Nortel Networks NN43001-314 - Manual (Page 317)

Emergency Services Access (ESA) 317
The Selective Router looks up the caller’s ANI in its Selective Routing Data
Base (which is synchronized with the ALI database) to determine the correct
PSAP and then routes the emergency call appropriately. Hence, the call can
be routed to any CO in the correct E911 Tandem area. The Selective Router
automatically routes the call to the appropriate PSAP based on the ANI.
In areas that support Basic 911, the route to the PSAP is determined by the
PSTN access point. Hence, the call must be routed to the nearest CO to
the caller. ESA can specify a route for each ERL, which meets the more
stringent requirement of Basic 911. In areas with Enhanced 911, system
administrators have more flexibility in how to route their emergency calls
to the PSTN.
Configuring ESA for the Branch Office
For ESA, the main office Call Server forwards the call to the Branch Office
for termination. Calls are redirected over a Virtual Trunk using the NRS
services. The NRS routes the calls using a special number, referred to in
this section as the ESA Special Number.
ESA must be configured and tested on each call processor (the main
office Call Server and each MG 1000B CP PM) to differentiate between
emergency calls originating from IP Phones at each location and calls
originating on trunks.
The steps to configure ESA for emergency access at each location are:
Step Action
1 Determine the dialing plan for ESA calls.
2 Configure the main office emergency trunk (CAMA or PRI).
3 Configure the Virtual Trunk at the main office.
4 Configure ESN at the main office.
5 Configure ESA at the main office.
6 Configure the branch zone on the main office.
7 Configure the ESA Special Number on the main office.
8 Test ESDN using a main office telephone.
9 Configure the MG 1000B emergency trunk (CAMA or PRI).
10 Configure the Virtual Trunk at the MG 1000B.
11 Configure ESN at the Branch Office.
12 Configure ESA at the Branch Office.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
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