NETtel Automates Key Business Processes with DSET E-Commerce Solutions

Bridgewater, NJ - April 12, 2000 - (NASDAQ: DSET) - DSET Corporation, a leading supplier of business-to-business e-commerce connectivity solutions for the telecom industry, announced today that NETtel Communications, Inc. has purchased DSET electronic-bonding gateways to automate the ordering of local loops and high-capacity circuits and to support enhanced 911 service. Based in Washington, D.C., NETtel is a nationwide facilities-based broadband integrated communications provider (ICP) focused on the mid-sized business segment.

NETtel will use DSET's ezLocal and ezAccess ordering gateways to interconnect with Pacific Bell, Ameritech, and the Bell Atlantic North Region. The DSET ez911 gateway will facilitate enhanced 911 service for NETtel's customers by interconnecting the competitive carrier with SCC Communications, a national 911 service bureau. The ez911 gateway automates the exchange of information critical to routing 911 calls so that NETtel customers can obtain appropriate assistance from police, fire, or ambulance services as quickly as possible.

The deployment of DSET's ezLocal and ezAccess gateways will automate and accelerate the processes associated with turning on services for new NETtel customers by enabling application-to-application interconnection between NETtel and its trading partners. Automating what are otherwise manually intensive activities will allow NETtel to make much more efficient use of human, technical, and economic resources. This will facilitate the ordering of special high-capacity circuits as well as access to local phone service for customers in the markets that NETtel is targeting.

"The suite of services offered by DSET gives us the competitive advantage we need to insure our customers are connected quickly," said Jonathan Ebinger, vice president of product marketing. "We chose the best provider to help us meet the demands of the business marketplace."

"Across the U.S., DSET is helping a growing number of competitive carriers like NETtel provide local phone service and create the most value for business customers and other consumers," said Phil Cavallo, DSET's senior vice president of worldwide sales and marketing. "DSET gateway solutions are ideally suited to facilitating a full spectrum of telecom services by interconnecting providers, including ISPs and data-only CLECs, with trading partners in every part of the country."

About NETtel

Washington-based NETtel is a facilities-based integrated communications provider. With offices in more than 22 markets, NETtel offers services throughout the United States and in 200 countries worldwide. Specializing in providing seamless telecommunications applications for mid-sized businesses, NETtel's intelligent network provides fully redundant, nationwide IP/ATM backbone and an integrated services platform for Internet, data, and voice applications. For information about NETtel, call 1-800-403-2745 or visit www.NETtel.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'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

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