Nortel Networks Remote Gateway 50 - Manual (Page 230)

Page 230 of 258 Emergency Services configuration
553-3001-207 Standard 2.00 January 2006
15 Configure the NRS for the ESA Special Number used.
16 Test ESDN using an analog (500/2500-type) telephone located at the
branch office.
17 Test ESDN using an SRG IP Phone in Normal Mode and in Local Mode.
Determining the dialing plan for ESA calls
In many jurisdictions of the United States and Canada, the emergency number
must be “911”. The call processor cannot have a DN that conflicts with these
digits, but since “9” is often used for NARS AC2 (the local call Access Code),
this is not usually a problem.
ESA for international deployment must support the standard emergency
number “112” and any emergency numbers in use prior to the EU directive.
In general, ESA calls should leave the network through a trunk at the branch
office where the originating telephone is located. To enable this, it is
necessary for telephones at each branch office to supply a unique identifying
prefix to the NRS when the ESA calls are being routed so that the NRS can
select a distinct route for each branch office. This prefix can be configured
with the zone data for the SRG telephones. The provisioning of this prefix is
an enhancement for branch office.
While a variety of numbering schemes are available, Nortel recommends that
customers use “0” + the ESN location code of the SRG + ESDN, where
ESDN is:
• for North America and CALA — “911”
• for members of the European Union — “112” and any other emergency
numbers in use prior to the EU directive
This number, referred to here as the ESA Special Number, is configured as a
special number (SPN) in the NRS so that the Virtual Trunk routes the call to
the branch office.