Caller: Telstra Fax Test Service

A test fax may have been sent to 1300 368 999 with your Calling Line ID. Once the fax is sent, it then calls you back with the calling line number (03) 8665 4900 and if a fax machine answers with that beeping tone you heard you will get test results faxed back.

It's just a fax test reply . When u send a fax to a test number this is the return fax test , someone has done a test fax and accidentally put your number as return

This number (03) 8665 4900 keeps calling me and I dont know where they are calling from! It is driving me nuts, please make it stop!

This number called me 5 times today and everytime I answered it there was a beeping noise in my ear.  When I tried calling it back a message came up saying "connection error".

I believe it's a fax response from the Telstra Fax Stream Test Number 1300 368 999).