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Now Featuring the e256(tm), Mercury Brings it All Together for Wireless and Wireline Carriers:Premier Voice Quality, Unsurpassed Broadband Interface Flexibility, Superb Price/Performance

Framingham, MA - May 20, 2002 - NMS Communications (NASDAQ: NMSS), the leading supplier of technology for tomorrow's networks, has unveiled a new version of its Mercury Broadband Echo Cancellation and Voice Enhancement System that allows service providers to offer superior voice quality and gain a highly cost-effective option for broadband terminations - all while benefiting from the cost savings that results from the system's unrivaled high density and compelling price per channel. By providing more echo cancellation flexibility and capacity as well as unmatched voice quality, Mercury features an extremely flexible and broad range of optical interface capabilities along with Studio Sound., the industry's most comprehensive suite of voice enhancement capabilities.

As call traffic volumes continue to climb, the need for carriers to migrate from electrical to optical terminations increases. As a result, the introduction of the Mercury system with OC-3 and STM-1 optical interfaces not only provides a competitive offering for voice quality on high-bandwidth networks, but also the same shelf within a Mercury system can include electrical (STS-1, DS-3) as well as optical terminations to achieve flexibility and investment protection unmatched in the market today.

Available immediately, the carrier-grade Mercury system is also built upon the company's recently announced e256(tm) device for excellent echo cancellation performance. The e256 is purpose-built ASIC technology that provides unmatched voice quality, the highest channel density (256 channels), and the lowest power consumption in an offering of its kind.

Mercury represents a flagship entry in the NMS line of voice enhancement systems, acquired last year from Lucent Technologies and built on pioneering innovations that originated at Bell Labs. These systems are deployed throughout many of the world's largest telecommunications networks, including Verizon Wireless and Long Distance, China Unicom, NTT DoCoMo, US Cellular, Nextel, AT&T Wireless, France Telecom, and Leap Wireless.

Voice Quality: Fundamental to Success

"The difference that premium voice quality makes - and the challenges that are typically inherent to achieving call quality especially in mobile settings - are essential concerns for service providers," said Scott Ellison, Program Director Wireless & Mobile Communications at IDC. "Systems such as NMS Communications' Mercury, which presents a comprehensive approach to enhancing voice quality in addition to flexible deployment and investment protection, key into service providers' needs by being effective as well as cost-effective."

Excellent voice quality is fundamental to success is in today's competitive wireless world: Subscribers are more satisfied and more likely to make calls when they know that voice quality will be optimal under all conditions, even in noisy environments. Besides improving subscriber satisfaction and customer retention, better voice quality also leads to increased usage. For example, wireless carriers gain an opportunity for increased revenue when subscribers use extra minutes in addition to their monthly calling plans.

"With the addition of optical interfaces and Studio Sound, Mercury is by far and away the world's most capable and versatile high-density system for broadband voice enhancement," said Clarke Ryan, senior vice president and general manager of NMS' Voice Enhancement Systems business. "By matching industry-leading functionality with excellent price/performance, Mercury is well-equipped to help wireless and wireline service providers reap all the benefits of superior voice quality - customer satisfaction, increased usage, and higher retention rates - at dramatically reduced capital expense and operational costs."

At SUPERCOMM 2002 in Atlanta, June 2-6, NMS will showcase its voice enhancement systems and Studio Sound software in the Wireless Zone at booth #32453. In two related announcements today, the company is also introducing Studio Sound and Quartet, the highest-density, highest-performance T1 echo cancellation system on the market. Links to additional news releases: and

Crystal Clear Voice, Flexible Interfaces, Unmatched Capacity

Mercury with Studio Sound combines advanced echo cancellation performance and unmatched shelf capacity to enhance the voice quality of any network. The Mercury system makes the most of the e256 device by using it to power Studio Sound, the only software that pairs state-of-the-art noise reduction and noise compensation with other robust voice quality enhancement features to create an optimal listening environment for both parties in a conversation - vital in noisy mobile settings, such as moving automobiles, train stations, or crowded restaurants. Studio Sound eliminates both electrical as well as acoustic echo in any mobile or long-distance network application. In addition, a patent-pending Dynamic Speech restoration feature reverses the degradation caused by repeated voice coding and decoding in mobile-to-mobile calls.

Unlike any other product on the market today, the flexible Mercury system can handle 4,032 channels per 23-inch shelf equipped with STS-1, DS-3, OC-3, or STM-1 interfaces, or multiple combinations, via a simple software provisioning change. Five fully loaded shelves in one bay accommodate more than 20,000 voice channels.

With the ability to accommodate optical as well as electrical interfaces in one high-density system, service providers benefit from capital and operational savings and can grow as the network dictates. In contrast with competitive offerings, Mercury eliminates the need to replace entire systems to upgrade from electrical to optical terminations. The system further reduces capital expense by removing the requirement for separate multiplexers to convert from electrical to optical - allowing traffic signals to enter via an STS-1 line and exit on an OC-3, for example.

About NMS' Voice Enhancement Systems

With more than 10 million channels deployed by over 100 leading service providers and mobile operators, NMS' voice enhancement systems - recently acquired from Lucent Technologies and built on pioneering innovations that originated at Bell Labs - deliver exceptional voice clarity and quality on wireless and wireline networks around the world. The NMS family of carrier-grade echo cancellation and voice enhancement systems deliver the industry-leading voice quality that helps service providers increase mobile usage, enhance customer loyalty, increase revenue, and reduce costs.

Without an assist from such equipment, echo, delays, and other conditions degrade the quality of voice calls. All wireless and long-distance wireline voice traffic, as well as most voice over IP (VoIP) traffic, passes through some type of echo cancellation or voice enhancement product for this reason. These systems also improve the performance of speech-enabled applications and services - such as voice-activated dialing, speech-enabled contact centers, and voice portal applications - that are designed to increase efficiency and user satisfaction while driving additional revenue for service providers.

About NMS Communications

NMS Communications (NASDAQ: NMSS) designs, delivers, and supports technology-leading systems and system building blocks for innovative voice, video, and data services on wireless and wireline networks. NMS products and services help the world's top communications equipment suppliers, solution developers, and wireless operators bring their applications and services to market faster and at lower costs. Headquartered in Framingham, Massachusetts, and with offices around the world, NMS has a rich history of technology innovations that advance the growth of the global communications industry. These achievements include the world's first complete open IP gateway, the first complete open packet media server, and the first complete open solution for voice applications and services.

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Statements in this document expressing the beliefs and expectations of management regarding future performance are "forward- looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are based on management's expectations as of the date of this document and are subject to uncertainty and changes in circumstances. Actual results may differ materially from these expectations due to risks and uncertainties including, but not limited to, a continued slowdown in communications spending, the implementation of the Company's strategic repositioning and market acceptance of the Company's new solutions strategy, quarterly fluctuations in financial results, the Company's ability to integrate efficiently the business and technologies it has acquired and to exploit full the value of such technology and its strategic partnerships and alliances, the availability of products from vendors and other risks. These and other risks are detailed from time to time in the Company's filings with the Securities and Exchange Commission, including the Company's annual report on Form 10-K for the year ended December 31, 2001. In addition, while management may elect to update forward-looking statements at some point in the future, management specifically disclaims any obligation to do so, even if its estimates change. Any reference to our website in this press release is not intended to incorporate the contents thereof into this press release or any other public announcement.

NMS Communications and e256 are trademarks and Studio Sound is a registered trademark of NMS Communications Corporation. All other product or corporate references may be trademarks or registered trademarks of their respective companies.

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