A PDSN (18) includes a usage recording agent (19) for distinguishing
between nonbillable and billable activity of a subscriber device 12. The
usage recording agent (19) creates a record of a total number of bytes
transmitted from the PDSN (18) to the RAN (14), counts bytes that are
retransmitted from the PDSN (18) for providing a retransmitted byte
total, and forwards the retransmitted byte total and the record to an AAA
(28) so that the record can be adjusted in accordance with the
retransmitted byte total.