Exhibit 99.1

                                  PRESS RELEASE
- --------------------------------------------------------------------------------
                 Shareholders Approve Merger of DSET and ISPsoft

- --------------------------------------------------------------------------------

Bridgewater, NJ - January 31, 2002 - (Nasdaq: DSET) - DSET Corporation and
ISPsoft Inc. today announced that they have closed the merger of ISPsoft into
DSET following approval of the merger by the shareholders of the two companies.
The terms of the companies' agreement to merge include the exchange of all of
the outstanding shares of ISPsoft common and preferred stock for 2,281,143
shares of DSET common stock and certain cash and non-cash considerations.

DSET and ISPsoft have been working together on product development, sales, and
marketing since they announced their intent to merge. The merged company, which
has approximately 90 employees, has two main product lines. In addition to the
electronic-bonding gateways that DSET sells to competitive service providers in
North America, the new company offers solutions that enable any service
provider, globally, to automate the activation and provisioning of services such
as Internet Protocol (IP) based virtual private networks (VPNs).

Dr. Binay Sugla, the new president of DSET and previously president and CEO of
ISPsoft and director of network services and management at Bell Laboratories,
said, "The market for IP based services is clearly a high-growth segment within
the telecom industry. However, the industry has been challenged for years by the
complexities of deploying IP services quickly, reliably, and cost-effectively.
The highly talented staff at ISPsoft, a spin-off of Bell Labs, has created a
unique software solution that enables telecom service providers to rapidly
activate new IP-based services for their enterprise customers. The merger with
DSET creates an exceptionally compatible combination of ISPsoft's technical
achievements and DSET's capacity to aggressively market an expanded product line
worldwide."

"The merger of DSET and ISPsoft is significant for all of our stakeholders,"
said William P. McHale, Jr., DSET's chairman and CEO. "All of us at DSET have
the highest regard for the ISPsoft team who are joining us to go after the IP
market. We are now in a good position in a global market that, although
challenging, is not constrained by a variety of issues, as the competitive
service provider market was in North America.

"The completion of our merger with ISPsoft is also an appropriate time to extend
special thanks to the DSET shareholders who have weathered the downturn in the
telecom industry with us. Although many segments of the industry are still beset
by severe fiscal challenges, we strongly believe that if we execute successfully
relative to our strategic product direction, the result can once again be
sustained profitable growth. Our merger is the achievement of another milestone
on our journey to rebuild DSET and provide our shareholders a return on their
investment."

About DSET

DSET Corporation develops and markets software solutions and related services to
telecommunications service providers around the world. The company's Universal
Provisioning Exchange (UPX) software platform enables any telecommunications
service provider to provision, activate, and manage services such as IP-based
virtual private networks (VPNs) for their enterprise customers. The company also
offers a family of software solutions for competitive service providers that
enables them to exchange information with other telecommunications service
providers to reduce the time necessary to provision new voice and data services
for their customers. Visit www.ispsoft.com for more information about the UPX
platform and www.dset.com for information about the company's electronic-bonding
gateways.







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.

                                       2