Page 1 Copyright © 2008
VoIP Workbook
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Notice of Rights
All rights reserved. No part of this book may be reproduced or transmitted in any form by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher.
Notice of Liability
The information in this book is distributed on an “As Is” basis without warranty. While every precaution has been taken in the preparation of the book, neither the author nor the publisher shall have any liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or indirectly by the instructions contained in this book or by the products described in it.
Trademarks
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TABLE OF CONTENTS
GETTING STARTED IN VoIP...5
TELEPHONY WORKSHOP...21
DESIGN AND DEPLOYING VoIP...39
VOICE OVER IP PROTOCOLS OVERVIEW ...67
AN INTRODUCTION TO VOICE OVER INTERNET PROTOCOL (VoIP) ...101
SUPPORTING DOCUMENTS ...113
VoIP PROJECT PLAN...115
BUSINESS PLAN ...121
IMPLEMENTATION PLAN ...163
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GETTING STARTED IN VoIP
VoIP Definition
• Delivery of voice services over an IP network • Includes IP telephony, LAN telephony, Toll bypass • Subsut of convergence
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Primary Drivers of VoIP
• Reduce costs
• Increase Flexibility
• Enable new application
• Increase productivity
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Voice is Different for Each Organization
• Understand the role of voice in your business • Commodity
• Core application
• Mission-critical users
• Tolerance for ‘glitches’
• Determine goal of VoIP
• ROI targets
• Hard vs. soft saving
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IP PBX Characteristics
• Only true packet voice system for enterprises • Uses packetized voice for all “on-net” calls • Standards-based, open, extensible architecture • Dominant in market today
• Data vendors are leaders
• Voice vendors answering the call
• Technology leap
Page 11 IP-enabled PBX Characteristics
• Predominantly voice vendors
• Potential to leverage existing PBX investments • Most systems allow for installation of IP line cards
• Provides easy migration path, although not a true VoIP solution
• Existing features/functionality
• Some systems convert voice to TDM and back, which causes latency • Solutions tied to highly proprietary PBX platforms
VoIP Workbook
Page 13 Technical Challenges
Relatively new technology
• Pilot and interoperability testing a must Bandwidth management
• QoS, CAC, voice and data segmentation (VLANs) Delay
• Serialization, compression-time delay, one-way latency Jitter
• Must be predictable
Security and integrity of voice and data • Robust security policy is a must
Emergency location within a campus environment • E911 (US), 999 (UK), E1-1-2 (Europe) Remote-site telephony
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Developing the Business Case
• Design a structure
• Identify architectural elements
• Develop a demand forecast
• Project the rollout over time
• Analyze costs
• Hard and soft cost • Fixed and variable costs
• One-time and recurring charges • Site level and centralized costs
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Business Case Challenges
• Architecture fluctuations
• Fork-lift upgrade to PBX infeasible • IP phone price = traditional phones • Toll bypass vs. voice VPN
• Detailed toll patterns required for analysis • Quantifying current and/or projected costs
• Moves/adds/changes • Training
• Network surveillance and management
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The Bottom Line
VoIP offers great promise for cost saving Each situation is unique
• Determine feasibility
• Plan the architecture
• Build a business case
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TELEPHONY WORKSHOP
“Free: IP Telephony Enables Premium IP Communication Services Transport Level
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Continued…
Application Level (shortlist)
• Gateway services to PSTN • PSTN and Internet interaction • AIN-like: CS-1 and CS-2 • Caller/called user preferences • IP Centrex and PC integration • Presence and instant chat
