| 2.1 Introducing VoIP Networks |
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| 2.1.1 Benefits of VoIP Networks |
| 2.1.2 Components of a VoIP Network |
| 2.1.3 Legacy Analog Interfaces in VoIP Networks |
| 2.1.4 Digital Interfaces |
| 2.1.5 Stages for Completing a VoIP Telephone Call |
| 2.1.6 Distributed Call Control |
| 2.1.7 Centralized Call Control |
| 2.2 Digitizing and Packetizing Voice |
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| 2.2.1 Basic Voice Encoding: Converting Analog Signals to Digital Signals |
| 2.2.2 Basic Voice Encoding: Converting Digital Signals to Analog Signals |
| 2.2.3 Sampling |
| 2.2.4 Quantization |
| 2.2.5 Digital Voice Encoding |
| 2.2.6 Companding |
| 2.2.7 Common Voice Codec Characteristics |
| 2.2.8 Selecting a Codec Using the Mean Opinion Score |
| 2.2.9 A Closer Look at a DSP |
| 2.3 Encapsulating Voice Packets for Transport |
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| 2.3.1 Voice Transport in Circuit-Switched Networks |
| 2.3.2 Voice Transport in IP Networks |
| 2.3.3 Protocols Used in Voice Encapsulation |
| 2.3.4 Voice Encapsulation Codecs |
| 2.3.5 Reducing Header Overhead with cRTP |
| 2.3.6 When to Use RTP Header Compression |
| 2.4 Calculating Bandwidth Requirements for VoIP |
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| 2.4.1 Impact of Voice Samples and Packet Size on Bandwidth |
| 2.4.2 Impact of Codecs on Bandwidth |
| 2.4.3 How the Packetization Period Affects VoIP Packet Size and Rate |
| 2.4.4 Data-Link Overhead |
| 2.4.5 Security and Tunneling Overhead |
| 2.4.6 Extra Headers in Security and Tunneling Protocols |
| 2.4.7 Calculating the Total Bandwidth for a VoIP Call |
| 2.4.8 Quick Bandwidth Calculation |
| 2.4.9 Effects of VAD on Bandwidth |
| 2.5 Implementing VoIP in an Enterprise Network |
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| 2.5.1 Enterprise Voice Implementations |
| 2.5.2 Deploying CAC |
| 2.5.3 Voice Gateway Functions on a Cisco Router |
| 2.5.4 Cisco Unified CallManager Functions |
| 2.5.5 Enterprise IP Telephony Deployment Models |
| 2.5.6 Cisco IOS Configurations for VoIP |
| 2.6 VoIP Lab Exercises |
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| 2.6.1 Lab 2.1 Configure CME using the CLI and Cisco IP Communicator |