(a) In this section, “multiple–line telephone system” means a system that:
(1) consists of common control units, telephone sets, control hardware and software, and adjunct systems, including network and premises–based systems; and
(2) is designed to aggregate more than one incoming voice communication channel for use by more than one telephone.
(b) (1) Except as provided in paragraph (2) of this subsection, on or before December 31, 2017, a person that installs or operates a multiple–line telephone system shall ensure that the system is connected to the public switched telephone network in such a way that when an individual using the system dials 9–1–1, the call connects to the public safety answering point without requiring the user to dial any other number or set of numbers.
(2) A unit of the Executive Branch of State government shall comply with paragraph (1) of this subsection on the date that the multiple–line telephone system of the unit is next upgraded.