- 3M Telecommunications - products for access and enterprise networks, and optical OEMs.
- Alcatel - provider of communications products and services to carriers, service providers, and enterprises.
- AT&T - provides communications services and products, and network equipment and computer systems to businesses, consumers, telecommunications service providers, and government agencies.
- British Telecommunications - British Telecommunications
- Deutsche Telekom - provides public fixed-network voice telephony, mobile communications, text and data services, corporate networks, and on-line services.
- Motorola - provider of integrated communications and embedded electronic technologies.
- Nortel Networks - supplies communications technology and infrastructure to service providers and enterprise customers.
- SBC Communications - provides a full range of voice, data, networking, and e-business services, including local and long-distance, high-speed Internet access and data transport, and voice and data network integration.
- Verizon Communications - provider of wireline and wireless communications and publisher of print and online directory information.
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