CoSine Communications Awarded Multi-Million Dollar Purchase Order from BroadBand Office for its IP Service Delivery Platform.

Business Editors/High-Tech Writers

REDWOOD CITY, Calif.--(BUSINESS WIRE)--May 2, 2000

Innovative Provider of Network-based Applications Uses CoSine's

Solution to Offer Full Range of Value-Added IP Services

to Businesses Nationwide

CoSine Communications, which develops, markets, and sells the first open architecture platform designed to rapidly enable the delivery of applications and services from within a Business IP Service Provider's network, announced today that BroadBand Office, Inc., has signed a multi-million-dollar purchase order for CoSine's IP Service Delivery Platform. A leading global provider of network-based communications, Internet and e-business solutions, BroadBand Office has chosen CoSine's IP Service Delivery Platforms to deliver a myriad of high-value, managed service solutions to its enterprise customers, including virtual private networks (VPNs), managed firewalls, and dial tunnel termination for remote access users.

BroadBand Office's core business is to enable business customers within its network footprint to simply plug into a BroadBand Office wall jack and immediately provide access to a full range of cutting-edge communications/Internet services and E-business solutions. Launched in 1999 by a premier venture capital firm and eight of the country's largest real estate companies, BroadBand Office is in operation in 19 metropolitan areas nationwide, and its footprint extends to nearly 20 percent of all commercial office space in the U.S.

"As a single provider of communications services, CoSine's platform enables us to offer a range of value-added IP services to our enterprise customers as well as to our remote access users," said Johnson Agogbua, founder and vice president of engineering at BroadBand Office. "The platform nature of CoSine's solution will enable us to immediately target new service revenue opportunities."

"We share Broadband Office's vision that high-speed Internet access alone is not enough to retain and attract today's savvy business customers," said Dean Hamilton, president and CEO of CoSine. "This partnership allows Broadband Office to layer high-value services over its access technology while providing the company with the strategic platform needed to grow its customer base and secure its position as a single provider of all data services."

The CoSine platform includes the IPSX 9000(TM) non-stop IP service processing switch, a carrier-class switch that marries scalable computing hardware with an open software architecture, the InVision(TM) Service Management System (SMS) and the InGage(TM) Customer Network Management (CNM) system. This platform enables Service Providers to create, manage and deliver value-added IP services to enterprise customers, who, in turn, can monitor and control their portion of the public IP network.

Today, CoSine's market-leading suite of managed, network-based IP services includes the Network Associates Gauntlet Firewall, site-to-site IPSec tunneling (virtual leased line), IPSec dial tunnel termination, virtual routing with support for the Border Gateway Protocol (BGP4), Open Shortest Path First (OSPF) and Routing Information Protocol (RIP), DSL aggregation, Frame Relay to IPSec interworking, IP-Enabled Frame Relay and Frame Relay over IPSec.

About CoSine Communications

Founded in 1998 and based in Redwood City, Calif., CoSine Communications develops, markets and sells the first open architecture platform designed to rapidly enable the delivery of applications and services from within a Business IP Service Provider's network. The CoSine solution enables Next Gen Telcos, Competitive IXCs, International Service Providers and PTTs to quickly and reliably turn up value-added services to their wholesale and retail subscribers. For more information about CoSine Communications, visit the company's Web site at www.cosinecom.com or contact Suzanne Panoplos at 877-4COSINE.