The system does a 24 Hour Restart to clean out the buffers and any overflows/overruns CRON generate backup and these are checked by the Sysop for issues in Callsigns and Radio ID numbers and RadioID's that do not match Callsigns and IP’s and login locations are captured.
The VKDMR server is a closes application. The source is not shared.
The IPSC source code is proprietery. It'sa development has been forked many times and is modified and re-comfigured by many server admins. There is a connection from Motorola's Mototrbo Server to IPSC to ISPC to UPSC2. They are all inovations of bridging (inter-server-communications) applicartions that attempt to comply with the DMR ETSI II standard.
My understanding is that the VKDMR is a linux server based upon DMR+ IPSC2 by DG1HT DL5DI and OE1KBC.
A Early 2015 specification:
Some simplar source: