Avaya IP Line User Manual download pdf (Page 94)

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Page 94 of 910 Features

553-3001-365 Standard 4.00 August 2005

the failover call after the IP Phone reregisters (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’s 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 reregisters. 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 reregister with the Call Server.

When the Call Server comes back up and the IP Phones reregister, 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, since 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 reregisters. Only the LTPS display is lost when the IP

Phone reregisters.

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 reregister with the server.

The TLAN comes up again and the IP Phone reregisters. Although the IP

Phone is now idle and the display is cleared, the IP Phone can resume dialing

the DN starting from the second digit. The IP Phone can also return to the held

call by pressing the held call’s DN key.

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Avaya IP Line User Manual Page 94

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