Troubleshooting guide

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Cisco PGW 2200 Softswitch Release 9.8 Operations, Maintenance, and Troubleshooting Guide
OL-0800-14
Chapter 3 Cisco PGW 2200 Softswitch Platform Operations
Regular Operations
• Retrieving MCL Threshold Values, page 3-94
Mapping Machine Congestion Level to the ANSI or ITU Congestion Standard
When the Cisco PGW 2200 Softswitch is overloaded, it sends an ACL value to adjacent signaling points
in an ISUP release message that is based on the MCL. Because ANSI- and ITU-based signaling points
have different maximum ACL values, the Cisco PGW 2200 Softswitch uses a property, MaxACL,
associated with an SS7 signaling service or trunk group, to map the ACC maximum overload level value
to the maximum ACL value used by the adjacent signaling point.
ANSI-based signaling points have a maximum ACL value of 3. ITU-based signaling points have a
maximum ACL value of 2. The ACC maximum overload level value is 3. When MaxACL is set to 3, the
maximum MCL value is mapped to the ANSI standard. (The default value for MaxACL is 3.) When
MaxACL is set to 2, the maximum MCL value is mapped to the ITU standard. MaxACL also has a third
possible setting, 0, which disables the sending of ACL indications in the ISUP release message.
Table 3-18 shows how the MaxACL settings map the MCL values to the ANSI and ITU congestion
standards.
Note Disabling the MaxACL parameter (setting it to 0) does not disable the ACC functionality. If the MaxACL
parameter is set to 0 and the Cisco PGW 2200 Softswitch becomes congested, the percentage of calls
that is specified for that overload level is released. In this case, the associated ISUP release message does
not contain an ACL indication. The ISUP release message still indicates the proper clear cause.
Note You can use the Cisco VSPT to map the MCL to the congestion standard used by the adjacent signaling
points. For more information on using the Cisco VSPT, see Cisco Voice Services Provisioning Tool User
Guide.
To map the MCL to the appropriate congestion standard for the associated signaling point, perform the
following steps:
Step 1 Start a provisioning session, as described in the “Starting a Provisioning Session” section on page 3-64.
Step 2 Enter the following command to set the property that maps the MCL to the congestion standard used by
the adjacent signaling point:
prov-ed: component :name=" comp_name ",MaxACL= num
Where:
• component—MML component type name for the SS7 signaling path or trunk group properties.
Depending on the type of system, enter one of the following:
– sigsvcprop—Component type for signaling path properties, used to map MCL for systems that
are configured for signaling.
– trnkgrprop—Component type for trunk group properties, used to map MCL for systems that are
configured for call control.
• comp_name—MML name for the SS7 signaling path or trunk group for which you map the MCL to
the congestion standard used by the adjacent signaling point.
• num—Number that indicates how to map the MCL values. Table 3-18 lists the valid values for this
parameter and their associated congestion levels.