560 CMR, § 4.04
Beginning July 1, 2009, all new or substantially renovated multi-line telephone systems and multi-line telephone system operators shall provide to end users or subscribers the same level of enhanced 911 service that is provided to other end users or subscribers in the commonwealth. The service shall include, but not be limited to:
For structures or buildings located in the commonwealth, such information shall be transmitted to the appropriate jurisdictional PSAP. A person engaged in owning, managing, configuring or operating a multi-line telephone system that provides outbound dialing capability or access shall configure the system to allow a person initiating a 9-1-1 call on the system to directly access 9-1-1 service by dialing in order the digits 9, 1, and 1 without an additional code, digit, prefix, postfix, or trunk-access code. All non-compliant devices that provide outbound dialing capacity or access must have immediately adjacent to, and optionally on, the device an instructional sticker instructing the user how to access 9-1-1 service. The instructional sticker must be printed in at least 12-point boldface type, in a contrasting color using a font that is easily readable, and is written in English and Spanish.
560 CMR, § 4.04