Basic and sophisticated 911 systems are described, and three methods of response are delineated (direct dispatch method, transfer method, and relay method). Such system features as forced disconnect, called party hold, ringback, automatic number and location identification, and dial tone are discussed first. A synopsis of Wisconsin's 911 statute and its implementation time table are included. Central office requirements, network arrangements, terminal equipment, and interconnection arrangements are described to aid utilities personnel in understanding the telecommunication requirements of agencies, and additional information is given on the costs required to implement the telephone utility portion of 911 systems. Community contact procedures to improve public awareness of the 911 system are also outlined. Finally, guidelines are given on evaluating the installed 911 system, restoring service, tracing calls, modifying existing systems, and resolving disagreements among agencies. Generally, the manual recommends that utilities provide prompt service to answer inquiries from agencies concerning 911, participate in the early planning stages, and allow 911 calls at no charge to the calling party. Appendixes present a glossary, the Wisconsin 911 law, a list of existing 911 systems and telephone utilities in the State, and sample forms. Diagrams are included.