Avaya Nortel Communication Server 1000 Manual page 72

72 Features
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This applies to both the In-calls (PRIMARY) key and any secondary DN
key on the ACD telephone.
TPS failures do not impact general ACD functionality, because the ACD
feature is implemented on the Call Server.
CS 1000 base features
No feature works when the active IP Phone is disconnected and trying to
re-register with the Call Server. All the features can be used in the context
of the failover call after the IP Phone re-registers (if it is not a PARTIAL
REBUILT call).
The feature context is lost on the Call Server if the Call Server fails.
The feature context is not lost on the Call Server in a case of TLAN/ELAN
subnet failure. Only the feature data on the IP Phone display is lost.
Feature context in Call Server failures
The context of any feature is lost on the Call Server in cases of Call Server
failure (Call Server warm or cold start). The LTPS IP Phone display is lost
as the IP Phone re-registers. This means if a feature is activated and the
Call Server fails, all the user input and data is lost.
Example: IP Phone A is in a call; the user presses the Transfer key and
starts dialing a DN. The Call Server cold or warm starts. Therefore, IP
Phone A does not accept the user input and tries to re-register with the
Call Server. When the Call Server comes back up and the IP Phones
re-register, IP Phone A does not have the Call Transfer activated. The held
call is also lost: it is not rebuilt after INI or by the ACF feature, because
the call is not active.
TLAN/ELAN subnet and LTPS failures
When a network or Signaling Server/Voice Gateway Media Card failure
occurs and the active IP Phone has some feature activated, the feature
context and data is not lost on the Call Server. The user can proceed with
the feature after the IP Phone re-registers. Only the LTPS display is lost
when the IP Phone re-registers.
Example: IP Phone A is in a call; the user presses the Transfer key, and
starts dialing a DN. A TLAN subnet failure occurs when the first digit is
dialed. The user is unaware of the failure and continues dialing the DN. The
digits dialed after the failure are ignored, the IP Phone detects the failure,
clears the display, and tries to re-register with the server.
Copyright © 2003–2008, Nortel Networks
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In the case of a Call Server cold start (SYSLOAD), the active calls are
dropped and the agents are logged out.
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008