Nortel Networks NN43001-314 User Manual

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Emergency Services configuration

Configure the Branch Office zone on the Branch Office.

Configure the ESN SPN on the Branch Office.

Configure the NRS for the ESA Special Number used.

Test ESDN using an MG 1000B IP Phone.

Test ESDN using an analog (500/2500-type) or digital telephone
located at the Branch Office.

—End—

Reregistering to minimally configured branch

A Branch User in Local Mode but not physically at the branch may get
incorrect emergency service handling. A Branch Office (for example,
Survivable Branch Office or Survivable Remote Gateway) may not be
provisioned with knowledge of all the ERLs in the enterprise. In this case,
one of two scenarios occurs if an IP phone reregisters to the branch (either
by VO ESA redirection or by fallback to Local Mode):

•

If the local TN is provisioned as Manual Update, then the phone inherits
the static location data. The static location data probably indicates basic
ESA processing (per LD 24) if this is a small branch.

•

If the local TN is provisioned as Auto Update, then cached location data
in the phone is rejected if undefined locally, and unknown location values
(ERL = 0, ECL = 0, LocDesc = 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.

Nortel Communication Server 1000

Branch Office Installation and Commissioning

NN43001-314

01.02

Standard

Release 5.0

20 June 2007