Avaya Nortel Communication Server 1000 Manual page 65
Ip line fundamentals
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- Reference (700 pages) ,
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Scenario
Network branch office
•
Branch IP Phones A and B belong to
different branches – Branch A and Branch B
respectively. IP Phones A and B are registered
on the main office Call Server.
•
A call is established between IP Phones A and
B.
•
Main office Call Server failure occurs and IP
Phones A and B register with their branches
in local mode.
IP/TDM call with TLAN subnet failure
•
IP Phone A has a call with a TDM telephone
or trunk B.
•
IP Phone A TLAN subnet connection fails.
•
Active IP Phone A re-registers with the Call
Server as the TLAN subnet comes back up.
Network Call Server warm start
•
IP Phone A has an IP Peer call with a remote
user over a virtual trunk.
•
The Call Server warm starts.
•
Active IP Phone A re-registers with the Call
Server as the TLAN subnet comes back up.
Network Call Server cold start
•
IP Phone A has an IP Peer call with a remote
user over a virtual trunk.
•
The Call Server cold starts.
•
Active IP Phone A re-registers with the server
as the TLAN subnet comes back up.
Copyright © 2003–2008, Nortel Networks
.
Result
The call is not lost.
The scenario for each branch is the same
as the first 3 steps of
branch office (scenario
know about IP Phone B and Branch B does
not know about IP Phone A. Therefore, each
branch builds the PARTIAL REBUILT call.
Two local PARTIAL REBUILT calls exist on
the branches as the IP Phones re-register in
local mode. The calls are never transitioned
to the REBUILT state and exist until the IP
Phones release the call.
The call is not lost.
The scenario is the same as
failure
call has the following transitions: NO ACF ->
HALF REGISTERED -> UNREGISTERED.
The call is not lost.
The scenario is same as if the far end were a
local IP Phone. See
The call is lost as the Call Server comes back
up.
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
Active Call Failover for IP Phones 65
Main office failure for
2). Branch A does not
and
Network TLAN subnet
Call Server warm
TLAN subnet
failure. The
restart.
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