Latest DSET Web Seminars to Feature DSL Solution Suite, Trouble Management, and Sales-Quote Automation for CLECs

Bridgewater, NJ - June 6, 2000 - (NASDAQ: DSET) - DSET Corporation, a leading supplier of business-to-business e-commerce connectivity solutions for the telecom industry, will offer a new series of free, interactive Web seminars focused on pre-qualifying DSL customers, automating DSL ordering, electronically exchanging trouble ticket information, generating comparative sales quotes, and minimizing the potential problems of electronic OSS interconnection. Three 45-minute seminars exploring these key competitive telecom topics will be given without charge on June 9, June 16, and June 23.

Participants at work or at home will be able to see and hear presentations by experts in each of these areas. The interactive seminars will also enable those who sign up to ask questions and share their views and concerns in real time with industry colleagues across the United States.

"The series of Web seminars that we ran in 1999 attracted a diverse telecom audience and clearly indicated the level of interest in sharing information about the benefits of electronically interconnecting operations support systems between carriers," said Phil Cavallo, DSET's senior vice president of worldwide sales and marketing. "The competitive telecom market is evolving very quickly, and since the 1999 seminars we've rolled out new products to meet a greater range of provider's needs, including the automation of DSL pre-qualification and ordering. Our new seminars will allow us to share the experience and insights we've gained in these areas with anyone who has access to the Web and a phone line."

All those registering for the seminars will be eligible for a special promotional offer from DSET.

Seminar details, promotion information, and electronic registration forms are available at www.dset.com/gatewayseminar.html.

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.

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.

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