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•CPND block: uses the English string VOLO and is automatically
configured against the primary key of all the emergency TNs.
•DES: All the emergency TNs have the ESTN designator.
•DN: The emergency DN configured by administrator. The primary
DN, that is configured by the administrator, is sent to the OSN
phone/terminal, so that callback to this phone is possible.
CLID Composition
In Release 4.5 and earlier, the CLID configuration isstatic. The static CLID
entry is configured in LD 15 and associated with the phone in overlays
10 and 11.
Such a static CLID may not correctly identify the physical location of the
logged out phone. The pool of emergency TNs is shared by all phones
configured in the system, so any phone can use the same CLIDentry.
Toidentify the physical location of the logged out phone using its CLID, the
Location Auto Update mechanism, introduced by the ESA Client Mobility
feature is required.
ESA VO Logout Timer
A special ESA VO Logout timer is created for everylogged outphone with
the emergency TN allocated. The emergency TN is released and the phone
returns to the original logged out state when this timer expires.
The timer is created and set to 60 seconds as soon as theemergency TN is
allocated. The timer stops only after the user completes dialing the ESA
number.
In other words, the user has a maximum of 1 minute to dial an ESA number.
After the 1 minute, all key presses are lost and youmust re-initiate the call.
The ESA VO Logout Timer also includes the case when user dials a wrong
number, in which they will receive overflowtone and Release andtry again
message on phone display.
The Release and try again messageprevents the ESTN from abnormally
remaining on the call server, for example,due to the accidentalpressing the
primary key or dropping the handset.
•The timer stops upon initiation of the ESA call (forexample, while waiting
for answer and connect phases).
•The timer restarts as the user completes the ESA call. The timer is
set to a preconfigured period (20 minutes by default) so the user can
receive a callback during that period.
•The timer restarts again if the user makes another ESA call.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June2007
Copyright© 2007, Nor tel Networks
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