23.3 Configuring CAS State Machines
The CAS State Machine page allows you to modify various timers and other basic
parameters to define the initialization of the CAS state machine without changing the state
machine itself (no compilation is required). The change doesn't affect the state machine
itself, but rather the configuration.
The CAS table used can be chosen in two ways (using the parameter CasChannelIndex):
Different CAS table per group of B-channels in a trunk
Note: The CAS state machine can only be configured using the Web-based
management tool.
To modify the CAS state machine parameters:
1. Open the CAS State Machine page (Configuration tab > VoIP menu > PSTN
submenu > CAS State Machines).
Figure 23-2: CAS State Machine Page
2. Ensure that the trunk is inactive. The trunk number displayed in the 'Related Trunks'
field must be green. If it is red, indicating that the trunk is active, click the trunk number
to open the Trunk Settings page (see 'Configuring Trunk Settings' on page 277),
select the required Trunk number icon, and then click Stop Trunk.
3. In the CAS State Machine page, modify the required parameters according to the
table below.
4. Once you have completed the configuration, activate the trunk if required in the Trunk
Settings page, by clicking the trunk number in the 'Related Trunks' field, and in the
Trunk Settings page, select the required Trunk number icon, and then click Apply
Trunk Settings.
5. Click Submit, and then reset the device (see 'Resetting the Device' on page 621).
Notes:
• Don't modify the default values unless you fully understand the
implications of the changes and know the default values. Every change
affects the configuration of the state machine parameters and the call
process related to the trunk you are using with this state machine.
• You can modify CAS state machine parameters only if the following
conditions are met:
1) Trunks are inactive (stopped), i.e., the 'Related Trunks' field displays
the trunk number in green.
2) State machine is not in use or is in reset, or when it is not related to
any trunk. If it is related to a trunk, you must delete the trunk or de-
activate (Stop) the trunk.
• Field values displaying '-1' indicate CAS default values. In other words,
CAS state machine values are used.
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