65-407-293 Me. Code R. § 10
If a CLEC is abandoning all local exchange service or local exchange service to a specific customer class (as described in Sections 7, 8 and 9) , and there is no acquiring local exchange carrier (as described in Section 12) , the abandoning CLEC shall provide E-911 access (access to emergency services through the enhanced 911 system) to any customer who does not select another local exchange carrier prior to the effective date of the abandonment if it is technically possible to provide the service itself or the abandoning CLEC may obtain such service from its underlying or any other carrier. When E-911 access is provided, it shall continue for a period of 21 days after the termination of the remainder of local exchange service.
65-407 C.M.R. ch. 293, § 10