Sonus Networks Adds 18 Companies To Open Services Partner Alliance

Initiative Attracts More Than 130 Vendors in Two-Year History of Alliance

WESTFORD, Mass., May 15, 2001 – Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, today announced it has increased membership in the Open Services Partner Alliance(R) (OSPA) by 18 companies, further expanding the spectrum of network solutions available to the carrier market. Sonus has added the following telecom vendors to the Alliance: aTelo, Empirix, Gallery IP Telephony, Indigo Software, Infozech Software, iSoftel, MesssageMachines, NetNumber, Occam Networks, QuesCom, RADCOM, Strata Group, TeleSynthesis, TGF Linux Communications, TransNexus, UltraDNS, Verascape and Webley Systems.

"As we complete the second year of the partner program, we are thrilled with how our Alliance has sparked so much interest in the telecom industry," said Terri Griffin, vice president of marketing programs, Sonus Networks. "The 18 vendors joining the OSPA today illustrate the extent to which the program has attracted top companies that want to work with Sonus in promoting packet voice technology. Along with our partners, we are focused on helping carriers provide next generation services to end users."

Companies that have recently joined the OSPA represent a diverse set of enhanced services, network infrastructure products and services:

  • aTelo offers a software-based media server and other products that enable service providers to quickly and cost-effectively offer enhanced voice, data and video services to their customers. The company's products are designed to interface natively with Session Initiation Protocol (SIP) based networks and leverage high-density media gateways and softswitches to interface with the PSTN. (www.atelo.com)   
  • Empirix develops innovative testing and monitoring products for business-critical voice, data and Web applications. Its portfolio of software, hardware and service solutions ensures that next generation networks and e-business systems deliver the highest possible quality of experience (QoE) to customers and business partners. The Empirix product portfolio includes industry leading test solutions for generating real world, multi-media traffic, verifying and analyzing voice-quality, emulating IP networks, and ensuring web-site performance. (www.empirix.com)   
  • Gallery IP Telephony offers the CAssiopeia Softswitch, an alternative to the Class 5 switch that is easily integrated into current and future network environments. It incorporates all of the reliability, flexibility and scalability features necessary for delivering profitable telephony services as well as providing a complete set of business and residential class services for the end user. The CAssiopeia Softswitch gives service providers the means to quickly reap the many benefits of supplying both IP telephony and IP centrex to their marketplaces at the lowest costs and in the shortest possible time. (www.g-ipt.com)   
  • Indigo Software, an Internet-infrastructure company, provides a full suite of SIP-based software and development tools to meet the exacting communications industry requirements of reliability, scalability and performance, allowing service providers to transform the end user experience of integrated communications. (www.indigosw.com)   
  • Infozech Software Inc. is a next generation telecommunications solution provider for Customer Care and Billing (eBiLL) and Inter-Carrier Account Settlement (ICAS). eBiLL is web enabled and provides Internet access for customer self-care and customer service representatives, including significant new functionality for multi-services – voice, data and content - based convergent billing. ICAS enables long distance carriers and resellers to rationalize termination settlement costs with accuracy. eBiLL and ICAS software applications are targeted at Internet telephony, local, long distance and Internet service providers to make dramatic improvements in their business processes and new product offerings. (www.infozech.com)   
  • iSoftel develops telecommunications software platforms and provides integrated solutions combining voice switching and call management functions. Its principal voice switching and call management solution is the ipMillenia Prepaid/Postpaid Management System (PPMS). ipMillenia PPMS is a feature-rich, scalable solution that enables service providers to deploy several classes of services with a focus on value chain and workflow management. (www.isoftel.com)   
  • MessageMachines develops advanced softswitch applications and services that integrate all types of real-time communication devices and systems, such as cell phones, pagers, PDAs, wireless application protocol (WAP) applications, short messaging system (SMS) messages, e-mail and instant messaging. The MessageMachines Carrier Server is a highly scalable, carrier-class development and deployment server that enables fast, intelligent routing of text messages. (www.messagemachines.com)   
  • NetNumber provides secure, reliable, ENUM-compliant directory services and support systems to the Internet telephony industry. The NetNumber ENUM Service provides cross-domain service discovery of unknown IP application endpoints through use of a standard phone number. This discovery capability enables practical, global deployment of end-to-end IP-based communication services, while simplifying the complex task of cross-domain provisioning and configuration. (www.netnumber.com)   
  • Occam Networks provides cost-effective, scalable broadband deployment solutions that integrate the functionality of a digital loop carrier, DSL access multiplexer, and media gateway into a single flexible, scalable platform. The Occam Broadband Loop Carrier cost-effectively delivers lifeline POTS and a variety of broadband services including ADSL, G.SHDSL (Global.standard High-Bit-Rate Digital Subscriber Line), and Gigabit Ethernet, to residential and business customers from a single, converged voice and data access network. (www.occamnetworks.com)   
  • QuesCom offers a family of next-generation telecommunications solutions based on IP technology. QuesCom's SmartIAD(TM) is a unique access device that combines voice and data to deliver services to enterprise customers and service providers. The SmartIAD, complemented by the NextBX Software and Applications, supports IP telephony devices and offers integrated IP routing and backbone connectivity over DSL, IP, frame relay, ATM and ISDN. (www.quescom.com)   
  • RADCOM provides leading quality management and performance measurement solutions. The company's Omni-Q(TM) is a distributed, fully managed system that enables IP telephony service providers to measure, manage and control voice quality on their production networks by providing real-time, end-to-end voice and signaling quality information. The company also offers the VoIP Performer(TM), a pre-deployment solution that simulates real world network stress levels and then measures the performance of devices/applications under test. (www.radcom-inc.com)
  • Strata Group, Inc. is a provider of intuitive OSS solutions for the management of next-generation and traditional heterogeneous networks. Strata Group's C3C(TM) software solution manages many types of network elements and provides the user with provisioning, usage collection and performance reporting. (www.stratagroup.com)   
  • TeleSynthesis is a software engineering services firm that performs projects encompassing the full lifecycle of software development from the definition of business requirements through the stages of design, development and support. For example, the company develops SS7-based and IP-based enhanced services for next generation networks. The TeleSynthesis Enhanced Services Platform (ESP) for voice services includes SIP-based local number portability compliance, SIP-to-TCAP translation services and Class 5 features. (www.telesynthesis.com)   
  • TGF Linux Communications develops and manufactures customer premises communications products such as Linux-based unified messaging servers, softphones and VoIP media hubs. The company's V-Gate product is the first Linux-based communications server with speech driven unified messaging, web and mail servers, and LAN/WAN IP telephony features. (www.tgflinux.com)   
  • TransNexus provides secure IP interconnect software solutions, which are designed to operate in multi-vendor network environments. TransNexus products are predicated on the open settlement protocol (OSP), a client-server protocol that enables secure authorization, routing and billing for any type of IP communications session that can be metered and billed. The OSP Nexus(TM) Server is a commercial enabler for inter-domain AAA functionality (authentication, authorization, and accounting) required for remuneration of carriers securely exchanging IP communications. (www.transnexus.com)
  • UltraDNS Corporation is the leading directory infrastructure services provider (DISP). The company delivers solutions that enhance the reliability and performance of the world's largest directories and the mission-critical applications that access them. The Managed DNS Service offering is the only fully integrated domain name system (DNS) service that significantly enhances the reliability and performance of mission-critical web applications. (www.ultradns.com)   
  • Verascape provides voice system products that link the converging Internet and telecommunications industries. The Vivance(TM) architecture, on which all Verascape products are based, delivers systems that are scalable to carrier-grade capacity and are based on important industry standards such as VoiceXML, SIP and IP. Verascape offers a media gateway, call director, text-to-speech server and speech server. (www.verascape.com)
  • Webley Systems develops, hosts, and markets advanced communications services and is the leader in providing natural language voice dial-tone applications for both PSTN and SIP-enabled IP networks. Webley's hosting platform provides unified communications, personal assistant and corporate attendant services, virtual PBXs, conferencing services, and other network-resident communications services for carriers, enterprises and small to mid-size businesses. (www.webley.com)

