Avaya 1000 Installation And Commissioning Manual page 183

Unknown) are assigned. Unknown location indicates default (basic) emergency processing (per
LD 24), which is acceptable for a small branch. A system message is also generated to
indicate that the phone location data was actually unknown and defaults were used, but
emergency calls should be handled correctly.
Minimally configured branches (without LIS support) should be configured as manual update.
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.
The basic ESA feature only provides for a single ESA route per system. Since all IP Phones are
associated with the same main office, all ESA calls therefore go to the same Public Safety
Answering Point (PSAP) regardless from which Branch Office they originated. This is not
satisfactory if the branch offices are widely dispersed.
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 MG 1000B telephones. The provisioning of this prefix is an enhancement for Branch
Office.
While a variety of numbering schemes are available, Avaya recommends that customers use "0" +
the ESN location code of the MG 1000B + 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.
Configuring the main office
You can use Element Manager or the Command Line Interface for this procedure. Refer to Avaya IP
Peer Networking Installation and Commissioning, NN43001-313 for details.
1. Configure the main office emergency trunk (CAMA or PRI).
Configure either analog CAMA or digital PRI to correctly signal the call identification.
ESA overrides all security features. Configure the trunk with restrictions so that other
features cannot access the trunk.
2. Configure the Virtual Trunk using the procedure from Avaya IP Peer Networking Installation
and Commissioning, NN43001-313.
The Virtual Trunk must be configured to enable emergency calls originating from MG 1000B
IP Phones registered at the main office to reach the Branch Office.
June 2014 Branch Office Installation and Commissioning
Comments? infodev@avaya.com
Emergency Services Access (ESA)
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