Michigan Compiled Laws, Chapter 484. Telephone, Telegraph and Radio § 484.1202

Sec. 202. A public agency which is excluded from a 9-1-1 service district in a 9-1-1 system implemented under this act, but which is operating an existing emergency 9-1-1 service at the time the 9-1-1 system is implemented, shall permit any technical modifications to its existing system which are necessary for compatibility with the 9-1-1 system. Any cost of the service supplier associated with such modifications shall be collected from service users in the 9-1-1 service district.