+ 'sum_duration' => {
+ 'name' => 'Summary (one line per service, with duration)',
+ 'invoice_header' => 'Caller,Calls,Minutes,Price',
+ },
+ 'sum_count' => {
+ 'name' => 'Summary (one line per service, with count)',
+ 'invoice_header' => 'Caller,Messages,Price',
+ },