- AIRCOM International
- Provides telecoms training and consultancy services worldwide. - Alten Ltd
- Technical consulancy for systems and software. Provides engineers who form an integral part of the client's team. - Analysys@
- ARC Group
- Provides information and consultancy services in the areas of future technology and market developments worldwide in the communications industry. - Auditel UK
- Offers cost management consultancy for communications and utilities expenses. - Bit Tech Limited
- Specialising in SS7/C7 training, testing, and consulting. - DataKinetics
- Provides SS7 connectivity solutions, typically for Intelligent Network and mobile/wireless/GSM applications. - EPC Services UK Ltd
- Provides advanced telecommunications and IT consultancy and project management. Also installs business telephone systems, videoconferencing, and voice PBX. - Evocal
- Offers a range of communication and technology services. - Independent Telecom Consultants
- Offers telecom solutions to corporates with high call spends, offers least cost routing, 0800, 0845, and 0870 products. - Intelligent Comms
- Providers of telecom expense management, benchmarking, asset management, bill management, VoIP, and consultancy services. - InterConnect Communications Ltd
- Specialising in telecommunications regulations, interconnection, and certification. - International Telesis Group
- International Telecommunications Consultancy in London. - Juniper Research
- Industry analysts and publishers of market and technology research reports, covering broadband, wireless LAN, mobile, Internet, and fixed telecoms. - Maple Communications Management
- Independent telecommunications consultancy providing support for its customers. - Marine Environmental
- Specialises in installation and maintenance of international, national, and inland cables. - Mason Communications
- Provides telecoms/IT convergence consulting services including strategy/business planning, design/engineering, programme/project management, procurement/outsourcing and network optimisation. - Mason Information Technologies
- Provides advice, service, and training on all aspects of telecommunications and information technology. - Mediation Technology
- Offers digital media technology and third generation mobile consultancy. Includes monthly column and community activity information. - Outburst
- Providing voice, data, and mobile consulting. - Ovum (2)
- Peter Dudley Network Consulting
- Specialises in large enterprise network strategy and network outsourcing. - Quotient Communications Ltd
 - Schema
- Offering business strategy, marketing and technical advice to telecommunications operators, equipment suppliers and regulatory bodies. - Smith Bellerby
- Cost management consultants offering cost reduction services, including audits, for utilities and fixed or mobile telecommunications. - Switch-IT Limited
- Specialising in benchmarking and delivering cost savings without supplier change or network upheaval. Experts on major U.K. and Eire telcommunications suppliers. - Tarifica Telecoms Tariff Consultancy
- Providing tariff information, analysis and consultancy services. - Telecom Global
- Telecom services consultancy offering 0845, 0870, and premium rate number services. - Telutions Ltd
- Custom solutions for the telecoms industry, offering consultancy, and the design and development of bespoke platforms and applications. - Touchwood Telecommunications
- Offers technical design, structure cabling, facilities management, bill checking, and user training. - VOiCOM
- Convergence/VoIP technical training and consultancy to the communications industry. - Wray Castle
- Specialising in the design, development, and delivery of high level telecom technical training for RF, network, and software engineers. - X-PLOR Telecoms
- Provides a test platform to telecoms operators worldwide which uses autonomous network testers (ANTs) to evaluate network performance and revenue leakage. - X-Tension
- Software and consulting company that has developed Systems Integration and Data Explorer applications. - Your Communications
- Offers business communication services including voice, data, and mobile phone.
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