DSET and MetaSolv Solutions Cited in National Award for Allegiance Telecom

Bridgewater, NJ and Plano, TX - July 17, 2000 - (Nasdaq: DSET) - DSET Corporation's local-loop ordering gateway, ezLocal, and MetaSolv Software, Inc.'s (Nasdaq: MSLV) Telecom Business Solution^TM (TBS^TM) order management and service fulfillment solution were cited as key elements in the operations support system (OSS) architecture that won the SUPERQuest Award presented to Allegiance Telecom, Inc., a major facilities-based competitive local exchange carrier, at SUPERCOMM 2000. The award was sponsored by CMP Media's tele.com and Network Magazine.

The DSET electronic-bonding gateway for ordering local loops from the former regional Bell operating companies (e.g. Bell Atlantic) has been deployed in combination with MetaSolv's TBS solution for nearly two years. The Allegiance operations support system was recognized as the best application in the "Best Built Public Network or Service/OSS" category. This advanced system has cut the interval required to switch customers from Allegiance's trading partners from 30-45 days to 10-15 days.

Allegiance Telecom, DSET and MetaSolv made national news in January 1999 when they announced the first successful implementation of automated ordering with Bell Atlantic. Since then, Allegiance has interconnected with Southwestern Bell, Pacific Bell, and Ameritech. Using the DSET ezLocal gateway, Allegiance expects to be bonded electronically with every ILEC in its markets by the end of 2000.

"The SUPERQuest award is yet another sign noting the groundbreaking importance of Allegiance's electronic bonding achievement," said Dana Brown, MetaSolv's vice president of marketing. "It also highlights the importance of building and maintaining a relationship with alliance partners in order to provide the most effective solutions to our customers."

"DSET and MetaSolv have worked together to enable electronic-bonding successes such as that achieved by Allegiance, beginning with Allegiance's pioneering interconnection with Bell Atlantic," said Phil Cavallo, DSET's senior vice president of worldwide sales and marketing. "Recognizing the complexities of implementing electronic bonding in diverse production environments, DSET and MetaSolv together established a testing and integration lab in 1999 specifically to streamline the deployment of our products. Knowledge gained at the lab and growing experience in the field promise to give the benefits now enjoyed by Allegiance to many more carriers."

About Allegiance Telecom
Based in Dallas, Texas, Allegiance Telecom (Nasdaq: ALGX) is a facilities-based CLEC that offers businesses a complete package of telecommunications services, including local, long distance, international calling, high-speed data transmission, and Internet services. The company is targeting 36 major metropolitan areas in the U.S. with its "one-stop shopping" approach. Allegiance is currently operational in the following 21 markets: Atlanta, Baltimore, Boston, Chicago, Dallas, Denver, Detroit, Fort Worth, Houston, Long Island, Los Angeles, New York, Northern New Jersey, Oakland, Orange County, Philadelphia, San Diego, San Francisco, San Jose, St. Louis and Washington D.C. Allegiance's Web address is: www.allegiancetele.com.

About DSET
DSET Corporation is a leading provider of business-to-business e-commerce connectivity solutions for the global telecommunications marketplace. The DSET suite of electronic-bonding gateways is designed to interconnect the operations support systems (OSSs) of service providers that must exchange information and share network capabilities with trading partners to provision and maintain a growing range of services for customers in the competitive telecom market. DSET's local number portability solutions play a key role in enabling business and residential customers to change service providers without changing their local phone numbers. DSET is headquartered in Bridgewater, New Jersey, and the company's Web site can be viewed at www.dset.com.

About MetaSolv Software, Inc.
MetaSolv Software, Inc. (Nasdaq: MLSV), headquartered in Plano, Texas, was founded in 1992. MetaSolv is a leading provider of order management and service fulfillment solutions for next generation communications providers. MetaSolv's Telecom Business Solution (TBS) software product suite integrates a communications provider's business from network planning and engineering to operations and customer care. With MetaSolv's TBS software, communications providers can quickly and efficiently respond to market demand, optimize their service fulfillment processes, and build stronger relationships with their customers. MetaSolv is an active participant in the Ordering & Billing Forum (OBF), TeleManagement Forum (TMF) and the new Application Service Provider (ASP) Consortium. MetaSolv has regional offices in Chicago, Denver, Atlanta, McLean, VA and London. MetaSolv's web site is www.metasolv.com, or contact MetaSolv directly at (800) 747-0791.

Statements regarding financial matters contained in this press release, other than historical facts, are forward-looking. Since all statements about DSET's plans, estimates, and expectations are based on current projections that involve risks and uncertainties, and are subject to change at any time, the company's actual results may differ materially from expected results. Investors should consider these risks and uncertainties, which are discussed in documents filed by DSET with the Securities and Exchange Commission. These documents identify important factors that could cause the actual results to differ materially from those contained in the projections or forward-looking statements. DSET expressly disclaims any obligation to update any forward-looking statements.

This press release contains forward-looking statements that are based upon current expectations and involve a number of risks and uncertainties. Using the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, MetaSolv cautions you that these statements may be affected by important factors that could cause actual results to differ materially from those expected, including (among others) those factors described in MetaSolv's reports on file with the Securities and Exchange Commission, including the Company's Annual Report on Form 10-K for the year ended December 31, 1999, and any subsequent Quarterly Report on Form 10-Q.

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DSET Contacts:

Media Relations: Dean Maskevich, Marketing Communications, 908-526-7500 Ext. 1366, e-mail: dmaskevi@dset.com

Investor Relations: John P. Murphy, Westfield Investor Relations, 908-233-1558, e-mail: westfieldir@worldnet.att.net

MetaSolv Contacts:

Media Relations: Kimberlee Lueders, Director, Marketing Communications, 972-403-8305, e-mail: klueders@metasolv.com

DSET and the DSET logo are registered trademarks of DSET Corporation.

MetaSolv is a registered trademark, and MetaSolv Software and TBS are trademarks of MetaSolv Software, Inc.

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