Avaya Nortel Communication Server 1000 Manual page 327

Table 88
e911 process for IP Phones logged in to Virtual Office
Description
Step
1 The LTPS aborts the call on the remote Call Server.
2 The LTPS displays Emergency Call on the IP Phone.
3
The LTPS logs the IP Phone out of Virtual Office.
4 The LTPS reconnects to the local Call Server.
5 The LTPS restarts the 911 call, thus reaching the correct PSAP.
The extra processing adds 5 seconds to the call setup time.
6 After the emergency call ends, the IP Phone remains registered to the Home LTPS
as a normal telephone, in case the PSAP makes a call back to the originator of
the emergency call.
After the IP Phone is redirected to its Home Site, it is not allowed to initiate a new
operation for five minutes. This prevents the user from accidentally dialing the
emergency DN and hanging up. In this case, the emergency response personnel
might call back to confirm the accidental call (and thus confirm that there is no
emergency). If the IP Phone were allowed to immediately resume a Virtual Office
logon to another site, it could not receive the call back.
If the local TN has another IP Phone Virtual Office logged into it when it comes back,
the non-emergency IP Phone is pre-empted. If this occurs, ESAxxx messages are
generated on the system TTY.
Emergency Services Access while logged out of Virtual Office
If 911 is dialed while logged out of Virtual Office, the LTPS redirects the 911
call to the local area 911 service (PSAP), not the remote Call Server 911
service. The Call Server is provisioned with Emergency Service Access
Terminal Numbers (ESTN). The ESTN is used to register the IP Phone with
the Call Server. The logged out IP Phone can make ESA calls only. See
Table 89 "e911 process for IP Phones while logged out of Virtual Office"
(page
Table 89
e911 process for IP Phones while logged out of Virtual Office
Step Description
1 The LTPS aborts the call on the remote Call Server.
2
The LTPS displays Emergency Call Only on the IP Phone.
Copyright © 2003–2008, Nortel Networks
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327).
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
IP Line feature administration 327