Nortel Networks NN43001-314 - Manual (Page 330)

330 Basic Emergency Services When VO Logged Out
New functionality is introduced: to provide the ability for the logged out
phone to make ESA calls and receive callbacks, temporarily register with
the Call Server. The registration begins as the user tries to make a call
from the logged out phone by going off hook or pressing the primary key,
or using the handsfree or headset.
Making an ESA Call From a Logged Out Phone
The Call Server is provisioned with a pool of Emergency Terminal Numbers
(TNs) referred to as Emergency Services Access Terminal Number (ESTN)
in this document. The ESTN is allocated from this pool to register the
logged out phone.
As the logged out phone registers with the Call Server using the allocated
ESTN, the key presses are transmitted to the Call Server according to the
existing operation, so the Call Server is fully responsible for initiating the
call. The Call Server normally provides the dial tone and collects the digits.
The logged out phone can make ESA calls only. The configured ESTNs are
fully restricted. As the Directory Number (DN) translation is complete, the
Call Server checks the type of the DN and proceeds with the call only if an
Emergency Services Access Directory Number (ESDN) or other locally
routed emergency DNs as defined per ESA feature is dialed.
Scenario: Process Event In VO Logout State
Receiving ESA Callback
After the ESA call is complete (released by one of the parties), the logged
out phone registers with the Call Server for a preconfigured period of time
(20 minutes by default). During this time the phone continues to use the
ESTN allocated for the ESA call.
The logged out phone can receive calls from any source during this period,
which makes it possible to receive ESA callbacks from PSAP or local
security service.
As the preconfigured time out is complete, the Call Server unregisters the
phone. The phone moves to the original logged out state and the phone
ESTN becomes available to other ESA calls from any other VO logged
out phone.
ESA Call Processing
The ESA call from the logged out phone is processed in the same way as
the ESA call from a normally registered phone. The information configured
in the emergency TN block is provided to the OSN phone/terminal. This
includes
• Name: LoggedOut.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.