Coreon and DSET Accelerate Market Entry for Competitive Carriers

Bridgewater, NJ - September 5, 2000 - (Nasdaq: DSET) - DSET Corporation, a leading supplier of business-to-business e-commerce connectivity solutions for the telecom industry, announced today that Coreon, Inc., the nation's premier Operations Service Provider (OSP), will deploy DSET electronic-bonding solutions as part of its comprehensive network and operations support for competitive carriers. By hosting these operations services and providing the underlying in-house technical support expertise, Coreon accelerates the opportunities for competitive carriers to develop and introduce new products more quickly and efficiently, and in more markets, compared to the cost and time required to develop such capabilities themselves.

With offices in New York City and Fremont, California, Coreon offers carriers access to the complete suite of products that DSET provides for the telecom marketplace. Comparable to its unique DSET-supported operations services is Coreon's innovative billing and payment arrangement: Carriers using Coreon services are charged only on the number of customers that a carrier serves.

The DSET sales-productivity and loop-ordering products that Coreon will deploy include solutions for determining whether potential digital subscriber line (DSL) customers can receive this service at their locations and for ordering DSL circuits. Additionally, Coreon is installing DSET software to provide carriers with the most comprehensive range of carrier-to-carrier interconnection solutions.

"Our customers are looking to Coreon for ways to launch new services faster without the typical delays and expenses associated with developing a new operations support system (OSS) in-house or adapting a legacy OSS to the requirements of new services," said Ted Corbett, vice president of corporate development at Coreon. "With DSET, we have enhanced our ability to help those customers, whether emerging CLECs or existing carriers, with a ready-to-go suite of scalable, secure, multi-service OSSs that ensure highly professional management and execution of all 'back-end' operations."

"In partnering with Coreon, DSET is offering a new dimension of service to competitive carriers," said Phil Cavallo, DSET's senior vice president of worldwide sales and marketing. "In addition to avoiding substantial capital outlays for OSS deployment, new providers will be able to move quickly into the market on a 'pay as you grow' basis while benefiting from the proven capabilities of DSET products coupled with Coreon's support right from the start."

About Coreon:

Coreon, Inc. is the nation's premiere Operations Service Provider for existing and newly emerging telecommunications service providers. With operations in New York City and Fremont, California, Coreon provides end-to-end operations, systems and services for telecommunication carriers in emerging service areas and for newer CLECs offering data, voice, cable, wireless and other services to business and consumers. For more information, visit www.coreon.com.

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 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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Coreon Contacts:

Roger Cawley, Director of Public Relations, Coreon, Inc., 718-889-4200, Ext. 5006, e-mail: rcawley@coreon.com

John Chester, Account Director, The Hoffman Agency, 609-497-6489, e-mail: jchester@hoffman.com

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.