DSET Announces ezPreOrder 1.2

Expands Capabilities for Automated Retrieval and Processing of Customer Service
Information for Competitive Providers

Bridgewater, NJ - June 21, 2001 - (Nasdaq: DSET) - DSET Corporation announced today that it has shipped a new version of the ezPreOrder gateway currently in service at multiple customer sites. ezPreOrder 1.2 adds support for electronic bonding with two new trading partners, Qwest and GTE, to complete interconnection coverage for all regions served by the major local exchange carriers.

ezPreOrder automates the first phase of transitioning customers to competitive service providers from trading partners such as incumbent carriers. The pre-order transactions performed determine service availability and facilitate the correct completion of orders sent to trading partners, considerably reducing order turn-around intervals and operational costs.

Built on the Java™ J2EE™ platform, ezPreOrder automates a wide range of pre-order functions, including the retrieval of customer service information (CSI) from trading partners, address validation, telephone-number reservation, and xDSL loop qualification. Validating service addresses before sending orders to a trading partner eliminates a major cause of order rejection and costly reprocessing.

"One of the hallmarks of DSET's presence in the competitive telecom market has been our responsiveness to clients' needs for greater functionality in current products, in this instance the ezPreOrder gateway," said DSET product planner Akshay Goel. "Every competitive provider needs to maximize efficiency, beginning with the pre-order process. The enhancements that ezPreOrder 1.2 offers make it easier to obtain information essential for migrating customers from trading partners and help to ensure that services are turned on for new customers as quickly as possible."

About DSET:

DSET is a leading supplier of software known as electronic-bonding gateways that enable competitive service providers in the telecommunications industry to implement an automated Trading Partner Network (TPN). A TPN plays a critical role in lowering the cost of acquiring customers, reducing the amount of time required to turn on services for new customers, and minimizing the time required to resolve service outages to ensure higher customer satisfaction and less customer turnover. DSET provides the installation, training, interoperability-testing, and maintenance services needed to put TPNs into production and maintain efficient operation. 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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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

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

Java and J2EE are trademarks of Sun Microsystems, Inc. in the United States and other countries.

All other trademarks are the property of their respective owners.