|
|
E911 for Digital and Analog Phones
Comprehensive E911 protection requires proper configuration of
and integration with all call servers, PBXs and gateways on the network.
There are two key requirements for E911 – the ten-digit
number (ANI/ELIN) that is out-pulsed by the PBX/call server and the Automatic Location
Identification data record (ALI/ERL) that is stored in the regional database. For
E911 to work, three things need to happen to tie these two components together.
1) The PBX/Call Server must be configured to out-pulse the proper ten-digit (ANI/ELIN)
number of the 911 caller. This is usually the DID number of the caller.
2) Local ISDN-PRI or CAMA trunks must be implemented to send the ANI/ELIN over the
Public Switched Telephone Network (PSTN) to the local Public Safety Answering Point
(PSAP).
3) The regional ALI database must be populated with the ALI records that contain
the detailed location information associated to each ANI/ELIN.
When 911 is dialed, the 911 dispatcher at the local PSAP receives the ANI/ELIN,
which accesses the regional ALI database to pull up the detailed ALI record defining
the exact address and location of the caller.
For purposes of illustration, here is a diagram of how an emergency call is handled
when placed from a traditional PBX/Call Server-based phone system equipped with
RedSky's E911 Manager™.
|
