- Telstra Corporation (8)
- Optus (3)
- AAPT
 - Offers a range of voice, mobile, data, and Internet services to businesses, government bodies, and residents throughout Australia. - Ericsson Australia
- PowerTel
- Specialises in voice and data communications and Internet services.
- Strathfield Group
- Mobile phones, car audio and security, computers, and more.
- Primus Telecom Australia
- Offers home and business telephone and Internet services.
- TransACT Communications
- Building and managing an advanced broadband communications network across Canberra and the ACT.
- Card Access Services
- Provides secure online payment applications, credit card transactions, interactive voice response services, 1900 services, and telephony and Internet integration.
- Northland Asset Group
- Media company providing premium rate telecommunications, marketing, advertising, and Internet services to companies around the world.
- Arrow Voice & Data
- Australian telephone company that provides businesses with broadband Internet, ADSL, SHDSL, ISDN, mobile phone rate plans, business phone lines, and BlackBerry solutions.
- Bendigo Community Telco
- Regionally based telecommunication carriage and service provider.
- Telecorp
- Communications focused company offering calling card services, dialup Internet access, long distance calling, teleconferencing, and prepaid mobile to business and residential markets.
- Select-Tel Communications
- Offers management solutions and cost optimisation technology.
- PGS Communications
- Supplies and installs telephone systems. Specialises in PABX and wireless systems.
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