Bell and Telus are again clashing over access to each other’s fibre internet networks, according to filings with Canada’s telecom regulator reported by The Globe and Mail.

The fight is about rules that force big telecom companies to share their fibre internet networks. Those rules let competitors, including Bell and Telus, resell internet service to customers. The policy was finalized last summer and has already led to several disputes between the companies.

On January 20, Telus told the CRTC that Bell made it harder for Telus to sign up new customers. Telus said Bell had “drastically degraded” its access to Bell’s network about a week earlier, after warning in December that it might do so. Telus did not explain exactly what Bell changed, because those details were blacked out in the filing.

Telus asked the CRTC to intervene, saying Bell’s conduct “shows that Bell remains determined to harm Telus, and therefore competition and consumers, by any available means regardless of their legality.”