- Equipment Manufacturers

- Software Vendors

- Applications Developers

- Enabling Technology Vendors

- Testing and Network Assurance Technology Vendors

- Value-Added Resellers

- Dealers and Distributors

- VoIP Service Providers

- Regional Bell Operating Companies

- Independent Telcos

- Public Relations Firms

- Market Research Firms

- Conference and Seminar Producers

- Corporate and Government Enterprise End-Users

- Venture Capital and Investment Firms