Retail telcos use Telstra's infrastructure to provide retail voice and broadband services.
The six regulated, or declared, services are the unconditioned local loop service, line sharing service, wholesale line rental, local carriage service and fixed originating and terminating access services.
“The NBN rollout is progressing but the fixed line network remains relevant to millions of consumers, before they migrate to the NBN, and in NBN fixed wireless and satellite areas where legacy network services will remain available,” ACCC chair Rod Sims said on Monday.
"This will encourage competition in the retail market and deliver greater choices for end-users in the form of better prices, service quality and service options."
If a service is declared, then a network owner has to provide access upon request. When commercial deals cannot be struck, the ACCC's regulated price and non-price terms will apply.
“In making this decision, the ACCC considered submissions and found a general consensus in favour of our approach,” Sims said.
There will now be another inquiry to determine access terms and pricing that would apply to the six fixed line and wholesale ADSL services. These terms will published in June 2019.