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User Guide V
2
IU 4300T Converged Network Appliance
3 - 48
1. Log into the V
2
IU appliance using a Netscape or Internet Explorer web
browser.
2. Select System.
3. Select Survivability.
4. Enter the desired values for Time between heartbeat messages, Time to
declare heartbeat lost, Number of lost messages to declare alarm and
Number of received messages to clear alarm in the Softswitch
Reachability section of the web page.
5. Press Submit.
The reachability settings are used to determine when the V
2
IU appliance
provides local call switching by entering fallback mode and when it returns
call control to network based call processing servers. The definitions of the
reachability settings are as follows:
Time between heartbeat messages - The number of seconds between each
heartbeat message sent to the call processing servers to determine
connectivity.
Time to declare heartbeat lost – The number of seconds that the V
2
IU appliance
will wait before declaring a response to a heartbeat message lost.
Number of lost messages to declare alarm - the number of consecutively lost
responses to heartbeat messages required for the V
2
IU appliance to declare a
loss of connectivity to the network based call processing server.
Number of received messages to clear alarm - the number of consecutively
received responses to heartbeat messages required for the V
2
IU Appliance to
declare successful connectivity to the network based call processing server.
The formula used to determine the maximum time for the V
2
IU appliance to
declare a loss of connectivity to a call processing server is: maximum time =
(X * Y) + Z, where,
X = Time between heartbeat messages
Y = Number of lost messages to declare alarm
Z = Time to declare a heartbeat lost
The default value for X, Y and Z in the V
2
IU appliance is 5. Therefore, the
default maximum time to declare a call processing server unreachable is 30
seconds or ((5*5) + 5).
Step 3 - Specify the number of digits to use for local dialing
This field is the number of digits that the V
2
IU appliance will use for dialing
when providing local call switching. By default the V
2
IU appliance will use 4,
7 and 10 digit dialing. Please follow the steps below if you would like to use a
different number of digits:
1. Log into the V
2
IU appliance using a Netscape or Internet Explorer web
browser.