DSET Announces Siebel Validation, Becomes a Premier Software Partner

DSET Upgrades Partnership;
Successfully Integrates DSET ezTroubleAdmin with Siebel eBusiness Applications

Bridgewater, NJ, June 11, 2001 - DSET Corporation (Nasdaq: DSET) today announced that it has joined the Siebel Alliance Program as a Premier Software Partner and that it has successfully validated the integration of the DSET ezTroubleAdmin gateway with Siebel eCommunications. Siebel Systems, Inc. (Nasdaq: SEBL) is the world's leading provider of eBusiness applications software. This is the first DSET product to be validated by the Siebel Validation Program.

Siebel eCommunications is a comprehensive suite of eBusiness applications designed specifically for the communications and media industry. It allows organizations to manage, synchronize, and coordinate customer interactions across all customer touchpoints, including the Web, call center, field, and distribution channels. Designed in close collaboration with the world's leading service providers, Siebel eCommunications delivers unparalleled functionality and can be easily integrated with billing, OSS, and ERP systems.

The DSET ezTroubleAdmin gateway automates the exchange of trouble tickets between communications providers and trading partners to minimize the costs associated with trouble management and reduce the mean time to trouble repair. Integrating the DSET ezTroubleAdmin solution and Siebel eCommunications tightly couples the trouble-management processes of providers and their trading partners. Notable benefits of this integration include improved coordination of service calls, greater accuracy and timeliness of information exchange, and more efficient tracking of Service Level Agreements (SLAs).

"The integration of Siebel eCommunications and ezTroubleAdmin allows service providers and enterprise customers to more efficiently and more effectively manage communications networks," said John Scheifele, Director of Strategic Alliances at DSET. "Leveraging this pre-integrated solution will minimize the time necessary to deploy these applications, which will provide our joint customers with a lower total cost of ownership than with other applications."

"Through this validated solution, DSET and Siebel Systems can provide joint customers with a compatible, seamless solution for managing network trouble, " said Michael Straub, Director Alliances Technical Services for Siebel Systems. "Due to this alliance, DSET and Siebel Systems will continue to work closely together to deliver solutions that maximize customer satisfaction."

Siebel Systems establishes alliances with proven technology leaders to deliver tangible business benefits throughout the enterprise. The Siebel Validation Program applies rigorous technical scrutiny to evaluate and document integrated third-party solutions. By choosing Siebel eBusiness Applications and validated partner solutions, Siebel Systems' customers can pursue a best-of-class software acquisition strategy and quickly deploy the very best solution available.

About DSET:

DSET is a leading supplier of software known as electronic-bonding gateways and the related services that enable 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 them efficiently. 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.

All other trademarks are the property of their respective owners.