THE MANUAL PROVIDES GUIDELINES FOR TELEPHONE COMPANY PLANNING COVERING ITS TELECOMMUNICATIONS IN A 911 SYSTEM, INTRACOMPANY COORDINATION, IDENTIFICATION OF BOUNDARY OVERLAPS AND OTHER CENTRAL OFFICE PROBLEMS, AND HANDLING OF EMERGENCY CALLS PRIOR TO ESTABLISHING SERVICE. IT AIDS IN UNDERSTANDING THE TELECOMMUNICATION REQUIREMENTS OF AGENCIES BY DESCRIBING CENTRAL OFFICE REQUIREMENTS, NETWORK ARRANGEMENTS, TERMINAL EQUIPMENT, AVAILABLE FEATURES, INTERCONNECTION ARRANGEMENTS WHERE NEEDED, COMMUNITY CONTACT PROCEDURES, AND OTHER RELATED ITEMS. TO GIVE AN APPRECIATION OF COSTS AND EFFORT REQUIRED TO IMPLEMENT THE TELEPHONE COMPANY PORTION OF 911 SYSTEMS, THE MANUAL EXPLAINS COST DIFFERENCES AMONG COMPANIES, PROJECTED COSTS OF THE SYSTEM, ESTIMATION OF THE POPULATION IN A COMMUNITY PER MAIN STATION NUMBERS, TERMINAL EQUIPMENT AND SPECIAL APPLICATION EQUIPMENT NEEDED, AND TARIFF CONSIDERATIONS. A SYNOPSIS OF THE ILLINOIS LAW REQUIRING THAT EVERY TELEPHONE COMPANY PROVIDE TELECOMMUNICATIONS CAPABILITY IN ORDER TO IMPLEMENT A BASIC 911 SYSTEM IS ALSO PRESENTED. APPENDIXES CONTAIN A GLOSSARY OF TERMS, A COPY OF THE RELEVANT ILLINOIS LAW, A LISTING OF EXISTING 911 SYSTEMS IN ILLINOIS, AND SAMPLES OF AN EMERGENCY SERVICE OPERATIONAL CHECKLIST, AN EMERGENCY CALL COUNT FORM, AND AN INTERDEPARTMENTAL COORDINATION SCHEDULE. (DAG)