Version 6.2 99 February 2011
SIP User's Manual 3. Web-Based Management
3.3.2.4.1 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
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.
• The modification of the CAS state machine occurs at the CAS application
initialization only for non-default values (-1).
• For a detailed description of the CAS Protocol table, refer to the Product
Reference Manual.
¾ To modify the CAS state machine parameters:
1. Open the ‘CAS State Machine' page (Configuration tab > VoIP menu > PSTN
submenu > CAS State Machines).
Figure 3-49: 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
101), sele
ct 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.
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