, which might mean that a single backup MGC for the whole network would not be possible You might think that we should not have such a problem After all, MEGACO enables an MGC to query an MG as to the capabilities and current status of its terminations Thus, the back-up MGC could automatically load data for the MG(s) that it must support without having data in advance for all terminations on all MGs MEGACO does support such capabilities, but whether a given MGC supports that aspect of MEGACO is another matter and could be vendor dependent In our example, we will assume that we can implement a single backup MGC to support the failure of any active MGC
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Voice Coder/Decoder (Codec) Selection Issues
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We must make a number of decisions regarding voice coding First, we must choose the actual coder/decoder (codec) to use Second, we must select the packetization interval Third, we must decide whether or not to use silence suppression These decisions can have a profound impact on the quality of service (QoS) offered to our subscribers As with many of our decisions, however, a trade-off takes place between the quality we offer, the cost of the network, and the capabilities of our vendors Clearly, G711 is the simplest (and highest-quality) codec we can deploy and should be the first choice if we want to ensure superior voice quality G711 uses higher bandwidth than other codecs, however Of course, we can choose any number of coding schemes (G7231, G729, G726, and so on), many of which provide good quality and that enable lower-bandwidth consumption than G711 The network architecture should at least perform a
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