Memory and CPU Overload Protection
The Oracle Communications Core Session Manager protects itself from memory (heap) and CPU overload using configurable limits for their usage.
If the CPU usage exceeds the configured setting, the system sends a 503 error in response to any initial dialog request or standalone transactions. There are two memory (heap) related thresholds, the first of which generates 5xx replies, the second of which drops all messages.
This is true regardless of whether the system is performing SLRM or S-CSCF functions.