Removing restrictions on the services provided by Chorus would risk distorting competition in the telecommunications market, a parliamentary committee says.
In its report on the Telecommunications (New Regulatory Framework) Amendment Bill, the Economic Development, Science and Innovation Select Committee recommended retaining some restrictions on Chorus, which owns most of the country's fibre network.
Line-of-business restrictions are the provisions in the Telecommunications Act that limit the kind of activities that Chorus can be involved in.
The main restriction in the Act is a prohibition on Chorus' involvement in retail activities.
The bill as it stands would retain that restriction but would remove restrictions on Chorus providing more sophisticated wholesale services and linking its wholesale services together to provide something resembling a retail product, the report said.
"We note that the policy rationale for relaxing the restrictions is to encourage innovation. On balance, however, we consider that the potential benefits in terms of innovation and efficiency are outweighed by potential disadvantages from changing Chorus' commercial incentives.