A computer-implemented method of monitoring a radio access network (RAN) is provided. The method includes receiving access stratum data that is a function of cell trace records (CTRs) associated with wireless communication transported to or from one or more cells of the RAN, wherein the CTRs are obtained at a granularity sufficient to detect one or more events, the events defining a segment or occurring during a segment, wherein a segment is defined by the beginning, end, or any handovers of a call included in the wireless communication. The method further includes detecting in the access stratum data one or more state transitions as indicated by the events and outputting an enhanced session record (ESR) including information processed from the access stratum data associated with the respective one or more detected state transitions.