Chapter 2. Configuring Basic Voice over IP
After reading this chapter, you should be able to perform the following tasks:
• Describe how VoIP signaling and media transmission differs from traditional voice circuits, and explain how voice is sent over IP networks, including analog-to-digital conversion, coding, packetization, and all variants of RTP.
• Describe the characteristics of H.323 and explain when to use it.
• Describe the characteristics of SIP and explain when to use it.
• Describe the characteristics of MGCP and explain when to use it.
• Discuss special requirements for VoIP call legs, including the need for QoS, fax/modem relay, and DTMF support.
• Describe how to configure dial peers to meet special requirements.
VoIP transmission ...