192 Emergency Services configuration
Configuring ESA for the branch office
For ESA, the main office Call Server forwards the call to the branchoffice
for termination. Calls are redirected over a Virtual Trunk using the NRS. 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 the main office Call Server and the
SRG to differentiate between emergency calls originating from IP Phones at
each location and calls originating on trunks, which refers to the forwarded
emergency call that the SRG receives from the main office foran IP Phone
in Normal Mode.
Use the following steps to configure ESA for emergencyaccess at each
location:
At the main office:
Step Action
1Determine the dialing plan (for example, numbering plan) for ESA
calls.
2Configure the main office emergency trunk (CAMA or PRI).
For EMEA, the following trunks are supported:
•BRIE (Basic Rate Interface–ETSI based)
•PRI (Primary Rate Interface per EURO ISDN)
•QSIG on PRI
•DPNSS
•IP tandem trunks on ISDN
3Configure the Virtual Trunk at the main office.
4Configure ESN at the main office.
5Configure ESA at the main office.
6Configure the SRG zone on the main office.
Configure a zone foreach branch office which is used in conjunction
with ESA parameters to route an emergency call to the SRG.
7TestESDN using a main office telephone.
8Configure the SRG emergency trunk (CAMA or PRI).
9Configure the Virtual Trunk at the MG 1000B.
10 Configure ESN at the branch office.
Nortel Communication Server 1000
Main Office Configuration Guide forSRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright© 2005-2007, Nor tel Networks
.