Va. Code § 56-479
The Commission shall keep itself fully informed of the condition of all the telephone companies of this Commonwealth as to the manner in which they are operated with reference to the accommodation of the public and shall, from time to time, make and enforce such requirements, rules and regulations as in its judgment will promote the efficiency of the service to be rendered, and to that end may require physical connection to be made between two or more lines at such place and in such manner as in its judgment the public service requires, having due regard to the interest of the companies to be affected thereby, as well as the effect upon their ability to render the best service to the public. The Commission may inspect and regulate the character of lines, buildings and other equipment used in the reception and transmission of messages, and may prohibit the paralleling of the lines of one company by those of another if in its judgment the efficiency of the service by either company or the public convenience will be injuriously affected.
Va. Code § 56-479