Metallic path facility (MPF) are the unshielded twisted pair of copper wires that run from a main distribution frame (MDF) at a local telephone exchange to the customer.
In this variant, both broadband and voice (baseband) services, together potentially with a video on demand service, are provided to the end user by a single communications provider.
Hence the provision of services over the end users copper wires might be shared between two providers.
In the UK at least, this service is called Wholesale Line Rental (WLR).
Both terms are commonly used, for example by Ofcom and Openreach in the UK, to denote a local-loop unbundling service, designed to ensure a former monopoly player (deemed to have Significant Market Power, or SMP) allows a level playing field or Equivalence of Inputs.