VoIP?Making Sense of the Protocols. ? ?The Great Voice Myth? … Defining the
VoIP Protocols. ? H.323. An ITU Recommendation that defines ?Packet-based

1 © 2002, Cisco Systems, Inc. All rights reserved. 4426_02_2002_c1 Undetanding Voice over IP Protocols Cisco Systems—Service Provider Solutio Engineering February, 2002 2 © 2002, Cisco Systems, Inc. All rights reserved. 4426_02_2002_c1 Topics to Discuss • History of VoIP • VoIP—Early Adopte • VoIP—Standards and Standards Bodies • VoIP—Making See of the Protocols • “The Great Voice Myth” • VoIP—Protocol Challenges • Summary 3 © 2002, Cisco Systems, Inc. All rights reserved. 4426_02_2002_c1 Why Move to VoIP? • Cost savings—toll bypass • Open standards—H.323, SIP, MGCP • Multi-vendor interoperability • Integrated IP voice and data networks 4 © 2002, Cisco Systems, Inc. All rights reserved. 4426_02_2002_c1 Cisco Packet Voice Architecture TDM/ Circuit Switch TDM/ Circuit Switch Digital Trunk Subsystem Line Concentration Administration Maintenance Billing Call Control Connection Control Features Common Channel Signaling Complex Switching Network Standards-Based Packet Infrastructure Layer (IP, ATM) Open Call Control Layer (SIP, H.323, MGCP, etc.) Open Service Application Layer (JAIN, AIN, TAPI, JTAPI, XML etc.) Open/Standard Interface Open/Standard Interface Page 5 5 © 2002, Cisco Systems, Inc. All rights reserved. 4426_02_2002_c1 Topics to Discuss • History of VoIP • VoIP—Early Adopte • VoIP—Standards and Standards Bodies • VoIP—Making See of the Protocols • “The Great Voice Myth” • VoIP—Protocol Challenges • Summary Page 6 6 © 2002, Cisco Systems,

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