Convergence Communications
- Specializes in emerging technologies including voice over IP, broadband Internet and 3G wireless service for medium and large businesses.
- http://www.convergence-comm.com/

Clere Communications
- Offers end-to-end project management and administrative service and has experience in wired Internet connectivity.
- http://www.clerecomm.com/

Cartesian Limited
- Providing network, OSS, and billing systems integration and revenue assurance solutions.
- http://www.cartesian.co.uk/

Custom Networks, Inc.
- Provides consulting, design, sales, and installation for voice, data, and cabling systems.
- http://www.customnetworks.com/

commNOW
- Consultancy and publisher of market research reports for the wireless, cable and satellite, and competitive telephony industries.
- http://www.commnow.com/

Communications Center
- Consulting services and specialized reports for the satellite communications industry.
- http://www.communications-center.com/ccreports.htm

COMMfusion
- Marketing research and consulting on voice and data convergence.
- http://www.commfusion.com/

Communications Technology Consulting
- An independent communication technology consulting firm specializing in assisting organization in turning Technology into a competitive edge.
- http://www.technologyplus.com/

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

CT Labs Testing Services
- A full service testing and product analysis lab specializing in automated testing and exclusively serving the computer telephony industry.
- http://www.ct-labs.com/

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.
- http://www.centennialtelephone.com/

Communication Sciences
- Provide insights and recommendations - from premises systems to multimedia networks, call centers to trading rooms.
- http://www.comsci.com/

ComPro Consulting
- Specializing in project management for companies engaged in the OSMINE process with Telcordia, to ensure requirements are being met for equipment, software and reporting to Regional Bell Operating Companies (RBOCS).
- http://comproconsulting.com/