HARTFORD, Conn. (AP) — Advocacy groups and a dominant telecommunications company are fighting over Connecticut legislation that would relax regulations to reflect major shifts from landlines to cellphones and cable phone service.

AT&T, which is regulated by the state, is backing a proposal that would end some regulations it says make it difficult to compete with unregulated cellphone and cable company telephone providers. Among numerous provisions, legislation would reduce auditing requirements and limit some regulatory oversight. Verizon, faulting Connecticut rules as “unnecessary and burdensome requirements,” and other businesses and business advocacy groups also support the legislation.