Structure about the overstay detection parameters.
struct{ NET_VCA_POLYGON struRegion; WORD wDuration; BYTE byRes[6]; }NET_VCA_RETENTION, *LPNET_VCA_RETENTION;
Area range, refer to the structure NET_VCA_POLYGON for details.
Time threshold for triggering overstay alarms, it is between 60 and 3600, the default value is 1800, unit: second.
Reserved.