ADTRAN and CopperCom Announce Alliance to Deliver Voice-Over-DSL; ADTRAN's Total Access System Accelerates Deployment of Integrated Broadband Services.

Business Editors

HUNTSVILLE, Ala.--(BUSINESS WIRE)--March 29, 2000

ADTRAN, Inc. (NASDAQ: ADTN) and CopperCom(TM) announced today an alliance that will further enhance the interoperability of a voice over DSL solution targeted for the rapidly growing Competitive Local Exchange (CLEC) market. The combination of ADTRAN's Total Access(TM) system with the CopperCom Gateway creates a powerful new solution to offer compelling voice over DSL services to small and medium-sized businesses. ADTRAN is a leading provider of network deployment and access solutions, and CopperCom is a Silicon Valley company that is Giving Voice to DSL(TM).

"ADTRAN is pleased to be working with CopperCom to provide voice solutions to the broadband market," said Danny Windham, ADTRAN's vice president and general manager, Enterprise Networks Division. "ADTRAN's carrier class Total Access system provides seamless integration with CopperCom's voice gateway. This partnership will further accelerate the delivery of cost-effective, reliable, high-speed voice and data services."

"Business customers now have a choice of cost-effective DSL solutions from numerous service providers," said Eric Rasmussen, consultant for TeleChoice, Inc. "The collaboration of ADTRAN and CopperCom, as two leaders in their respective product areas, furthers voice over DSL service offerings for this very hot industry segment."

"ADTRAN shares our vision for providing customers with strategic competitive solutions for today's voice over DSL market," said Jennifer Stagnaro, vice president of marketing at CopperCom. "The ADTRAN/CopperCom partnership assures customers that our broadband DSL services will lead the industry in reliability, performance, and innovation."

The ADTRAN Total Access System is a carrier class integrated access solution that includes a power-packed lineup of Integrated Access Devices (IADs) to address both enterprise and carrier needs. Next-generation features include a modular design, analog and digital voice services, xDSL support, and versatility to accommodate new technologies.

The CopperCom Gateway is a carrier-class, NEBS-compliant platform that converts packet voice to conventional voice signals for delivery to a Class 5 PSTN (Public Switched Telephone Network) switch. The Gateway features true telephony(TM) with seamless integration, flexibility and efficiency, ease of provisioning and management, and 99.999 percent reliability.

About ADTRAN

Established in 1985, ADTRAN, Inc. is a leading provider of deployment and access solutions for carrier and enterprise networks. ADTRAN technologies support more than two million local loops worldwide. More than 500 ADTRAN products support all major digital technologies, including T3, T1, E1, Frame Relay, DDS, HDSL, HDSL2 xDSL, ISDN, and wireless transport. According to Dataquest and IDC, ADTRAN holds revenue-leading positions in the Integrated Access, Frame Relay/DDS, ISDN Extension and HDSL/T1/E1 markets. ADTRAN customers include the Regional Bell Operating Companies, interexchange carriers, GTE, domestic independent service providers, corporate end users, international customers and original equipment manufacturers.

For more information, contact the company at 800 9ADTRAN (800/923-8726) or via e-mail at [e-mail]. On the web, visit www.adtran.com.

About CopperCom

CopperCom is a privately held Silicon Valley company that is Giving Voice to DSL. The company was founded to address a worldwide market that is at the crossroads of voice and data convergence, and is paving the way for the next generation of high-bandwidth applications. CopperCom is leading the market in delivering carrier-class Voice over DSL equipment, both voice gateways and integrated access devices, to incumbent and competitive local exchange carriers. To accelerate market deployment, the company has taken a leadership role in both market education and standards efforts for Voice over DSL. CopperCom has built a strong management team with expertise across both the data and voice networking industries, international depth in European, Asian and North American markets, and management experience in start-ups as well as large multinationals. The company has attracted engineering talent from AT&T, Ericsson, Nortel, Fujitsu, Ipsilon, Fore, Advanced Micro Devices, AFCI, DSC, Network Equipment Technologies, Juniper and Madge Networks. CopperCom can be contacted via telephone at 408/567-9277, fax at 408/567-9558, and the Internet at www.coppercom.com.