- Absolute Communications
 - Offers telecommunications equipment and installation, maintenance, and repair services. - ADC Telecommunications
- Provider of network equipment, software, and systems integration services.
- Aero-Tech Communications, Inc.
- Buys, sells, repairs, and refurbishes telephone equipment and sells accessories.
- AG Communication Systems
- Offers service providers network-based products.
- Agility Communications
- Products support the backbone of the dense-wavelength-division-multiplexed (DWDM) fibre optic networks with tunable lasers, transceivers, and wavelength converters.
- Andrew Corporation
- Multinational supplier of communication products and systems to worldwide commercial, industrial, governmental, and military customers.
 Andrews & Arnold Orange Mobile Phones
- Sells telecommunications equipment, specialising in ISDN.- Appian Communications
- Provides optical networking technologies to enable Ethernet services.
- Artesyn Commmunications Products Group
- Provides core communications technology to telecommunications equipment suppliers, including subsystems and scalable boards. Formerly known as the Computer Products Heurikon Division.
- ASC
- Worldwide distributor of language laboratory, multimedia, and voice recording/logging systems.
- Aston Telex
- Offers a range of stand alone and PC based telex machines, as well as telephone systems, from central control units to single cards.
- Astral Point Communications, Inc
- Provides carrier-class intelligent optical networking products.
- Avanex
- Offers a broad range of integrated photonic subsystems, integrated optical modules, and passive optical components to improve the speed and capacity of fibre optic transmission networks.
- Bar Tech Telecom Services (BTTS)
- Provides Norstar, Nortel, and Meridian call centres, telephone systems, headsets, conferencing, and other compatible equipment.
- BinOptics Corporation
- Designer and manufacturer of optical devices based on semiconductor technology.
- Bookham Technology (1)
- BT Business Information Systems
- On-site communications equipment and services for all sized businesses.
- CableTalk Systems Inc.
- Hardware supplier specialising in the physical cable management aspect of a network installation. Also supplier of hubs, routers, switches, and more.
- Calient Networks
- Developers of all-photonic switching systems and software.
- Carrier Access Corporation (1)
- Charter Telecom Inc.
- Supplies Nortel telecommunications and network systems to western Canada.
- Chrystal Networks, Inc.
- Buy, sell, and trade excess telecom equipment.
- Command Communications
- Makers of line sharing devices, mobile phone antennas, on-premise paging systems and more.
- CopyTele, Inc (1)
- Craig Communications
- Specialising in business phone systems and equipment. Also buys and sells new and refurbished telephone equipment.
- Dataprobe
- Manufactures products for remote site management.
- Dedicated Business Systems, Inc.
- Authorised reseller and installer of Avaya telecommunications equipment.
- Delta Energy Systems
- Develops, manufactures, and markets customised power supplies, telecom power systems, and board mountable DC/DC converters for telecommunications, information technology (IT), network technology, and office communications.
- Direct Communication Radio Services (DCRS)
- Dealers for manufacturers including Motorola and Dolphin.
- Diversified Networks
- Provider of integrated communications product and services including unified applications, converged networks, data networking, and installation services.
- EPC Services UK Ltd
- Provides advanced telecommunications and IT consultancy and project management. Also installs business telephone systems, videoconferencing, and voice PBX.
- Ericsson
- International manufacturer of advanced systems and products for wired and mobile communications in public and private networks.
- Etrali
- Integrator for the financial community, including telephony products, trading systems, dealerboards, and extranet services.
- Frontrunner Network Systems
- Offers voice, video, and data equipment.
- Fujitsu Limited@
- Collection of regional and subsidiary sites for Fujitsu Limited, a provider of information technology and communications equipment and software.
 Hickey Communications Ltd
- Suppliers of mobile phones, two way radios, and pagers.- Hitachi Telecom
- Produces PBX products and services, dealerboard products, ATM and SONET equipment, and network management solutions.
- HP Carrier-Grade Servers
- Offers carrier-grade servers for businesses to deploy telecommunications products and services.
- i-conX solutions
- Specialises in Interconnect Billing and Reconciliation products and services for fixed, mobile, and IP telecom operators.
- Independent Technologies, Inc.
- Offers telecommunications equipment including caller ID boxes. Also designs call management software, handsets, locks, and more.
- Infinit Technology Solutions
- Offering new and used data networking and telecommunications solutions. Infinit sells routers, switches, servers, and training solutions.
- IP Communications
- Experts in Panasonic IP-PBX and low voltage masters of IP communications and data networks.
- Kotura
- Develops silicon integrated opto-electronic integrated circuit (SOEIC) components and multi-function module-level products.
- Lucent Technologies
- Designs, develops, and manufactures telecommunications systems, software, and products.
