Avaya Nortel Communication Server 1000 Manual page 70

70 Features
NAT
The NAT discovery is delayed for an IP Phone with an active call when it
re-registers. NAT discovery messages are sent through the port used for
the RTP stream. NAT discovery is not initiated if the LTPS detects that the
IP Phone has an active RTP stream.
Personal Directory, Callers List, Redial List
The display content is cleared and the Personal Directory/Callers List/Redial
List applications are reset when the active call failover process starts. The
applications can be used again only after the IP Phone re-registers. A user
that is using one of the Personal Directory/Callers List/Redial List menus
sees the display clear and loses any data in that transaction that was not
selected or saved with the Personal Directory/Callers List/Redial List feature.
ACF implementation does not maintain data present only on the Signaling
Server/Voice Gateway Media Card. Transient data (for example, the
Services key submenu the user is currently in) is lost when the failover
occurs and the IP Phone re-registers.
Converged Desktop
If the Call Server maintains the active call information during the active
call failover, and the SIP Gateway maintains the link and information with
the MCS 5100 (the SIP Gateway has not failed or is not on the Signaling
Server that reboots if that is the failure mode), a Converged Desktop call is
maintained when the involved IP Phone re-registers to the system. If the
Call Server loses the call information or the SIP Gateway Signaling Server
reboots, the Converged Desktop call is impacted.
A Converged Desktop consists of a telephone and multimedia PC Client
(PCC) software.
The following are scenario examples.
Example 1: The IP Phone TLAN subnet fails and the IP Phone re-registers
with the same or a different TPS.
In this case, both the voice and multimedia sessions survive: if a SIP call is
established with the other party in the SIP domain, the call is not released
as the IP Phone re-registers. The multimedia applications still work: the
presence is updated on PCC after the telephone re-registers.
If the unregistered converged IP Phone releases the call during the TLAN
subnet failure, the Presence status is updated on PCC as the idle converged
IP Phone re-registers.
Copyright © 2003–2008, Nortel Networks
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Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008