Radius Accounting Attributes listed below can be used to compare with the user access logs to retrieve the value of the number of bytes send and received in a specific session of the user.
Acct-Input-Packets
Indicates how many packets have been received from the port during the session provided to a Framed User.
Acct-Output-Packets
Indicates how many packets have been sent to the port during this session to a Framed User.
Acct-Input-Octets
Indicates how many octets have been received from the port over the course of this service being provided.
Acct-Output-Octets
Indicates how many octets have been sent to the port in the course of delivering this service.
For Example, you can refer to the screenshot below, the user access logs which shows the number of bytes sent and received in a specific session.
Below screenshot you can see that number of bytes sent and received are same as the Acct-input-packet and Acct-output-packet values in the Radius Accounting Attributes.