Visual Networks and Inverse Network Technology Agree to Jointly Develop and Market Integrated IP WAN Management

System Interoperability Will Enable Integration of Remote Access

and Dedicated Data Services

May 26, 1999, 01:00 ET from Visual Networks, Inc.

    ROCKVILLE, Md. and SUNNYVALE, Calif., May 26 /PRNewswire/ -- Visual
 Networks(R), Inc. (Nasdaq:   VNWK), the originator and leading provider of WAN
 service level management systems, and Inverse Network Technology Inc., the
 leading provider of service-level management systems for IP network and
 application services, announced today that the two companies have agreed to a
 joint development enabling seamless interoperability between Inverse's IP
 InSight and Visual Networks' Visual UpTime.  This builds on Visual Networks'
 Visual UpTime for IP networks operating on dedicated facilities through its
 Service Reliability Architecture, the strategy to extend Visual UpTime to
 support emerging IP WAN services (see separate release).
     This will result in a more complete and integrated solution for the
 management of IP networks and services including dial up and dedicated
 services.  In addition, this will provide for consistent management of all
 data services from frame relay through VPNs.  Visual Networks and Inverse have
 also signed an agreement covering joint sales and marketing activities, which
 will ensure coordination for customers in common.  This marks the
 collaboration between the two leading WAN service level management leaders.
 Visual Networks dominates the market for dedicated services such as frame
 relay, ATM and IP, while Inverse has emerged as the leading solution for IP
 network and application services.  Each company already has compatible
 integration capabilities within their respective products.  The joint
 development will leverage these capabilities to deliver the functionality
 critical to providing increased network reliability:
     Inter-agent Communications: Inverse and Visual Networks will enable
 communications between IP InSight Clients and Service Agents and Visual UpTime
 agents.  This will permit the measurement of end-to-end network delay and the
 exchange of key performance metrics and status information between Visual
 Networks' agents located at enterprise locations and Inverse agents on
 remote-access and LAN-connected PCs as well as predefined test points within a
     System-Level Data Integration: Inverse and Visual Networks have agreed to
 develop communications mechanisms between their systems.  This will allow IP
 InSight to draw data from Visual UpTime for presentation to IP InSight users
 and also allow Visual UpTime to present IP InSight information to Visual
 UpTime users.
     User Interface Launch Integration: User interface launch mechanisms will
 be jointly developed, allowing each system to use all or selected views of the
 other system's user interface.  This will provide users of both systems with a
 common application interface.
     "As IP becomes increasingly dominant in enterprise networks, service
 providers will have to ensure that they can provide equivalent reliability for
 all data services," said Scott Stouffer, president and CEO, Visual Networks.
 "Visual UpTime is the model by which service providers reduce their total cost
 of operations and their customer's cost of ownership while providing much more
 reliable networks.  By partnering with Inverse, we can ensure that service
 providers can provide seamless management across their heterogeneous data
     "In order to be successful in providing IP services, service providers
 must be able to prove network performance," said Michael Watters, president
 and CEO at Inverse, Sunnyvale, CA.  "Through our relationship with Visual
 Networks, service providers will be able to measure service performance from
 virtually any point in a network, including the desktop.  Such information is
 required to create mutually beneficial partnerships and accountability between
 service providers and their customers."
     Joint development work will begin immediately.  Ongoing development to
 produce the complete systems integration will be completed in 2000.  Joint
 sales and marketing activities have been initiated and will continue in
 conjunction with development work.
     About Visual UpTime
     Visual UpTime automates the collection, interpretation, and presentation
 of WAN service level management information.  A key component of the system is
 the unique integration of expert WAN performance, measurement, and analysis
 functionality into network access equipment.  The system, including an SQL
 database and client software, enables full access to real-time and historical
 performance data, full packet capture and protocol decode, bandwidth planning,
 as well as detailed reporting from the operational to executive level.  In
 addition, Visual UpTime presents its management information in simple
 graphical formats while supporting a variety of management platforms,
 including web browsers.
     About Visual Networks
     Visual Networks, Inc. designs, manufactures and sells WAN service level
 management systems for statistically multiplexed technologies such as frame
 relay, IP/Internet, and ATM.  Visual Networks' Visual UpTime system combines
 WAN access functionality with innovative software for performance monitoring,
 troubleshooting and network planning.  Visual UpTime provides instrumentation
 for network performance measurement and analysis that allows WAN service
 providers to achieve service levels required by subscribers and to lower
 operating costs associated with statistically multiplexed services.  Visual
 Networks is headquartered in Rockville, Maryland, with sales offices
     This press release may contain forward-looking information within the
 meaning of Section 27A of the Securities Act of 1933 and Section 21E of the
 Securities Exchange Act of 1934, and is subject to the safe harbor created by
 those sections.  Visual Networks assumes no obligation to update the
 information contained in this press release.  Visual Networks' future results
 may be impacted by its ability to implement its provider deployment model, its
 lengthy sales cycle, dependence upon its major customers, risks associated
 with rapid technological change and the emerging services market, potential
 fluctuations in its quarterly operating results, its dependence on sole and
 limited source suppliers and fluctuations in component pricing and its
 dependence upon key employees.  Visual Networks' future results may be
 impacted by other risk factors listed from time to time in its SEC reports,
 including, but not limited to, the Company's Registration Statement on Form
 S-3 dated March 2, 1999, its Form 10-Qs and its Annual Report on Form 10-K.
     For more information about Visual Networks and Visual UpTime, contact
 Visual Networks, Inc., 2092 Gaither Road, Rockville, Maryland 20850, at
 800-240-4010, or via the World Wide Web at .
     About Inverse IP InSight
     Inverse IP InSight is a leading service-level management system for IP
 networks that provides a true, end-to-end view of IP network and application
 services.  The system lets service providers and enterprises effectively
 monitor services and provide service level agreements (SLAs), offer new levels
 of end-user customer care and measure end-to-end network and application
 performance.  Inverse's media-independent agent technology allows IP InSight
 to measure the performance of IP network and application services in both
 remote-access and dedicated networks.
     About Inverse Network Technology
     Inverse Network Technology is the leading provider of software solutions
 and measure service quality for applications such as remote access
 outsourcing, virtual private networks (VPNs) and electronic commerce.  Inverse
 helps ISPs and corporations enhance performance and reliability and improve
 customer satisfaction of their IP network and application services.  Founded
 in 1996, the company is located in Sunnyvale, California.  For more
 information, call 408-616-6200 or visit the Inverse Web site at .

SOURCE Visual Networks, Inc.