About the Authors
by Steve Fry, Thiya Ramalingam, Scott Firestone
Voice and Video Conferencing Fundamentals
- Copyright
- About the Authors
- About the Technical Reviewers
- Acknowledgments
- Icons Used in This Book
- Command Syntax Conventions
- Foreword
- Introduction
- 1. Overview of Conferencing Services
- 2. Conferencing System Design and Architecture
- 3. Fundamentals of Video Compression
- Evaluating Video Quality, Bit Rate, and Signal-to-Noise Ratio
- Video Source Formats
- Basics of Video Coding
- Hybrid Coding
- Scalable Layered Codecs
- Switching Frames
- Video Codecs
- Summary
- References
- 4. Media Control and Transport
- 5. Signaling Protocols: Conferencing Using SIP
- 6. Signaling Protocols: Conferencing Using H.323
- H.323 Overview
- H.323 Endpoint Aliasing
- H.225 Call Signaling
- H.245 Control Protocol
- H.245 Messages
- Terminal Capability Set
- Simultaneous Capability Set
- H.245 User Input Indications
- Indicating DTMF Relay Support in the TCS Message
- Master-Slave Determination
- Open Logical Channel Requests
- Open Logical Channel Acknowledgment
- Close Logical Channel
- Close Logical Channel Acknowledgment
- Request Channel Close
- H.245 EndSession Command
- Video-Specific H.245 Messages
- H.323 Fast Connect Mode
- H.245 Messages
- Using the Empty Capability Set
- H.323 Device Types
- H.323 Gatekeeper Services
- Required H.323 Gatekeeper Features
- Optional H.323 Gatekeeper Features
- Gatekeeper Signaling Options
- Gatekeeper RAS Signaling
- Mid-Call Bandwidth Requests
- Configuring a Gatekeeper in Cisco Unified CallManager
- Configuring Gatekeeper Support in a Cisco IOS Router
- H.225 Call Setup for Video Devices Using a Gatekeeper
- Using Service Prefixes with MCUs
- Summary
- References
- 7. Lip Synchronization in Video Conferencing
- 8. Security Design in Conferencing
- Security Fundamentals
- Threats
- Configuring Basic Security
- Port Usage
- NAT and PAT
- Encryption Basics
- IPsec and TLS for Secure Signaling
- Media Encryption
- H.323 Encryption: H.235
- SIP Encryption
- Summary
- References
- A. Video Codec Standards
Scott Firestone holds a master’s degree in computer science from MIT and has designed video conferencing and voice products since 1992, resulting in five patents. During his 10 years as a technical leader at Cisco, Scott developed architectures and solutions related to video conferencing, voice and video streaming, and voice-over-IP security.
Thiya Ramalingam is an engineering manager for the Unified Communications organization at Cisco. Thiya holds a master’s degree in computer engineering and an MBA from San Jose State University. He holds several patents issued and pending, related to voice and video over IP. Thiya is currently leading the development of multimedia conferencing products at Cisco.
Steve Fry is a technical leader in the Unified Communications organization at Cisco. For the past several years, Steve has been involved in the design and development of telephony and conferencing products. Prior to his conferencing projects, he was a principal engineer on the CallManager MGCP gateway products. He is currently leading product development in video conferencing.
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