TalkTalk has promised to cut the price of its fibre broadband deals should Ofcom force BT to lower its wholesale network access costs.
The broadband provider - which has previously accused BT of developing a fibre broadband monopoly by over-charging wholesale customers - is waiting on the outcome of the communications regulator's consultation on pricing.
As reported by the Financial Times, TalkTalk currently pays BT around £8 per month per fibre connection - twice as much as it feels it should.
Dido Harding, Chief Executive at TalkTalk, said high prices are dissuading many UK consumers from upgrading from copper to fibre services.
“Not enough people take fast broadband. BT is charging double what it should,” she said.
"We pledge to pass on any price cuts to customers to expand fibre."
However, BT has hit back at TalkTalk, rejecting the firm's claims over wholesale network pricing.
A spokesman for the former national telecoms operator said TalkTalk is after "a free ride" when it comes to fibre.
"BT’s wholesale fibre prices are among the lowest in Europe and TalkTalk has benefited from those to make a profit from fibre," he stated.
"The UK would be much better served if TalkTalk invested themselves rather than playing regulatory games to try and keep the UK stuck in the copper slow lane."
BT passed an initial margin test earlier in 2014, however Ofcom said the operator's pricing was "close to the boundary" of being anti-competitive.
Ms Harding said, as things stand, BT has the option of raising retail prices for fibre broadband, rather than cutting them.
"BT may need to charge for football or bring down the price of fibre," she told the news provider.
"It is important to the future of the UK to reduce fibre costs."