CHAPTER23 Digital PSTN
Mediant 1000 Gateway & E-SBC | User's Manual
Configuring CAS State Machines
The CAS State Machine table lets you 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):
■ Single CAS table per trunk
■ Different CAS table per group of B-channels in a trunk
● CAS is applicable only to ISDN PRI interfaces.
➢ To modify the CAS state machine parameters:
1. Open the CAS State Machine page (Setup menu > Signaling & Media tab > Gateway folder
> Trunks & Groups > CAS State Machines).
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), select the required Trunk number icon, and
then click Stop Trunk.
3. In the CAS State Machine table, 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 Apply, and then reset the device.
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