ezAccess 3.1 Now Available from DSET

New Gateway Shipped in Advance of Industry Standards Change

Bridgewater, NJ - May 21, 2001 - (Nasdaq: DSET) - DSET Corporation announced today that it has shipped a new version of its ezAccess gateway, which automates the processing of access service requests (ASRs) that telecommunications providers must exchange with trading partners when ordering bandwidth needed to provision special access/transport and switched access services.

ezAccess 3.1 can streamline the operations of providers that include competitive local exchange carriers (CLECs), incumbent local exchange carriers (ILECs), data local exchange carriers (DLECs), carriers that wholesale transmission facilities to other providers, and interexchange carriers (IXCs). The DSET software solution can be deployed either as a stand-alone system or integrated with an order management system.

ezAccess 3.1 offers enhancements that improve the tracking of orders and record keeping, and it supports automated interconnection with third-party fax servers for greater efficiency in sending ASRs to trading partners that do not have their own batch-processing capability. It is also compliant with the latest industry-standard Access Service Ordering Guidelines, ASOG 23, scheduled to take effect on June 9, 2001.

"A few months ago, we enhanced ezAccess with the capability for full bi-directional ASR automation," said Vera Helen Clements, DSET's ezAccess product manager. "ezAccess 3.1 continues the dynamic pace that we've set for the development of all DSET gateways in 2001.

"It's especially significant that we've rolled out this solution in advance of ASOG 23. Customers already using this gateway can complete installation and testing of ezAccess 3.1 within the industry-specified implementation timeframe. New customers can also benefit by initiating testing with trading partners and satisfying all ASOG 23 requirements that much sooner. Being ready for ASOG 23 with a highly capable electronic-bonding product gives both current and new customers one more significant advantage in the intensely competitive telecom marketplace."

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.

x x x

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.