Amir Ranjbar CCIE No. 8669, is an instructor and senior network architect for Global Knowledge, Cisco's largest training partner. He is a Certified Cisco Systems Instructor and has a Bachelor's degree in Computing and Information Science and a Master's Degree in Knowledge Based Systems from the University of Guelph in Ontario, Canada. Amir is the author of the first edition of the CCNP Support Exam Certification Guide.
Part I Voice over IP 3
Chapter 1 Cisco VoIP Implementations 5
Do I Know This Already? Quiz 5
Foundation Topics 10
Introduction to VoIP Networks 10
Benefits of Packet Telephony Networks 10
Packet Telephony Components 11
Analog Interfaces 13
Digital Interfaces 14
Stages of a Phone Call 15
Distributed Versus Centralized Call Control 16
Digitizing and Packetizing Voice 19
Basic Voice Encoding: Converting Analog to Digital 19
Basic Voice Encoding: Converting Digital to Analog 20
The Nyquist Theorem 21
Quantization 22
Compression Bandwidth Requirements and Their Comparative Qualities 24
Digital Signal Processors 25
Encapsulating Voice Packets 27
End-to-End Delivery of Voice 27
Protocols Used in Voice Encapsulation 30
Reducing Header Overhead 32
Bandwidth Calculation 34
Impact of Voice Samples and Packet Size on Bandwidth 34
Data Link Overhead 37
Security and Tunneling Overhead 37
Calculating the Total Bandwidth for a VoIP Call 39
Effects of VAD on Bandwidth 41
Implementing VoIP Support in an Enterprise Network 42
Enterprise Voice Implementations 42
Voice Gateway Functions on a Cisco Router 44
Cisco Unified CallManager Functions 45
Enterprise IP Telephony Deployment Models 46
Single-Site Model 46
Multisite with Centralized Call Processing Model 46
Multisite with Distributed Call Processing Model 47
Clustering over WAN Model 48
Identifying Voice Commands in IOS Configurations 48
Call Admission Control (CAC) 49
Part II Quality of Service 55
Chapter 2 IP Quality of Service 57
Do I Know This Already? Quiz 57
Foundation Topics 62
Introduction to QoS 62
Converged Network Issues Related to QoS 62
Available Bandwidth 63
End-to-End Delay 64
Delay Variation 65
Packet Loss 66
Definition of QoS and the Three Steps to Implementing It 68
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