- 1-800-Video-On
 - Boulder - Specialising in video communications, multipoint bridging, videoconferencing, multi-point imaging and engineering support. - CellPort Labs, Inc.
- Boulder - Developer, licensor, and manufacturer specialising in wireless universal connectivity technology.
- Earth Tones
- Denver - Owned by nonprofit environmental organisations, with profits going towards grassroots environmental campaigns.
- Genesys Conferencing
- Denver - Offering a multitude of voice, Internet, and video conferencing services as well as event management services.
- Golden Voice
- Golden - Voice mail service for small businesses, individuals, and start-up companies.
- Hi Country Wire & Telephone
- Arvada - Provides PBX, small business and office telephone systems, voice mail, phone service, long distance, Internet access and wireless network solutions.
- Horizon Group Telecommunications
- Denver - National telecommunications consulting firm.
- ICG Communications, Inc
- Denver
- Inovonics
- Boulder - Developer and manufacturer of 900MHz products for wireless voice and data communications.
- Intrado
- Boulder - Provides 911 emergency data management, network transaction, call handling, and notification services.
- iQwired Telecommunications Services
- Denver - Provides telecommunications services for business including high speed Internet, bandwidth test, VoIP, local and long distance phone services, bill audits, and telecom consulting.
- Macrologic, Inc.
- Aurora - Billing and customer support solutions for telecommunications organisations worldwide.
- USA Solutions
- Brighton - Providing electricity and natural gas services to the four corners area of the U.S. Also offers Internet access and other telecommunication services.
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