got a message from this number (02) 9737 4006, ive no idea who this is from

Caller: Junee gaol Inmate

This is the number for the Junee gaol.

Legit call.

I missed 3 calls from this number within 1 minute. No voice mail of any kind was left. When I attempted to call the number back, a computer sounding voiceover stated: "this is not an authorised number" followed by loud digital tones before it disconnected.

I only found out that it was the Junee Correctional Centre after I actually answered the call when the exact number was attempting to call me again. For some reason the telephone number is not anywhere close to the Junee area code.

If this number calls it could be EITHER an inmate or staff member (according to J.C.C.) from the Junee Correctional Centre. For some reason, it is not even close to being a Junee area code

I called back number (02) 9737 4006 reached voice mail but did not say for what company.