About Sonus' OSPA

Founded on the combination of Sonus' Open Services Partner Alliance (OSPA) Program and the INIP PoweredSM Partner Program from the acquisition of telecom technologies, inc., the OSPA has gained significant industry momentum, with membership of more than 130 leading independent vendors. The OSPA provides a framework that offers service providers end-to-end packet-based network solutions using best-of breed technologies and applications. The goal of the OSPA is to empower standards-based interoperability between applications, hardware vendors, and the Sonus product suite. An integral part of the Sonus OSPA, the Interoperability Laboratory is the first in the industry where product interoperability is verified, trial testing is performed, and complete solutions are ultimately produced. Additional information on the OSPA is available at http://ospa.sonusnet.com.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice infrastructure products for the new public network. Sonus' solutions enable service providers to deploy an integrated network capable of carrying both voice and data traffic, and to deliver a range of innovative, new services. The Sonus Open Services ArchitectureTM (OSA) and award-winning Packet Telephony suite cut the time-to-market for competitive new service products, allowing carriers and third-party developers to expand marketshare and build important new revenue streams. Its highly scalable products fully interoperate with and extend the life and utility of today's public network. Sonus embodies in its management and staff decades of experience in developing carrier-class voice, data and multimedia solutions for implementation in the world's largest networks. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

This release may contain projections or other forward-looking statements regarding future events or the future financial performance of Sonus that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. Readers are referred to Sonus' Annual Report on Form 10-K, dated March 28, 2001, filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. These risk factors include, among others, the Company's ability to grow its customer base, dependence on new product offerings, market acceptance of its products, rapid technological and market change, integration risks relating to the acquisition of telecom technologies and manufacturing and sourcing risks.

Open Services Partner Alliance and Open Services Architecture are trademarks of Sonus Networks. INtelligentIP is a registered trademark of Sonus Networks. INIP Powered is a service mark of Sonus Networks. All other company and product names may be trademarks of the respective companies with which they are associated.

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