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Press Release dated May 26, 2003

Sprint Canada Receives Cisco Powered Network Designation for its Multi-service
VPN Offering

(TORONTO, Ontario), May 26, 2003  Sprint Canada Inc., a national provider of
residential and business telecommunications services and a wholly-owned
subsidiary of Call-Net Enterprises Inc., (TSX: FON, FON.B) today announced that
its multi-service VPN solution has received Cisco Powered Network designation
from Cisco Systems.

Cisco Powered Network designation certifies that Sprint Canada has the network
infrastructure to provision and support the most bandwidth intensive virtual
private network (VPN) applications, such as voice, video/multimedia, and data
transmission in three specific areas of performance: network delay, jitter and
packet or data loss.

The deployment of business-critical applications, such as IP voice and video
across a VPN network requires a secure and reliable supporting infrastructure.
With Cisco Powered Network designated services, enterprise customers can more
easily identify carriers that are able to deliver the integrated voice, video
and data services they want and need, said Lui Fogolini, vice-president of
service provider operations at Cisco Systems Canada.

The Cisco Powered Network designation of our multi-service VPN solution
demonstrates our commitment to providing the highest-quality network
infrastructure and gives our customers assurance from a third-party that we
have used industry-leading technology to build a state-of-the-art network,
said Duncan McEwan, president and chief operating officer of Sprint Canada Inc.
Our North American partner, Sprint, also offers a Cisco Powered Network
service for IP VPNs, further strengthening our ability to offer seamless North
American VPN service for our cross-border customers.

Sprint Canadas IP network is certified to meet the following criteria: less
than 60 milliseconds network delay, less than 20 milliseconds of jitter, and
less than 0.5 per cent of packet or data loss.

To date, most IP VPNs have been used primarily to transport data. However, many
Canadian businesses are looking for ways to layer voice and video applications
to their corporate virtual private networks in order to create multi-service
VPNs and reap the full benefits of convergence.

However, not all VPN solutions can handle voice, video and data applications
simultaneously without significantly compromising the quality of service and
impacting network speed and data loss. Sprint Canadas Cisco-powered IP VPN
solution makes it possible to preserve quality of service and to support voice
and other delay-sensitive IP traffic.

This designation enhances our ability to provide end-to-end solutions to
business enterprises of all sizes in Canada and in North America through our
partner, Sprint, added McEwan. We will continue to invest in the development
of our infrastructure to ensure that it remains one of the most advanced IP
networks in Canada.

Sprint Canada has one of Canadas largest national native IP networks, reaching
an addressable market of 90 per cent of Canadas businesses. Sprint Canadas
participation in the Cisco Powered Network program demonstrates its commitment
to provide industry-leading services based on Cisco solutions. As a Cisco
Powered Network service provider, Sprint Canada will benefit from joint
marketing and technology sharing activities with Cisco.

About Sprint Canada Inc.

Sprint Canada is a wholly owned subsidiary of Call-Net Enterprises Inc. a
leading Canadian integrated communications solutions provider of local and long
distance voice services as well as data, networking solutions and online
services. Sprint Canada and Call-Net Enterprises are headquartered in Toronto,
owns and operate an extensive national fibre network and have over 134
co-locations in nine Canadian metropolitan markets. For more information, visit
the Companys web sites at www.sprint.ca and www.callnet.ca.





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Note for Investors:

This news release may include statements about expected future events and/or
financial results that are forward-looking in nature and subject to risks and
uncertainties. For those statements, we claim the protection of the safe
harbour for forward-looking statements provisions contained in the Private
Securities Litigation Reform Act of 1995. The company cautions that actual
performance will be affected by a number of factors, many of which are beyond
its control. Future events and results may vary substantially from what the
company currently foresees. Discussion of the various factors that may affect
future results is contained in the companys recent filings with the Securities
and Exchange Commission, the Ontario Securities Commission and SEDAR.

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|For further information                                                                        |  |                                                                                                          
|Media contact:
Karen OLeary
Corporate Communications
(416) 718-6445
koleary.sprint-canada.com |  | Investor Relations contact:
Farzana Giga
Investor Relations
(416) 718-6251
farzana.giga@sprint-canada.com