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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
A P P E N D I X
C
Overload Control
Revised: July 22, 2009, OL-8723-19
Overload Control Phases
Overload is a switch condition that exists when system resources cannot handle system tasks. Increases
in call traffic or messages indirectly related to call traffic usually cause overload (
).
The Overload Control feature supports the BTS Call Agent (CA) and Feature Server (FS). Overload
Control detects, controls, and manages overload from all types of networks (SIP, SS7, ISDN, MGCP,
H.323):
Table C-1
Overload Control Phases
Overload Control
Phase
Actions
1. Detection
Measures and compares factors to threshold values.
Determines system congestion and machine congestion level (MCL).
Detects BTS machine congestion conditions in 5 levels: none, mild, moderate,
severe, emergency.
2. Control
Decreases overload, this is configurable and varies with MCL but usually
means rejecting a percentage of incoming calls.
Caution
To control overload you must edit configuration files.
Changes to these files significantly impact system
performance. Edit them only under the direction of a
Cisco engineer.
3. Management
Affects the following switch areas:
•
Alarms
•
Logs
•
Billing
•
Measurements