Switching to VoIP View Larger Image | Theodore Wallingford
O'Reilly Media, Paperback, Published June 2005, 475 pages, ISBN 0596008686 | List Price: $39.95
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Chapter 14: Traditional Apps on the Converged Network
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More and more businesses today are having their phone service delivered to them
through their Internet connection instead of the local phone company. This method
of receiving service over the Internet is known as VoIP (an acronym for "Voice
Over IP"). VoIP has become a viable solution and has piqued the interest
of companies small and large. The primary reason for migrating to VoIP is cost,
as it limits long-distance charges to the nominal cost of email--instead of the
normal toll charges levied by traditional phone companies.
Developed from real-world experience by a senior developer, O'Reilly's Switching
to VoIP provides solutions for the most common VoIP migration challenges. So
if you're a network professional who is migrating from a traditional telephony
system to a modern, feature-rich network, this book is a must-have. You'll discover
the difference between circuit-switched and packet-switched networks, how packet-switched
voice systems impact network infrastructure, as well as solutions for common
challenges involved with IP voice migrations. Among the challenges discussed:
* user-technology cohesiveness
* quality of service
* scalability
* topological considerations
* applications
* retro-interfacing to traditional telephony
To help you better grasp the core principles at work, Switching to VoIP uses
a combination of strategy and "how-to" using Cisco internetworking
devices, various makes of IP telephone equipment, and the Asterisk open source
PBX software by Digium.
If VoIP has got your attention, like so many others, then Switching to VoIP
will help you build your own system, install it, and begin making calls. It's
the only thing left between you and a more affordable corporate phone bill.
Table of Contents
Foreword
Preface
1. Voice and Data: Two Separate Worlds?
The PSTN
Key Systems and PBXs
Limits of Traditional Telephony
VoIP in the Home
VoIP in Business
VoIP's Changing Reputation
Key Issues: Voice and Data: Two Separate Worlds
2. Voice over Data: Many Conversations, One Network
VoIP or IP Telephony
Distributed Versus Mainframe
Key Issues: Voice over Data: Many Conversations, One Network
3. Linux as a PBX
Free Telephony Software
Installing Legacy Interface Cards
Compiling and Installing Asterisk
Monitoring Asterisk
Key Issues: Linux as a PBX
4. Circuit-Switched Telephony
Regulation and Organization of the PSTN
Components of the PSTN
Customer Premises Equipment
Time Division Multiplexing
Point-to-Point Trunking
Legacy Endpoints
Dial-Plan and PBX Design
Key Issues: Circuit-Switched Telephony
5. Enterprise Telephony Applications
Application Terminology
Basic Call Handling
Administrative Applications
Messaging Applications
Advanced Call-Handling Applications
CTI Applications
Key Issues: Telephony Applications
6. Replacing the Voice Circuit with VoIP
The "Dumb" Transport
Voice Channels
Key Issues: Replacing the Voice Circuit with VoIP
7. Replacing Call Signaling with VoIP
VoIP Signaling Protocols
H.323
SIP
IAX
MGCP
Cisco SCCP
Heterogeneous Signaling
Key Issues: Replacing Call Signaling with VoIP
8. VoIP Readiness
Assessing VoIP Readiness
Business Environment
Network Environment
Implementation Plan
Key Issues: VoIP Readiness
9. Quality of Service
QoS Past and Present
Latency, Packet Loss, and Jitter
CoS
802.1q VLAN
Quality of Service
Residential QoS
Voice QoS on Windows
Best Practices for Quality of Service
Key Issues: Quality of Service
10. Security and Monitoring
Security in Traditional Telephony
Security for IP Telephony
Access Control
Software Maintenance and Hardening
Intrusion Prevention and Monitoring
Key Issues: Security and Monitoring
11. Troubleshooting Tools
VoIP Troubleshooting Tools
The Three Things You'll Troubleshoot
SIP Packet Inspection
Interoperability
When, Not if, You Have Problems-
Simulating Media Loads
Key Issues: Troubleshooting Tools
12. PSTN Trunks
Dial-Tone Trunks
Routing PSTN Calls at Connect Points
Timing Trunk Transitions
Key Issues: PSTN Trunks
13. Network Infrastructure for VoIP
Legacy Trunks
VoIP Trunks
WAN Design
Disaster Survivability
Metro-Area Links
Firewall Issues
Peer-by-Peer Codec Selection
Key Issues: Network Infrastructure for VoIP
14. Traditional Apps on the Converged Network
Fax and Modems
Fire and Burglary Systems
Surveillance Systems and Videoconferencing
Voice Mail and IVR
Emergency Dispatch/911
Key Issues: Traditional Apps on the Converged Network
15. What Can Go Wrong?
Common Problem Situations
Key Issues: What Can Go Wrong?
16. VoIP Vendors and Services
Softphones and Instant Messaging Software
Skype
Other Desktop Telephony Software
Developer Tools and SoftPBX Systems
VoIP Service Providers
Telephony Hardware Vendors
17. Asterisk Reference
How Asterisk Is Supported
Asterisk's Configuration Files
Asterisk Dial-Plan
Asterisk Channels
The Asterisk CLI
Integrating Asterisk with Other Software
Key Issues: Asterisk Reference
A. SIP Methods and Responses
B. AGI Commands
C. Asterisk Manager Socket API Syntax
Glossary
Index
About the Author
Born and raised in Detroit, MI, Ted Wallingford began working with information
systems at the age of 7, when his father brought home a used Timex Sinclair
1000 computer and a notepad of hand-written BASIC programs from a garage sale.
This little machine was the start of an eclectic career in the business of bits
and bytes.
While working in the data center at ad agency J. Walter Thompson, Ted began
to write articles for computer magazines. This led him into writing marketing
materials for Gateway Computer and the former Amiga Inc., where he was also
webmaster in 1999. As I.T. Director for a large, private construction firm,
Ted transformed a single-operator midrange computer room into a mission-critical
24x7 data center hosting services for lines of business across the country.
Ted has designed and implemented Voice over IP on networks large and small.
He offers network design for VoIP systems and product management assistance
for up'n'coming VoIP carriers through his macVoIP.com consulting practice. Ted
believes that VoIP and the Internet are today?s revolution in distance communication.
Aside from technology and writing, Ted has served as a member of the board
of trustees for an international adoption agency in suburban Cleveland, where
he lives with his wife and two children.
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