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Network talk: Voice over IP

Posted: 05 Aug 2000     Print Version  Bookmark and Share

Keywords:VoIP  VoIP system architecture  Voice over IP  telephone applications 

Network talk: Voice over IP In traditional telephony applications, speech is digitised and delivered over a circuit-switched network. During call setup, a dedicated amount of bandwidth is reserved for each phone call. In a VoIP system, voice signals are transported as packets over a packet network with no bandwidth dedicated to their delivery. The processing involved in a VoIP system is, therefore, quite different from the circuit switched delivery operation. This article looks at a typical VoIP system architecture and describes the various software modules that must be included. We will also look at estimates of code size and required processing power for each module, as well as some guidelines for partitioning the system between a traditional CPU and a DSP. View the PDF document for more information.



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