Features Page 85 of 910
IP Line Description, Installation and Maintenance
Network-wide operation — 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 reregisters with the Call
Server as the TLAN subnet comes back
up.
The call is lost as the Call Server comes up.
Network-wide operation — 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.
The call is not lost.
The scenario for each branch is the same as
the first 3 steps of “Main office failure for
branch office (scenario 2):” on page 82.
Branch A does not 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 reregister in
local mode. The calls are never transitioned to
the REBUILT state and exist until the IP
Phones release the call.
IP/TDM call with TLAN subnet failure:
• IP Phone A has a call with a TDM
telephone or trunk B.
• IP Phone A’s TLAN subnet connection
fails.
• Active IP Phone A reregisters with the Call
Server as the TLAN subnet comes back
up.
The call is not lost.
The scenario is the same as “TLAN subnet
failure:” on page 79 and “Network-wide
operation — network TLAN subnet failure:” on
page 84. The call has the following transitions:
NO ACF -> HALF REGISTERED ->
UNREGISTERED.
Table 13
ACF behaviors (Part 7 of 8)
Scenario Result