Filed by DSET Corporation
                       Filed Pursuant to Rules 165 and 425 promulgated under the
                            Securities Act of 1933, as amended, and deemed filed
                                   Pursuant to Rule 14a-12 promulgated under the
                                     Securities Exchange Act of 1934, as amended

                                                  Subject Company:  ISPSoft Inc.

                                                    Commission File No.333-65898


[GRAPHIC OMITTED]                                                 PRESS RELEASE

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                      DSET Ships New Number-Porting Gateway

          Provides Capabilities to Implement Latest Industry Standards

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Bridgewater, NJ - January 28, 2002 - (Nasdaq: DSET) - DSET Corporation today
announced shipment of the latest version of its ezNumberPort electronic-bonding
gateway. ezNumberPort enables local number portability (LNP) by automating
interconnection between competitive service providers and the eight regional
Number Portability Administration Centers (NPACs) in the United States and
Canada. The new gateway is already scheduled for installation at two current
DSET clients serving the northeastern and southeastern U.S.

Mandated by the Telecommunications Act of 1996, LNP allows a customer switching
from an incumbent carrier to a competitive local service provider to keep the
same telephone number. This requires that the incumbent carrier and the
customer's new provider exchange data with one or more NPACs. Widely deployed by
competitive providers in the United States, ezNumberPort helps a provider
automate activation of local service at ported numbers by electronically
interconnecting with the appropriate NPACs, which are managed by NeuStar, Inc.

The new ezNumberPort gateway conforms to the current version (3.1) of the NPAC
SMS Interoperable Interface Specification issued by the North American Numbering
Council (NANC). It is also compatible with previous releases of the NANC
specifications. As certified for conformance with NANC 3.1, ezNumberPort now
offers capabilities that include automated porting of groups of numbers and
numbers within a specified range.

A very significant ezNumberPort benefit is that it provides a cost-effective
alternative to the generic NPAC interface for downloading reports about pending
number ports, which could be tens of thousands annually for a successful
competitive carrier. Regularly downloading these reports allows a service
provider to manage operations much more efficiently and economically. For
example, notification of numbers scheduled for porting to a competitor can be
used to trigger efforts focused on retaining customers or minimizing customer
churn.

"DSET has been a leader in LNP technology ever since it became part of the
telecom infrastructure of the U.S," said Jeff Gill, DSET's vice president,
professional services. "DSET software was used to develop NPAC systems in use
today, and the successive

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releases of our ezNumberPort gateway have made it increasingly easy for
competitive providers to turn on the ported numbers of customers they've
won from the incumbents. Our product-development and customer engineering teams
continue to demonstrate DSET's commitment to providing our production customers
with essential LNP capabilities and to offering potential customers the best
solution available for bonding electronically with the NPACs."

In recognition of the telecom industry's challenging fiscal environment, DSET
continues to offer the broadest suite of interconnection gateways to its
existing 31 production customers as well as to other interested service
providers in the United States under three distinct pricing models: a perpetual
license, a monthly rental program and/or a hosted implementation via BizTelOne's
clearinghouse. Detailed information about DSET's gateway offerings can be
obtained by sending e-mail to info@dset.com.

About DSET

DSET Corporation is a supplier of electronic-bonding gateways that enable
communications providers to implement electronic Trading Partner Networks
(TPNs). 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. The company also offers
provisioning and activation solutions for IP-based services such as virtual
private networks (VPNs) at a fraction of the cost and time of conventional
methods. 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.

                                      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


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

All other trademarks are the property of their respective owners.


Caution Required by SEC Rules
- -----------------------------

Investors and security holders are urged to read DSET's proxy
statement/prospectus regarding its proposed combination with ISPSoft Inc.
because it will contain important information about the transaction. The proxy
statement/prospectus is filed with the SEC.  Investors and security holders
may obtain a free copy of the proxy statement/prospectus and other documents
filed by DSET with the SEC at the SEC's Web site at www.sec.gov.  The proxy
statement/prospectus and these other documents may also be obtained for free
from DSET.  DSET and its executive officers and directors may be deemed
to be participants in the  solicitation  of proxies  from  stockholders of DSET
with respect to the transactions contemplated by the merger agreement.
Information regarding such officers and directors is included in DSET's proxy
statement/prospectus.


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