Hi Liran,
the problem u are facing it is a well known issue of FreeRADIUS. SQL module is missing the Accounting-Type=15, so nothing related to OpenSER, therefore nothing to be fixed here. A sollution would be using the patch provided with the distribution of CDRTool, or directly get it from their site: http://www.ag-projects.com/index.php?option=com_weblinks&catid=66&It... (link name "Freeradius patch for OpenSER accounting").
Hope it helps, DanB