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How to adjust fax transmission level on Konica Minolta MFD. According to Telstra, this is the cause of 85% of fax transmission problems in Australia. Simply send any fax to Telstra Test Fax Number 1300 368 999 (Australia) and you will receive a fax report back as a returned fax in a few minutes. NOTE: This tutorial is a bit technical, you need access to Service Mode to make this adjustment.