Premises Based Ali Systems; Psap Display - BellSouth E911 Owner's Manual

Bellsouth wireless router owner guide

Table of Contents

Wireless E911 Guide

Overview of E911

wireless carrier providing a real-time update to the ALI databases during 9-1-1 call processing. Phase

2 requires both of the data elements provided in Phase 1 plus the longitude and latitude of the caller's

location when they dialed 9-1-1. BellSouth supports E2 connectivity between MPCs and the ALI database

hosts as defined in BellSouth Technical Reference TR73610, Issue 2. BellSouth will deliver the lat / long

data to the PSAP in the ALI response message as described in BellSouth Technical Reference TR73528,

Issue 6. Wireless Carriers must ensure dynamically updated records will comply with TR73528 when

delivered to the PSAP. These Technical References may be found on the following web site:

Note:

To receive the maximum benefit of E911, the initial ALI database record must be assigned an

MSAG valid address even if the tower is located in a rural area. MSAG valid addresses are

obtained from the addressing authority in the E911 area where the cell site is located.

1.1.4

Premises Based ALI Systems

Premises based ALI systems may have a separate database, software, and hardware located on the E911

Customer premises. Wireless Carriers must identify all premises based systems in their service areas and

comply with any special data or interface requirements. Carriers should meet with PSAPs to determine

if selective routing or direct trunking is used to deliver 911 calls. If calls are not selectively routed to

premises based ALI systems, the carrier may need to deliver wireless 911 calls to the PSAP administrative

lines or use other arrangements as negotiated with the PSAP. This guide does not address issues related to

premises based ALI systems.

1.2

The PSAP display for the ANI and ALI has been configured so that the PSAP attendant can immediately

recognize from the English Language Translations (ELT) that the call is being made from a wireless

device. The ALI response may contain the cell site sector location, subscriber call back number, and

lat/long when available. An example of a typical PSAP display is shown. This screen/display will vary

based on which PSAP equipment is chosen by the E911 Customer.

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CG-EWCG-001

Issue 3, January 6, 2004

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