Cox Communications Chooses DSET Gateway and Service Suite

Bridgewater, NJ - March 30, 2001 - (Nasdaq: DSET) - DSET Corporation announced today that Cox Communications has purchased a suite of DSET electronic-bonding gateways to automate the pre-order process and the ordering of local lines and special-access circuits for customers, as well as to support long-distance and emergency 911 services. One of the largest competitive telecommunications providers in the U.S., Cox will use the DSET gateways to interconnect with trading partners that include BellSouth, the Verizon North and South regions, Pacific Bell, US WEST, SBC, GTE, and SNET.

Cox entered the cable television business in 1962 and since then has been building high-quality communications networks. The company is rapidly evolving into a full-service provider of advanced video, voice, and data services for homes and businesses. The DSET gateways that Cox contracted for in early March will facilitate the provisioning of voice and data lines for the company's growing customer base.

Cox also purchased maintenance and change-management services from DSET. The change-management services will ensure continuously efficient interconnection between Cox and trading partners such as the former regional Bell operating companies (RBOCs) should a trading partner change any unique data requirement associated with interconnection. The DSET change-management team can help a client implement necessary software modifications in a matter of days, whether the changes are initiated by an individual trading partner or result from the adoption of new industry-wide standards.

"We selected DSET's suite of interconnection gateway products because they integrate well with our other core systems," said Scott Hatfield, Cox Communications senior vice president and CIO. "These products will automate ordering and processing of local service requests and access service requests, which will enable Cox to meet our high standards for providing excellent customer service."

"We are proud to have been chosen to play a key role in the creation of a nationwide trading partner network that links Cox with a group of major RBOCs," said William P. McHale, Jr., DSET's president and chief executive officer. "Working closely with Cox and their systems integrator, we believe that we will all be successful in reducing the amount of time required to provision new services for their expanding customer base."

About Cox Communications:

Cox Communications serves approximately 6.2 million customers nationwide, making it the nation's fifth largest cable television company. A full-service provider of telecommunications products, Cox offers an array of services, including Cox Cable; local- and long-distance telephone services under the Cox Digital Telephone brand; high-speed Internet access under the brands Cox@Home, Road Runner, and Cox Express; advanced digital video programming services under the Cox Digital Cable brand; and commercial voice and data services via Cox Business Services. Cox is an investor in telecommunications companies that include Sprint PCS and Excite@Home, as well as programming networks that include Discovery Channel, The Learning Channel, Outdoor Life, and Speedvision. More information about Cox Communications can be accessed on the Internet at www.cox.com.

About DSET:

DSET Corporation is a leading supplier of software and services that enable telecommunications providers to implement electronic Trading Partner Networks, which significantly reduce the time required to provision services for customers and resolve service outages to maintain high service quality and ensure customer retention. 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

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