Instruction manual

Meridian 911 Page 2041 of 3156
Features and Services
To protect a caller’s right to privacy, some communities still allow the use of
seven-digit emergency numbers, routed either to an answering center or
directly to the responding agency.
Basic 911 service
Basic 911 service routes emergency calls to an answering center based on the
location of the Public Exchange/Central Office serving the calling station.
The jurisdiction of an answering center is determined by the Central Office
boundaries. The most basic 911 system involves only one Central Office and
one exchange service area, and can be a single answering center.
Enhanced 911 service
In areas where telephone company Central Office boundaries do not match
jurisdictional boundaries, there is a problem in identifying which emergency
agency should receive the emergency call. There may be an even more
complicated situation if the 911 network includes two or more primary
answering centers, and each serves areas that do not match the Central Office
serving areas.
Enhanced 911 (E911) service ensures that an emergency call originating in
any particular jurisdiction covered by the 911 system is recognized and
forwarded to the appropriate responding agency in the same political or
geographical jurisdiction as the originating call.
Enhanced 911 service uses more sophisticated equipment and features than
basic 911 service. Specialized features include:
• Automatic Number Identification (ANI)
• Automatic Location Identifier (ALI), and
• Selective Routing (SR).
Display of the ANI associated with the originating call sometimes replaces
the need for the following basic 911 options: Called Party Hold; Emergency
Ringback; and Switchhook Status. Therefore, sometimes these features are
not provided with enhanced 911 service.