Avaya Nortel Communication Server 1000 Manual page 71

Example 2: The IP Phone Signaling Server fails and the IP Phone
re-registers with the same or a different TPS (active converged IP Phone
and SIP Gateway are on different Signaling Servers in the same node).
In this case, both the voice and multimedia sessions survive; the scenario is
the same as the TLAN subnet failure in Example 1.
Example 3: The IP Phone ELAN subnet fails and the IP Phone re-registers
with the same or a different TPS.
The voice session survives. If the ELAN subnet comes back up before
the IP Phone changes the call state (that is, releases the call), then the
multimedia session is not impacted.
If the IP Phone releases the call when the ELAN subnet is still down, the
PCC status update happens when the idle converged IP Phone re-registers
with the system.
If the call is released by the supervisory timer, the status is updated on PCC
after the ELAN subnet comes back up and the Converged Desktop AML
ELAN subnet link is enabled (the CSA104 message is output on the Call
Server when this happens).
Example 4: Call Server warm start.
The voice and multimedia sessions survive. The Presence status is updated
on PCC as the converged IP Phone releases the call after the warm start.
Example 5: Call Server cold start.
The voice and multimedia sessions are closed as the Call Server comes up.
The Presence status becomes Connected - Idle even if the call is rebuilt and
active after the Call Server cold start.
IP Phone firmware downloads
The firmware is not downloaded to an IP Phone that has an active RTP
stream open when it registers with the failover system. The firmware
is downloaded later when the idle IP Phone registers again or by using
appropriate CLI commands.
IP Phone as ACD agent or supervisor telephone
If an IP Phone is used as an ACD agent (or supervisor) and the Call Server
fails:
•
Copyright © 2003–2008, Nortel Networks
.
In the case of a Call Server warm start (INI), the active calls are retained
on the agent telephone.
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
Active Call Failover for IP Phones 71