A03608: CELL_SPT_A5_4_MS_NUM
This measurement provides the number of calls originated or terminated by MSs that process services in this cell and support A5/4.
Integer number or integer.
When the "A5/4" field in classmark 3 is set to "1", this measurement is triggered if any of the following situations occurs: the MS sends the classmark change message; the MSC sends the classmark update message; the incoming BSC handover is complete.
This is an original counter without involving any formula.