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9-1-1 Terminology


A designated easy-to-remember, easy-to-dial three-digit emergency telephone number developed to provide citizens a reliable, fast and convenient way to access fire, police, or medical service providers in the event of an emergency.


McLennan County 9-1-1 Emergency Assistance District is the entity that provides enhanced 9-1-1 service in McLennan County. A board of managers appointed by participating jurisdictions governs the district.


Enhanced 9-1-1 designed to automatically route any 9-1-1 call, placed from a telephone instrument (including wireless) within the district’s geographical boundaries, to the proper public safety answering point (PSAP) responsible for dispatching emergency services to the caller.


Geographic Information Systems is the technology used to develop the mapped display of McLennan County.


Public Safety Answering Point is the location of the equipment used to answer 9-1-1 emergency calls.


Voice over Internet Protocol – The technology that provides telephone services over computer networks. The service may not provide any or all of the features of E9-1-1. Subscribers should check with their vendor to determine the level of 9-1-1 services available.


Selective Routing – The system that provides automatic routing of 9-1-1 calls based on the caller’s location to the appropriate PSAP. The caller is not required to determine which public safety agency to call.


Automatic Number Identification – The feature that provides the caller’s telephone number on a console at the PSAP.


Automatic Location Identification – The feature that provides the caller’s name and address on a computer monitor at the PSAP.


The information accompanying a 9-1-1 call at the PSAP. The information provided is the caller’s name, address and telephone number, as well as the emergency service providers designated to respond to the caller’s address Public Safety Telecommunicator The individual answering the 9-1-1 call; trained to communicate with persons seeking emergency assistance and with agencies and individuals providing such assistance.

Phase I

The Federal Communication Commission (FCC) mandate to the wireless telephone industry and 9-1-1 requiring the proper routing of wireless 9-1-1 calls to PSAPs and the provision of the callers’ ANI to the telecommunicators.

Phase II

The feature that provides the geographic location of wireless callers, in addition to the FCC’s Phase I enhancements.