Enhanced 9-1-1wikipedia
Enhanced 911, E-911 or E911 is a system used in North America to automatically provide to dispatchers the location of callers to 911, the universal emergency telephone number in the region.
E911enhanced 9-1-1enhanced 911Wireless Enhanced 911E9-1-1911mobile emergency callsPhase II911 emergency call centerE911 services

9-1-1

9-1-1911911 call
Enhanced 911, E-911 or E911 is a system used in North America to automatically provide to dispatchers the location of callers to 911, the universal emergency telephone number in the region.
In approximately 96 percent of the U.S., the enhanced 9-1-1 system automatically pairs caller numbers with a physical address.

Emergency telephone number

emergency telephone numberemergency callemergency number
Enhanced 911, E-911 or E911 is a system used in North America to automatically provide to dispatchers the location of callers to 911, the universal emergency telephone number in the region.
Enhanced 911 and similar systems like E112 can provide the location of landline callers by looking up the physical address in a database, and mobile callers through triangulation from towers or GPS on the device.

Public safety answering point

public-safety answering pointpublic safety answering pointPSAP
An incoming 911 call is answered at the local governmental Public Safety Answering Point (PSAP) by a specially trained official known as a telecommunicator.
Most PSAPs are now capable of caller location for landline calls, and many can handle mobile phone locations as well (sometimes referred to as phase II location), where the mobile phone company has a handset location system.

Wireless Communications and Public Safety Act

In the US, the Wireless Communications and Public Safety Act of 1999, also known as the 911 Act, mandated the use of E911 and designated 911 as the universal emergency number, including both wireline and wireless phone devices.
The act required the setup of enhanced 911 and mandated that 911 serve as the emergency number for non-land line phones as well.

Assisted GPS

A-GPSaGPSassisted GPS
Alltel, Verizon Wireless, T-Mobile 3G, and Sprint PCS use Assisted GPS.
A-GPS is extensively used with GPS-capable cellular phones, as its development was accelerated by the U.S. FCC's 911 requirement to make cell phone location data available to emergency call dispatchers.

Plain old telephone service

POTSplain old telephone serviceLocal Telephone Service
These circuits are similar to traditional telephone lines, but are formatted to pass the calling party's number (Automatic Number Identification, ANI).
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.

Radio resource location services protocol

Radio Resource Location Protocolradio resource location services protocolRRLP
Both approaches are described by the Radio resource location services protocol (LCS protocol).
The protocol was developed in order to fulfil the Wireless Enhanced 911 requirements in the United States.

Location information server

LIS
The Location Information Server is a service that is provided by an access network provider to provide location information to users of the network.
The location information server, or LIS is a network node originally defined in the National Emergency Number Association i2 network architecture that addresses the intermediate solution for providing e911 service for users of VoIP telephony.

Mobile phone tracking

mobile phone trackinglocation informationmobile positioning
The Location Information Server is a service that is provided by an access network provider to provide location information to users of the network.
Frequently the compulsion associated with a legislative framework, such as Enhanced 9-1-1, is required before a service provider will deploy a solution.

112 (emergency telephone number)

1121-1-2112 (emergency telephone number)
In the European Union it is known as E112 as 112 is the emergency access number there, labeled as eCall when called by the vehicle.
This directive is based on the FCC's Enhanced 911 ruling in 2001.

Global Positioning System

GPSglobal positioning systemGlobal Positioning System (GPS)
Carriers were allowed to choose to implement 'handset based' location by Global Positioning System (GPS) or similar technology in each phone, or 'network based' location by means of triangulation between cell towers. One is to use some form of radiolocation from the cellular network; the other is to use a Global Positioning System receiver built into the phone itself.

Location-based service

location-based servicelocation-basedlocation-based services
Mobile phone users may also have a selection to permit location information to be sent to non-emergency phone numbers or data networks, so that it can help people who are simply lost or want other location-based services.
This can be especially useful when dialing an emergency telephone number – such as enhanced 9-1-1 in North America, or 112 in Europe – so that the operator can dispatch emergency services such as emergency medical services, police or firefighters to the correct location.

Reverse geocoding

reverse geocoding
Combined with geocoding and routing services, reverse geocoding is a critical component of mobile location-based services and Enhanced 911 to convert a coordinate obtained by GPS to a readable street address which is easier to understand by the end user.

ECall

eCall
In the European Union it is known as E112 as 112 is the emergency access number there, labeled as eCall when called by the vehicle.

Radiolocation

radiolocationCellular networkradio
One is to use some form of radiolocation from the cellular network; the other is to use a Global Positioning System receiver built into the phone itself.
This ability is known within the NANP (North America) as wireless enhanced 911.

Voice over IP

VoIPvoice over IPvoice over Internet Protocol
As Voice over Internet Protocol (VoIP) technology matured, service providers began to interconnect VoIP with the public telephone network and marketed the VoIP service as a cheap replacement phone service.
Such emergency services are provided by VoIP vendors in the United States by a system called Enhanced 911 (E911), based on the Wireless Communications and Public Safety Act of 1999.

National Emergency Number Association

These solutions are being developed through the cooperation of the Voice on the Network Coalition and the National Emergency Number Association.
NENA is tracking the deployment of Enhanced 9-1-1 and the Wireless Phase 1 and 2 initiatives.

Holdover in synchronization applications

holdoverholdover mode
Within the base station, besides standard functions, accurate timing and the means to maintain it through holdover is vitally important for services such as E911

Mobile phone features

mobile phone contentfeaturesCameras in mobile phones

Flowroute

Flowroute's services include SIP trunking, local DIDs and toll-free numbers, outbound termination, and network services such as E911, CNAM Lookup, CNAM Storage, and local number portability.

Loveland, Ohio

LovelandLoveland, OH
Dispatching for both is handled by Northeast Communications Center (NECC), which provides Wireless Enhanced 911 service and also activates the local network of tornado sirens.

S-GPS

sGPS
Ordinarily, a built-in, multi- dimensional GPS device is used to determine the location of an E911 call made from CDMA phones.