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The minimum ANI equipment for a PSAP is the ANI Controller, the ANI Transfer/Display unit/computer screen, and a regular telephone instrument or phone system (computerized) on which the call is actually answered. In addition, an ANI auxiliary controller and ANI additional trunk equipment may be required dependent upon the number of incoming trunk lines and the number of ANI Transfer/Display units at the PSAP. ANI equipment is needed for the 9-1-1 system to display at the PSAP the telephone number from which the 9-1-1 call is being made, and for the alternate routing call transfer, forced disconnect, call hold, call return, and hard copy record features. ANI equipment is a prerequisite for the ALI equipment which, at a minimum, would consist of the ALI Controller and the ALI display unit. In addition, miscellaneous wiring is needed for each ALI display unit. Also, an ALI auxiliary controller may be needed depending of the number of ALI display units at the PSAP. The ALI equipment is needed in order for the 9-1-1 system to display at the PSAP the address from which the 9-1-1 call is originating. TRUNK AND TELEPHONE LINES A PSAP must maintain at least one ten -digit telephone number. All PSAPs must be equipped with a minimum of two CAMA trunk lines dedicated to 9-1-1 call processing. SELECTIVE ROUTING This feature automatically routes the 9-1-1 call to the PSAP serving the area in which the 9-1-1 call originates. ANI —AUTOMATIC NUMBER IDENTIFICATION This feature displays the telephone number from which the 9-1-1 call is being made. ALI —AUTOMATIC LOCATION IDENTIFICATION This feature displays the telephone number, address, and type of telephone (residential, business, cellular, or pay) from which the 9-1-1 call is being made, and also displays the police, fire, and emergency medical service providers for the listed address. Primary PSAP CPE (customer premise equipment) minimum requirements include ANI/ALI receipt/display, a database of 9-1-1 call data, one button transfer, and abandoned call display. 3.4 Special Call Handling Misrouted Calls Calls initially misdirected to the wrong PSAP may be transferred to the appropriate PSAP via one -button transfer when possible. If one -button transfer cannot be made, all information shall be obtained and dispatched or relayed to the proper dispatch point/PSAP via most expeditious method — radio or telephone. If the misdirection is a result of an improper transfer, the caller shall NOT be transferred again. All information shall be obtained and, via most expeditious method, dispatched or relayed to the appropriate agency. 9-1-1 Calls may be transferred to the appropriate PSAP when required. 24