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Zapata Telephony Project, 3
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About the Authors
Jim Van Meggelen is a founding partner and CTO of Clearly Core Inc., a Canada-
based provider of open source telephony solutions. He has nearly 30 years of enter‐
prise telecom experience, with extensive knowledge of both legacy telecom and VoIP.
Russell Bryant is a Distinguished Engineer at Red Hat, where he works on cloud
infrastructure projects. Prior to working for Red Hat, Russell spent seven years work‐
ing for Digium on the Asterisk project. Russell’s role at Digium began as a software
developer and concluded with being the leader of the Asterisk project and engineer‐
ing manager for the team focused on Asterisk development.
Leif Madsen is the Cloud Service Assurance Architect within the CloudOps team at
Red Hat, where he leads the engineering effort to provide Service Assurance to both
telecommunications and enterprise companies. He first got involved with the Aster‐
isk community when he was looking for a voice-conferencing solution. Once he
learned that there was no official Asterisk documentation, he cofounded the Asterisk
Documentation Project.
Colophon
The animals on the cover of Asterisk: The Definitive Guide are starfish (Asteroidea), a
group of echinoderms (spiny-skinned invertebrates found only in the sea). Most star‐
fish have fivefold radial symmetry (arms or rays branching from a central body disc
in multiples of five), though some species have four or nine arms. There are over
1,500 species of starfish.
Starfish live on the sea floor and in tidal pools, clinging to rocks and moving (slowly)
using a water-based vascular system to manipulate hundreds of tiny, tube-like legs,
called podia. A small bulb or ampulla at the top of the tube contracts, expelling water
and expanding the starfish’s leg. The ampulla relaxes, and the leg retracts. At the tip of
each leg is a suction cup that allows the starfish to pry open clam, oyster, or mussel
shells. Starfish are carnivores; they eat coral, fish, bivalves, and snails.
Starfish can flex and manipulate their arms to fit into small places. At the end of each
arm is an eyespot, a primitive sensor that detects light and helps the starfish deter‐
mine direction. Starfish also have the ability to regenerate a missing limb. Some spe‐
cies can even regrow a complete, new starfish from a severed arm.
Many of the animals on O’Reilly covers are endangered; all of them are important to
the world. The cover illustration is by Karen Montgomery, based on a black and
white engraving from the Dover Pictorial Archive. The cover fonts are Gilroy Semi‐
bold and Guardian Sans. The text font is Adobe Minion Pro; the heading font is
Adobe Myriad Condensed; and the code font is Dalton Maag’s Ubuntu Mono.
There’s much more
where this came from.
Experience books, videos, live online
training courses, and more from O’Reilly
and our 200+ partners—all in one place.
Learn more at oreilly.com/online-learning
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