Birch Telecom Chooses DSET Business-To-Business E-Commerce Solutions

DSET Ordering Gateway to Support UNE-P Operation

Bridgewater, NJ - April 19, 2000 - (NASDAQ: DSET) - DSET Corporation, a leading supplier of business-to-business e-commerce connectivity solutions for the telecom industry, announced today that Birch Telecom has purchased a suite of DSET products that includes the DSET ezLocal ordering gateway which supports UNE-P operation and ezSubscribe solutions for increasing sales-force productivity. One of the largest competitive local exchange carriers (CLECs) in the Midwest, Birch Telecom currently interconnects with Southwestern Bell in Kansas, Missouri, and Texas.

Short for "Unbundled Network Element-Platform," UNE-P is an operating mode that enables a CLEC to place orders with an incumbent carrier for all of the network elements (loop, switch port, transport, and more) needed to provide phone service for new customers without deploying their own switches. Carriers operating in this mode could achieve substantially higher margins and have lower capital expenses for switches and related equipment.

David Vranicar, Birch senior vice president and chief information officer, praised DSET's wide range of functionality supporting multiple product gateways with numerous trading partners. "In addition to their depth and breadth of products, DSET stays abreast of industry changes and new standards, ensuring the continuity of our quality customer service," Vranicar said.

"We are extremely pleased to have Birch Telecom as a customer," said Phil Cavallo, DSET's senior vice president of worldwide sales and marketing. "Like many of our customers, Birch will integrate their ordering gateway with MetaSolv's Telecom Business Solution^TM (TBS^TM) order management and service fulfillment solution. Also, with the recent release of our ezLocal 2.6 ordering gateway, we were able to satisfy Birch's requirements to migrate customers from incumbent providers to Birch's UNE-P base."

Birch also purchased the DSET ezSubscribe solutions to automate customer service record (CSR) retrieval from the incumbent carrier. Translated into easy-to-understand language, the retrieved information is used to compare Birch's offerings with those of the incumbent. In addition, Birch will deploy DSET's ez911 gateway to automate the transfer of relevant customer information to support 911 service.

About Birch Telecom:

Formed in 1997, Birch Telecom was one of the first companies to be certified in Kansas and Missouri to provide competitive local phone service. Today, Birch provides integrated telecommunications services to small and mid-sized businesses and residential customers in Kansas, Missouri, and Texas. The company's service and product offerings include local, long-distance, and Internet services, as well as phone equipment for businesses in Kansas and Missouri. Birch's Internet Services division provides Internet access, Web hosting, development, and related services. The Birch Telecom Web address is www.birch.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 as 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

DSET and the DSET logo are registered trademarks of DSET Corporation.

MetaSolv is a registered trademark, and MetaSolv Software, Telecom Business Solution, and TBS are trademarks of MetaSolv Software, Inc.

All other trademarks are the property of their respective owners.