The country's biggest telco, Spark, opposed the December draft by promoting submissions from internet users in the "Be Counted" campaign.
As a result there were 52,000 submissions and it will be clear today whether they have had the effect of bringing down prices.
"[Today] is an important day in the development of New Zealand's internet," said Spark general manager corporate relations, Andrew Pirie.
Spark estimated the commission's previously proposed wholesale line charges for accessing Chorus' network would cost internet and landline customers at least $500 million during the next five years.
It said more than 90 per cent of New Zealanders still relied on copper for their broadband or landline connection, and about half of monthly bills went to Chorus for access to its lines network.
The commission is independent but telcos have questioned what role the Government had played in past decisions, which protected the interests of dominant wholesale company Chorus and its key role within the telecommunications sector.