Question: When a PCRF notifies an AF of the loss of resources associated with PCC/QoS Rules for AF Signalling IP Flows via a Re-Authorization Request (RAR) command, what Specific-Action AVP value is included in the RAR to indicate the loss of a non-GBR bearer (e.g., IMS signalling specific PCC rules)?
Option 1: INDICATION_OF_LOSS_OF_BEARER_RESOURCE
Option 2: INDICATION_OF_RELEASE_OF_GBR_BEARER
Option 3: The notification for loss is not sent for non-GBR bearers as per standardized QCI characteristics.
Option 4: INDICATION_OF_BEARER_MODIFICATION_REQUIRED
Explanation: According to standardized QCI (QoS Class Identifier) characteristics, IMS signalling specific PCC rules include a QCI corresponding to a non-GBR bearer. For such bearers, the 'INDICATION_OF_LOSS_OF_BEARER' will not be reported when resources are lost, making Option 3 correct. This highlights the nuanced handling of different bearer types in telecom networks, particularly how non-GBR bearers (like those used for IMS signalling) are treated differently in terms of loss notifications.