EFH triggers

For EFH to become active, the Credit Control Failure Handling (CCFH) value must be set to CONTINUE.

For a new session, the CCFH value is set in the configuration:

configure
    subscriber-mgmt
        diameter-application-policy <application-policy-name> [create]
            on-failure [failover {enabled|disabled}] handling continue

For ongoing sessions, the CCFH value is determined from the configuration or can be overridden by the OCS by including the following AVP in an answer message (CCA-I or CCA-U):

[427] Credit-Control-Failure-Handling AVP = CONTINUE (1)

EFH is triggered when the CCFH value is set to CONTINUE and one of the following conditions occurs:

• transmit failure

  failure to send a CCR-I or CCR-U message

  Figure: EFH trigger: transmit failure shows an example of a transmit failure.

  Figure: EFH trigger: transmit failure

  

• timeout

  failure to receive an answer (CCA-I or CCA-U) within the configured timeout

  Figure: EFH trigger: timeout shows an example of a timeout.

  Figure: EFH trigger: timeout

  

• protocol error

  failure because of a protocol error; seen as a Result-Code at command level in an answer message (CCA-I or CCA-U)

  Figure: EFH trigger: protocol error shows an example of a protocol error.

  Figure: EFH trigger: protocol error

  

• failure

  reception of unknown Result-Code values in a Credit Control Answer message. Table: Diameter Gy known transient and permanent failures result-code values lists the known Transient and Permanent Failures Result-Code values.

  Table: Diameter Gy known transient and permanent failures result-code values

  Result code		Command level		MCSCC level
  		CCA-I	CCA-U
  4001	DIAMETER_AUTHENTICATION_REJECTED	known	known	unknown
  4010	DIAMETER_END_USER_SERVICE_DENIED	unknown	known	known
  4011	DIAMETER_CREDIT_CONTROL_NOT_APPLICABLE	known	known	known
  4012	DIAMETER_CREDIT_LIMIT_REACHED	unknown	known	known
  5003	DIAMETER_AUTHORISATION_REJECTED	known	known	known
  5030	DIAMETER_USER_UNKNOWN	known	known	unknown
  5031	DIAMETER_RATING_FAILED	unknown	known	known

• a Diameter Gy message decoding error, for example (this is not an exhaustive list):

  • a missing Result-Code AVP

  • an unknown command code received

  • an incorrect session ID, origin host or origin realm in CCA

  • quota received for unexpected rating group

  • quota received with Result-Code 4012 (Credit Limit Reached)