Nortel Remote Gateway 50 Configuration Manual page 229

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.
Use the following steps to configure ESA for emergency access at each
location:
1 Determine the dialing plan (for example, numbering plan) for ESA calls.
2 Configure the main office emergency trunk (CAMA or PRI).
For EMEA, the following trunks are supported:
•
•
•
•
•
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 SRG zone on the main office.
7 Configure the ESA Special Number on the main office; for example, the
prefix for the SRG zone.
8 Test ESDN using a main office telephone.
9 Configure the SRG 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.
13 Configure the branch office zone on the branch office.
Note: The branch office zone is required for bandwidth management but
does not require ESA parameters.
14 Configure the ESN SPN on the branch office.
Main Office Configuration for Survivable Remote Gateway 50
Emergency Services configuration
BRIE (Basic Rate Interface–ETSI based)
PRI (Primary Rate Interface per EURO ISDN)
QSIG on PRI
DPNSS
IP tandem trunks on ISDN
Page 229 of 258
Configuration Guide