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• BOTW UK Directory: Business: Business to Business: Telecommunications 

• Cavalier  - High speed internet and telephone provider. Provides an overview of the DSL telecommunications carrier and information on the services offered.
• CITEL  - Inter-American Telecommunication Commission endeavors to make telecommunications a catalyst for the dynamic development of the Americas.
• FluentStream Technologies  - Offers Virtual Hosted PBX for small to medium sized businesses with no on-site equipment to maintain and plug in talk phones.
• Greg's Cable Map  - Offers a graphical representation of the data cables that criss cross the globe, as well as allows users to view cables from one destination to another. Includes reports of cable outages.
• National Telecommunications and Information Administration (NTIA)  - An agency of the U.S. Department of Commerce acting as the principal voice on domestic and international telecommunications and information technology issues.
• Nokia Siemens Networks  - Offers communications services with global operations and a complete portfolio of mobile and fixed network infrastructure solutions.
• NTT Communications: Data Center Services  - Offers telecommunication and network services for businesses worldwide.
• RTTE  - Radio and Telecommunications terminal equipment directive. The main route to compliance for Radio and Telecom equipment that is sold in Europe.
• Telephone Installers  - Find a telephone installer or phone technician in your area.