DSET Corporation to Trade Under "DSETD" for 20 Days

Bridgewater, NJ - August 21, 2001 - (Nasdaq: DSET) - DSET Corporation today announced that the company's common stock will trade on the Nasdaq National Market under the symbol "DSETD" for 20 trading days beginning on August 22, 2001.

The temporary addition of the "D" to the DSET symbol is required by Nasdaq pursuant to the one-for-four reverse stock split that the company announced on August 14. The company's stock will begin trading on a post-split basis on August 22.

At the conclusion of 20 trading days, the additional "D" will be removed and the trading symbol will revert to "DSET."

About DSET Corporation

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 provision new phone services for customers, and minimizing the time required to resolve service outages to ensure higher customer satisfaction and less customer churn. 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.

DSET Contacts

Financial: Bruce Crowell, Chief Financial Officer, 908-526-7500 Ext. 1775,
e-mail: bcrowell@dset.com

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