• RRP: £33.50
  • You Save: £25.26 (75%)
FREE Delivery in the UK on orders with at least £10 of books.
Only 1 left in stock (more on the way).
Dispatched from and sold by Amazon.
Gift-wrap available.
Practical VoIP Using VOCA... has been added to your Basket
+ £2.80 UK delivery
Used: Very Good | Details
Condition: Used: Very Good
Comment: Expedited shipping available on this book. The book has been read, but is in excellent condition. Pages are intact and not marred by notes or highlighting. The spine remains undamaged.
Have one to sell?
Flip to back Flip to front
Listen Playing... Paused   You're listening to a sample of the Audible audio edition.
Learn more
See this image

Practical VoIP Using VOCAL Paperback – 18 Jul 2002

See all formats and editions Hide other formats and editions
Amazon Price New from Used from
"Please retry"
£8.24 £0.76
£8.24 FREE Delivery in the UK on orders with at least £10 of books. Only 1 left in stock (more on the way). Dispatched from and sold by Amazon. Gift-wrap available.

Product details

More About the Authors

Discover books, learn about writers, and more.

Product Description

From the Publisher

While many books describe the theory behind Voice over IP, only this one describes how such a phone system was actually built, and how you too can acquire the source code, install it onto a system, connect phones, and make calls. Because VOCAL is open source, you can look "under the hood" to discover how the system works, and how common problems are being worked out in the development environment

About the Author

Cullen Jennings is the Manager of Software Development in the Voice Architecture Group at Cisco Systems. Previously, he was vice president of engineering for Vovida Networks. His background includes management, consulting, and development both for technology-based companies and for educational institutions. Cullen is a member of the IEEE and ACM and has published numerous technical articles.

Luan Dang is Director of Software Development at Cisco Systems. Previously, Luan was Senior Vice President, Chief Technology Officer and Co-Founder of Vovida Networks. Luan is currently a member of the Technical Advisory Council for the International Softswitch Consortium and has previously filed telephony patents for voice-over-IP (1999) and caller IP (1998). Luan has also been granted a patent for the display screen management apparatus in 2000.

Customer Reviews

There are no customer reviews yet on Amazon.co.uk.
5 star
4 star
3 star
2 star
1 star

Most Helpful Customer Reviews on Amazon.com (beta)

Amazon.com: 2 reviews
8 of 8 people found the following review helpful
a credible open source implementation 1 Mar. 2005
By W Boudville - Published on Amazon.com
Format: Paperback
VoIP usage is surging amongst many users worldwide. A pack of startups has been established; each trying to dominate this field. And ATT and other large phone companies are also starting to jump in. With all this, the average VoIP user expects it to be virtually indistinguishable from an traditional phone experience.

Well, that is where this book and you come into the scene. To make that simple user experience requires a huge amount of technical work. The book gives you a detailed appreciation of what that involves. This VOCAL is "only" one VoIP implementation. But it may be attractive, because it is open source. The book's authors were instrumental in designing VOCAL and offer the book as the definitive text on it. They give a lot of functionality, with the added promise that it is very scalable.

I cannot discern from the book how VOCAL will fare against well funded proprietary VoIP solutions. But at least VOCAL seems to give them serious opposition, as a credible and free alternative.
1 of 6 people found the following review helpful
Source those cheap Net phone-calls 2 Jun. 2006
By FN - Published on Amazon.com
Format: Paperback
Source those cheap Net phone-calls

Reviewed by: Frederick Noronha

Practical VoIP Using

VOCAL Luan Dang,

Cullen Jennings

& David Kelly

Publisher: O' Reilly, 2002

Price: $44.95

From the cover, an angry-looking snipefish stares out at you. Across its five-hundred odd pages, a sea of technical data greets you. Practical VoIP Using VOCAL is a book for those wanting to build their own VoIP system. Voice over Internet Protocol software improvements (with better bandwidth and processing speed) have made Internet telephony a decent-enough option to consider.

This book describes how the system is actually built. You can acquire the source code, install it onto a system, connect phones and make calls.

Co-author Dang is co-founder of Vovida Networks. VOCAL (the Vovida Open Communication Library) is an open-source software project. It provides call control, routing, media, policy, billing information and provisioning.

Your system can scale from a single box to multihost carrier grade. VOCAL is freely available from the Cisco-sponsored Vovida.org site. VOCAL is open-source. You can see not just how the system works, but also how common problems are being worked out in the development environment.

This book promises to "show how to implement, program and administer VoIP systems using open-source tools." As co-author Jennings argues: "Along with other VoIP applications, VOCAL is actively inverting the way telephony is deployed by allowing an Internet-style anarchy that was never possible in the traditional PSTN (Public Switched Telephone Network). It has been a fun area to work in."

True. For us in India, since Fool's Day 2002, the area of Internet telephony has become a reality. Who doesn't want inexpensive telephone calls over the Internet, limiting long-distance charges to the nominal cost of


But the price of this US-published book (almost US$45), for us here, is still an issue. Hopefully the Indian edition at more affordable rates won't be too long in coming. All in all, a good book for those interested in this field. And, this is a field more should definitely get interested, if we're to enable the world's second-largest populated country to have more affordable access to communicating globally.
Were these reviews helpful? Let us know