For Aussies looking for an NBN "SOS/ROC" compatible (*) xDSL firmware, the version required is 5.7.C.8.1.7_5.7.5.A.1.1 from the Vigor 130 "modem 11" package - see https://github.com/xdarklight/lantiq-xdsl-firmware-info/issues/34 for more info about getting it.
(*) The VRX200 chipset isn't technically SOS/ROC compliant, however it can be sufficiently compliant for NBN's purposes if SRA works properly when the NBN FTTN/FTTB node is configured for SOS/ROC. Unfortunately most Lantiq xDSL blob versions lose downstream SRA in this environment unless the service is put onto a "Stability profile", which deactivates the SOS/ROC configuration and after 3-7 days moves the service to Dynamic Line Management (DLM). The 5.7.C.8.1.7_5.7.5.A.1.1 xDSL version has been confirmed to have bidirectional dynamic SRA on an SOS/ROC enabled connection.