Released on: February 4, 2008, 7:27 am

Press Release Author: ADTRAN

Industry: Telecommunications

Press Release Summary: ADTRAN, Inc. (NASDAQ: ADTN), a leading supplier of
next-generation network solutions, has been chronicled in a new best-selling
business book, "The Breakthrough Company".

Press Release Body: "The Breakthrough Company" Features ADTRAN as One of Nine
Companies with Formula for Success

New Best Seller Cites ADTRAN for Top Performance

HUNTSVILLE, Ala.-(February 4, 2008)-ADTRAN, Inc. (NASDAQ: ADTN), a leading supplier
of next-generation network solutions, has been chronicled in a new best-selling
business book, "The Breakthrough Company". The book examines how everyday companies
become extraordinary performers. Touted as the most extensive, empirical look at
growth companies ever, the book features ADTRAN as one of only nine "breakthrough"
companies.

The book, authored by former tech CEO and business school dean, Keith McFarland,
reveals the results of more than five years of research where more than 7,000 growth
companies seeking to become powerhouses in their industries were studied. McFarland
built and analyzed the world's largest growth-company performance database. He
interviewed more than 1,500 executives on four continents and conducted intensive
90-day studies with 52 firms ranging in size from $9 million to $3 billion in annual
sales. Eventually, nine breakthrough companies were revealed: ADTRAN, Chico's,
Express Personnel, Fastnel, Intuit, Paychex, SAS Institute, and The Staubach
Company.

"ADTRAN is a perfect example of how to navigate what we termed as the Business
Bermuda Triangle," said McFarland. "ADTRAN has been able to take the core values
that helped it gain initial success and has transformed those into sustaining
advantages that have helped propel it to nearly one-half billion dollars in annual
revenues."

"Many people have asked for ADTRAN's secret to success over the years," said Tom
Stanton, CEO of ADTRAN. "Keith's research reinforces what we have said since the
beginning - it comes down to who we are and how we do business. We have chosen to
follow a different path, truly putting our customer first."

The Wall Street Journal named The Breakthrough Company the #1 National Business Best
Seller. The book has also been named a National Best Seller by the New York Times
and USA Today. For more information on the book, visit www.breakthroughcompany.com.

About ADTRAN
ADTRAN, Inc. is a leading global provider of networking and communications
equipment, with a portfolio of more than 1,600 solutions for use in the last mile of
today\'s telecommunications networks. Widely deployed by carriers and enterprises
alike, ADTRAN solutions enable voice, data, video, and Internet communications
across copper, fiber, and wireless network infrastructures. ADTRAN solutions are
currently in use by every major U.S. service provider and many global ones, as well
as by thousands of public, private and governmental organizations worldwide.

For more information, contact the company at 800 9ADTRAN (800 923-8726) or via email
at info@adtran.com. On the Web, visit www.adtran.com.

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Web Site: http://www.adtran.com

Contact Details: Contact:
Betty Johnson
ADTRAN
214-707-1966
beejaywalker@sbcglobal.net

Tammie Dodson
ADTRAN
256-963-6739
tammie.dodson@adtran.com