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Callahan Associates International - Develop and operate integrated broadband communications networks and wireless networks. Securing the capital backing to develop and operate a competitive business.

Cartesian Limited - Providing network, OSS, and billing systems integration and revenue assurance solutions.

Catalyst Limited - Telecommunications consulting and resourcing worldwide.

Centennial Telephone - Provide analysis of client's Voice, Data, and Internet needs. Research current and future technologies and present options to client. Configuration and engineering of design. Provide RFI, RFP and RFQ documentation.

ChaseWaterford - Provides a range of management consultancy services aimed at assisting telephone companies reduce exposure to fraud and security failure.

Chetan Sharma Consulting - Specializes in Wireless data applications, business strategy, technology implementation, Voice application and Voice User Interface (VUI) development.

Clere Communications - Offers end-to-end project management and administrative service and has experience in wired Internet connectivity.

COMMfusion - Marketing research and consulting on voice and data convergence.

commNOW - Consultancy and publisher of market research reports for the wireless, cable and satellite, and competitive telephony industries.

Communication Sciences - Provide insights and recommendations - from premises systems to multimedia networks, call centers to trading rooms.

Communications Advanced Technologies, Inc. - Telecommunications firm providing logistical, consulting and call center services. Professional expertice in value added solutions, business development mission-critical support and products.

Communications Center - Consulting services and specialized reports for the satellite communications industry.

Communications Technology Consulting - An independent communication technology consulting firm specializing in assisting organization in turning Technology into a competitive edge.

CompuCom Systems, Inc. - Provides distributed desktop products and network integration services to fortune 1000 customers, including lan/wan projects, consulting and asset tracking, network management, help-desk and field engineering, procurement, configuration, distribution and software management. (Nasdaq: CMPC).

Comsil - Hong Kong based, specializes in providing technical and commercial services from network planning, engineering and optimisation to commercial strategy advisory.

Consulting Stream - Focus on the key areas of strategic telecommunications which affect large national and international enterprises.

Convergence Communications - Specializes in emerging technologies including voice over IP, broadband Internet and 3G wireless service for medium and large businesses.

CostQuest Associates - Designs and Develops Systems and Services to Assist in the Understanding of Network Deployment Costs and Practices.

CT Labs Testing Services - A full service testing and product analysis lab specializing in automated testing and exclusively serving the computer telephony industry.

Custom Networks, Inc. - Provides consulting, design, sales, and installation for voice, data, and cabling systems.