DSET Ships New Version of ezLongDistance Gateway

Bridgewater, NJ - April 30, 2001 - (Nasdaq: DSET) - DSET Corporation today announced the availability of a new version of its ezLongDistance gateway. ezLongDistance helps to ensure that the customers of competitive local service providers also receive service from the long-distance carriers they have chosen by automating the exchange of data between local and long-distance providers.

ezLongDistance 2.1 features a CORBA interface that can make integration with a competitive carrier's order management system faster and more efficient. In addition, the gateway's graphical user interface now supports completely bi-directional data exchange. This can help to accelerate the process of ensuring that a new customer's long-distance calls are handled as requested, and that service is quickly switched when a customer decides to change long-distance providers.

As with all DSET solutions, the Java-based ezLongDistance 2.1 gateway complies with the latest relevant industry standards. The new version is fully compliant with CARE ISI 10, industry guidelines issued by the Subscription Committee of the Ordering and Billing Forum.

"ezLongDistance 2.1 is just one of the new products that we plan to introduce in 2001," said Jimmy Jobe, DSET's senior vice president of product development and product management. "We've already announced the enhanced version of our ASR gateway, and there will be other significant product announcements throughout the year, including important news about our ezLocal ordering gateway."

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

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