Avaya Nortel Communication Server 1000 Manual page 61
Ip line fundamentals
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ACF scenarios
Table 16 "ACF behaviors" (page 61)
scenarios.
Table 16
ACF behaviors
Scenario
TLAN subnet failure
•
A call is established between IP Phones A and
B registered with the same node.
•
TLAN subnet goes down.
•
The IP Phones detect the connection is lost
and periodically try to re-register.
•
The TLAN subnet is up shortly (less than 10
minutes), or an election is called and another
accessible LTPS node acquires the node IP
address. The IP Phones re-register with the
node again.
Signaling Server/Voice Gateway Media Card
platform failure
•
A call is established between IP Phones A and
B registered with the same node.
•
The LTPS node goes down.
•
The IP Phones detect the connection is lost
and periodically try to re-register.
•
The LTPS node is up shortly (less than 10
minutes), or an election is called and another
accessible LTPS node acquires the node IP
address. The IP Phones re-register with the
node again.
Call Server warm restart
•
A call is established between IP Phones A and
B registered with the same Call Server.
•
The Call Server warm restart (INI) occurs.
•
The users of IP Phones A and B do not go
on-hook or press any keys during the Call
Server restart.
Copyright © 2003–2008, Nortel Networks
.
Result
The call is not lost as the IP Phones re-register.
In this scenario, the call exists on the Call
Server during the failover time and has the
following transitions:
UNREGISTERED ->HALF-REGISTERED ->
NO ACF
The call is not lost as the IP Phones re-register.
The scenario is similar to the TLAN subnet
failure, but the ACF call transition on the
Call Server is instantaneous, because Offline
events are generated in a group as the ELAN
subnet goes down.
The call is not lost.
The call is rebuilt after the warm restart and
has the following transitions:
UNREGISTERED->HALF REGISTERED->N
O ACF.
The transition is almost instantaneous
because the Online messages are sent in a
group as a response to the Sync Request.
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
Active Call Failover for IP Phones 61
describes ACF behavior in different
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