- Lucent Technologies Ireland
- Luminent
- Specialises in single-mode fibre optic components and subsystems for high-capacity, long-reach data transmission.
- LuxN
- Optical networking access solutions for local service providers to extend managed optical networks from metropolitan points of presence to enterprise sites.
- Marconi
- Global telecommunications equipment and services company providing optical networks, broadband routing and switching, and broadband access technologies and services.
- Microtel International
- Designs, manufactures, assembles, and distributes transmission and network access products and telecommunications field and central office test instruments.
- Mitel Networks Corporation
- Provider of integrated communications solutions that focus on blending technology with the human interface.
- Nave Communications Co.
- Provides auctions and sales of telecommunications equipment.
- Netbricks
- Develops, manufactures, and supplies telecommunication technologies to computer and communications equipment manufacturers.
- New Era Telecommunications
- Offers telephone and voice mail systems, computer and IP telephony, and wireless communications in Connecticut and western Massachusetts.
- Nokia Siemens Networks
- Major provider of communications services. Find details for the global operations of Nokia Siemens Networks and a complete portfolio of mobile and fixed network infrastructure solutions.
- Off Air Electronics
- Major supplier of telecommunications equipment.
- Pavelcomm
- Service-oriented company offering a range of support for voice and data communications.
- Peco II
- Provides engineering and on-site installation services and designs, manufactures, and markets communications power systems and power distribution equipment.
- Photon, Inc.
- Manufactures laser beam profilers that measure and analyze spatial irradiance using scanning slits, CCD arrays, and goniometric technologies, for sources from UV to FIR.
- Platforms Wireless International
- Developers of a system for putting communications antennas on tethered balloons, providing services to areas where ground antennas are not practical.
- Portsmouth Communications
- Supplies and installs new and used business telephone systems. Also provides cabling, electrical, and PC installation services.
- Praxtel Telecommunications
- Distributor of fibre optic path cords, connectors, enclosures, distribution frames, coaxial and RF cable and connectors.
- PRP Telecom
- PRP Telecom provides business phone systems and communications solutions to companies throughout the U.K. Includes VOIP solutions, structured cabling, and business headsets.
- Quantum Bridge Communications
- Offering optical access networking equipment designed to address bandwidth bottlenecks.
- Racal Translink
- Provide advanced and specialised telecommunications solutions with emphasis on the transportation market.
- RADirect
- Sells datacom products, telecom equipment, CSU/DSU, fibre and short range modems, inverse and fibre multiplexers, and more.
- Shanghai Communications Technologies Center (SCom)
- Specialises in research and development of digital communications products.
- ShenZhen KaiFa Technology Co., Ltd.
- Supplier of energy meters, smartcards, automation equipment, dispensers, and image processing.
- Somera Communications
- Offers telecommunications and network solutions for configuring, engineering, and deploying wireless, wireline, and data networking equipment.
- SoTel Systems
- Supplier of name brand communications equipment and business telephone systems. SoTel Systems resells brands including Nortel, Avaya, Polycom, Aastra, Plantronics, Cisco, and more.
- Specialized Products Company
- Supplies service and telecom professionals with fibre optics, tools and tool kits, cases, test equipment and electronics, multimeters, and oscilloscopes.
- Surplus Communications
- New, used, and refurbished wireless and telecommunications infrastructure equipment from major manufacturers.
- Technical Concepts Corp
- Specialises in complete solutions, support & equipment for LAN and WAN networks.
- Telecommunications, Phones, Fax, and Headsets Directory
- Lists suppliers of business telecommunications equipment, fax machines, BT office phone systems, Siemens phones, and Bluetooth phone headsets.
- Teleks Telecom
- Offers new and used Dialogic boards for sale.
- Telephone Magic
- Offers new and refurbished telephone equipment, including phone systems, voice mail, wireless phones, and headsets by Meridian Norstar, Panasonic, NEC, and Avaya.
- Teleswitch
- Offers business telecommunications solutions, products, sales, service, and installation.
- Teletech Plus
- Source for autodialers, predictive dialers, PBX phone systems, call centres, and automated reminder programme.
- Time Motion Tools
- Offers electronic field service tools and tool kits.
- Tradecom
- Specialises in Siemens trading equipment and Datavoice voicelogger systems.
- United Telecom, LLC
- Provides business telephone and voice mail systems as well as networking equipment.
- Visual Contact
- Offers videoconferencing, video phone products, and consulting services.
- Vitel Communications
- Provider of electronic business communications systems, based in Amarillo, Texas. Vitel specialises in telecommunications solutions, alarms, cabling, and many other business communications systems.
- White Rock Networks
- Provider of optical transport, multi-service access, and IP aggregation products enabling low-cost, carrier-class ethernet and TDM service delivery.
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