LightNetworks to Build Telecom Service Structure with DSET Electronic-Bonding Solutions

Bridgewater, NJ - January 31, 2000 - (NASDAQ: DSET) - DSET Corporation, a leading supplier of business-to-business e-commerce solutions for the telecom industry, announced today that LightNetworks will deploy a comprehensive suite of DSET electronic-bonding products to launch service for customers in the southeastern U.S. and to interconnect with BellSouth, GTE, and Qwest. A next-generation competitive local exchange carrier (CLEC), LightNetworks has purchased DSET solutions for automating pre-order, ordering, and post-order business processes to facilitate the company's plans for entering the telecom market in early 2000.

"We are very excited about the deployment of the DSET suite in support of our order-management process," said Jeff Smock, chief executive officer of LightNetworks. "This solution continues to leverage our strategic focus of automated, e-commerce-based service provisioning for our customers."

The DSET electronic-bonding gateways purchased by LightNetworks will be implemented in combination with MetaSolv Software's Telecom Business Solution™ (TBS™) system. This will provide LightNetworks with fully integrated, flow-through order management.

"In choosing both DSET solutions and MetaSolv's order-management system, LightNetworks has joined the majority of our customers who have made the same decision," said Phil Cavallo, DSET's senior vice president of sales and marketing. "Most of the more than 20 CLECs that have purchased our solutions employ MetaSolv's TBS system as well. This clearly demonstrates the telecom industry's high level of confidence in a combination of products that is seen as providing the best set of capabilities for electronic bonding and operations support."

About LightNetworks:

Atlanta-based LightNetworks utilizes facility-based DSL solutions to offer an integrated product set of voice, Internet access and high-speed data to meet the demands of small and medium sized customers. LightNetworks will begin offering its services in seven southeast U.S. cities in early 2000. Initial markets include Atlanta, Charlotte, Jacksonville, Miami, Nashville, Orlando, and Tampa.

About DSET:

DSET Corporation is a leading provider of business-to-business e-commerce 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 as 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.

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.

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LightNetworks Contacts:

E. Jay Emmet, Senior Vice President, Sales and Marketing, 404-320-3021,
e-mail: jay.emmet@lightnetworks.com

DSET Contacts:

Media Relations: Kathy Claxton, Corporate Marketing Communications Manager,
908-526-7500 Ext. 1280

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

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

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