Sets how often, in seconds, SSG sends interim accounting records to the AAA server for ongoing sessions. This is the resolution of usage tracking: a short interval gives near-real-time usage visibility, useful for prepaid balance enforcement, at the cost of more RADIUS traffic and AAA load, while a long interval reduces that load but risks losing more unbilled usage data if SSG or AAA has an outage between records. A prepaid mobile operator that needs to cut off service the moment a subscriber's balance hits zero would set cssgCfgAccountingInterval to something like 60 seconds rather than a longer default, trading extra RADIUS chatter for tighter balance enforcement.