9781423901402_PPT_Ch17 - Information Technology in Theory...

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Chapter 17 Voice over IP Information Technology in Theory By Pelin Aksoy and Laura DeNardis
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2 Objectives Understand the concept of VoIP and how it enables the transmission of voice over the Internet Gain familiarity with VoIP protocols such as SIP, H.323, and RTP Understand options for implementing voice over the Internet Information Technology in Theory
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3 Objectives (continued) Recognize the business drivers and advantages of using VoIP rather than traditional telephone system architectures Understand the security and performance challenges of VoIP and consider various solutions Identify the policy questions arising from the proliferation of VoIP services Information Technology in Theory
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4 VoIP VoIP = Voice over Internet Protocol Also called Internet telephony or IP telephony Refers to voice communications transmitted over the Internet or other IP network, as opposed to the public switched telephone network Information Technology in Theory
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5 Voice over the Internet Many businesses, institutions, and individual users place telephone calls over the Internet Rather than through a traditional telephone network, completely bypassing the circuit- switching approach of the telephone system A VoIP call does not necessarily remain solely on the Internet or other TCP/IP network Uses packet switching, not circuit switching Information Technology in Theory
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6 VoIP Protocols A set of standards designed for transmitting voice calls over the Internet or other IP network VoIP calls have several functional components: The signaling information that establishes the telephone call The process that digitizes the audio signal and places the information into packets The process of actually transmitting the packetized speech Information Technology in Theory
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7 VoIP Protocols (continued) Voice communication over the Internet Information Technology in Theory
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8 Signaling Protocols Signaling protocols assess user availability, ring the destination device, establish a call, and terminate a call session Two of the most well-known VoIP signaling protocols: The Session Initiation Protocol (SIP), developed by the IETF H.323 , a family of standards developed by the ITU Information Technology in Theory
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9 Session Initiation Protocol SIP is a signaling protocol that creates, manages, and terminates multimedia sessions between end- user devices, such as two telephones A session is a voice conversation or other exchange of information between users SIP operates at the Application layer of the OSI model using an information exchange that is similar to HTTP Information Technology in Theory
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10 Session Initiation Protocol (continued) Establishment of a VoIP session using SIP Information Technology in Theory
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11 SIP Functions End-user location —Find the end-user location with which to communicate End-user availability —Determine whether the end user is available and willing to engage in conversation
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This note was uploaded on 06/14/2011 for the course CIS 3003 taught by Professor Bauer during the Spring '11 term at University of Central Florida.

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9781423901402_PPT_Ch17 - Information Technology in Theory...

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