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GCL Rejects Incoming Calls With Cause Value 42 (Switching Equipment Congestion)


A Dialogic® IMG Integrated Media Gateway may reject incoming calls with a clearing cause value # 42 (switching equipment congestion. The IMG Call tracing log shows that the IMG GCL software component sent a Clear Response with cause value of 42. This happens only during periods of high traffic.
07:42:30.886 CALL(GCL) (00:00000:00) SENT Clear Response, cause=42 to L4
07:42:30.886 CALL(SIP) (00:58132:00) Reason Hdr: "Switching equipment congestion"

Reason for the issue:

Cause value 42 (Switching equipment congestion) indicates that the switching equipment generating this cause is experiencing a period of high traffic.
The IMG GCL software component checks the current IMG CPU busy percentage, and will reject calls when IMG CPU exceeds the 85% busy limit.

Steps to check the GCL statistics of CPU overload:
- Telnet to the IMG 1004 / IMG 1010, or ssh to the IMG 2020
- Type d to enter the Advanced Menu, log in with admin / password
- Type G to enter into GCL Diagnostics
- Type C to "Display stats of CPU overload"
gcl> C

GCL CPU Overload Stats
CPU[85] calls rejected=37
Total Calls: 37

The GCL CPU overload statistics here show that GCL rejected 37 calls as CPU exceeded the 85% busy limit.
Product List
Dialogic® IMG 1004 Integrated Media Gateway
Dialogic® IMG 1010 Integrated Media Gateway
Dialogic® IMG 2020 Integrated Media Gateway (IMG 2020), formerly referred to as Dialogic® BorderNet™ 2020 Session Border Controller

Glossary of Acronyms / Terms

GCL - Gateway Control Layer

Related Documentation

ITU-T Recommendation Q.850 (1998), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN User Part.


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First published: 22-Dec-2009
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