Configuring Cas State Machines - AudioCodes Mediant 1000B User Manual

21.3

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):

Single CAS table per trunk

Different CAS table per group of B-channels in a trunk

To modify the CAS state machine parameters:
1. Open the CAS State Machine page (Configuration tab > VoIP menu > PSTN > 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'' on page 333),
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 565).
Notes:
•
The CAS state machine can only be configured using the Web-based
management tool.
•
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.
•
The modification of the CAS state machine occurs at the CAS application
initialization only for non-default values (-1).
•
For more information on the CAS Protocol table, refer to the CAS Protocol Table
Configuration Note.
User's Manual
Figure 21-3: CAS State Machine Page
338
Mediant 1000B Gateway & SBC
Document #: LTRT-27034