The local loop is actually all the telephone wiring from the access point to the client's hardware. The access point is a box that acts as the boundary for the end of the wiring under the responsability of the company that offer the service. Any problem that arise after this boundary is under the client's responsability and to his own charge.
Because the VoIP service of Vidotron requires a MTA, the boundary must be modified or moved. If possible, the technicians will unplug the wires of the company you used to deal with and plug the MTA's wires in to etsablish a connection with the local loop. In the case of the boundary being too far from the MTA, the technicians can install a new one.