Waterville
As a robust client/server application modeled on familiar IETF protocols, such as SMTP and HTTP, SIP would seem to have a simple, clearly defined role in a suite of IP tools. However, a number of variables add complexity to SIP's operation.
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The design of an adequately provisioned voice/data network begins with careful usage measurement. Fortunately, there are tools to help.
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Skype is a software application that can be used to make phone calls over the Internet. The service is free when calls are made to and from Skype users on their PCs and it can also be used to make phone calls to landlines and cell phone numbers for a fee.
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Media gateways physically connect dissimilar networks by translating the protocols and data transmission parameters of each to the other. They do a few other things as well.
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The Media Gateway Controller is in the logical portion of the softswitch architecture; the Media Gateway, the physical. Allowing the former to talk to the latter are two protocols; we'll examine one.
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The communications—such as on/off-hook, dialtone, and busy signal—that set up and terminate calls on the PSTN are replaced by a complex set of protocols and procedures in the packet-based H.323 world.
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This mother of all QoS solutions tracks flows, schedules packets, and generally manages network resources to ensure adequate bandwidth for the services running at any given time.
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To aid in standardizing the design of software switching equipment, the International Packet Communications Consortium has devised a schema that describes the entire complex functionality.
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New technology from Meru Networks addresses call quality issues for voice over wireless IP networks.
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Coming down the home stretch of VoIP deployment, a check-list of seemingly minor issues can make the difference between success and . . . headaches.
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