Chapter 1. Understanding VoIP Basics

Modern enterprise network designs need to support the transmission of voice traffic. This voice traffic can come from analog phones (much like the phones typically found in homes) or IP phones, which are Ethernet devices that transmit voice IP packets. Because the analog phones cannot generate IP packets, they connect to analog gateways (such as Cisco routers) that convert the spoken-voice IP packets.

The term Voice over IP, or VoIP, is used to describe the transmission of voice over a network using voice-enabled routers. The term IP telephony refers to the use of IP phones and a call processing server (for example, Cisco Unified Communications Manager [UCM]). However, because many voice-enabled networks contain ...

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