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CCNP Voice CVoice 642-437 Quick Reference, Third Edition by Kevin Wallace - CCIE No. 7945, Toby Sauer

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Section 2. VoIP Call Legs

In this section, you will learn about how VoIP traffic is created. Topics such as codecs and transport layers are examined in more detail.

Examining VoIP Call Legs and VoIP Media Transmission

VoIP Overview

VoIP traffic has both similarities to and differences form traditional telephony. The most apparent difference is the transport method. Traditional telephony used circuit-switched technology where the physical wire leading to one device is electronically connected to the physical circuit of another device. The technology switches (connects) physical electrical circuits. VoIP uses packet-switching technology. The source device creates voice traffic in the form of IP packets. These packets are treated in the same manner ...

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