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4.2 AF Procedures
4.2.1 Provision of Service Information at session establishment
When a new AF session is being established and media information for this AF session is available at the AF, the AF shall send the corresponding Service Information to the PCRF by sending the AA-Request message. The AF shall include the corresponding Media-Component-Description AVP(s) into the message. The AF may also include the AF-Charging-Identifier AVP into the message for the charging correlation purposes. The AF may also include the Specific-Action AVP to request notification for certain bearer events, e.g., IP flow termination or IP flow establishment. To allow the CRF to match the described service IP flows in an unambiguous manner with TFT filter information, the AF should supply both source and destination IP addresses and port numbers within the Flow-Description AVP, if such information is available.
The behaviour when the AF does not receive the AAA, or when it arrives after t

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