Event-Trigger  AVP ( 1006 )

When the Event-Trigger is sent from the PCRF to the PCEF, the Event-Trigger AVP indicates an event that shall cause a re-request of PCC rules. When the Event-Trigger is sent from the PCEF to the PCRF, the Event-Trigger AVP indicates that the corresponding event has occurred at the gateway.

Reference: 3GPP TS 29.212-f60   View