This is a number from an Optus call centre. You can't ring it back as it won't be answered (outgoing calls only).

Thanks for the warning I had this number call me didnt answer it

I have had multiple calls as well, I think it is a Melbourne based Optus business direct outlet trying to drum up business, the fact u get 4 calls within a ten minute block borders on harassment

Same experience as other commenters. I have added to my 'ignore' list.

Just missed the call so I rang the number back and it is constantly engaged. I save all these telemarketers numbers ( I have listed this as optus con ) so when they ring they are identified and they do not answer.

Also had a call engaged when I tried to return the cal, having read this I wont be answering Im not even an optus customer !

Rude, invasive, definitely claims to be from Optus. Hang up!

I recently add an ap called iblacklist to my iPhone to block callers like this... You need a jailbroken iPhone to add the app, but well worth it.

it appears to be optus

Either number is busy, or ring out! Annoying

got 5 missed calls from it in the space of 10 minutes, tried calling back numerous times, only for it to be either engaged, or ring out (once ringing out about 10sec after it was engaged)

I keep getting texts from this number saying I have a missed call when my phone hasn't rung at all.Needless to say I won't be ringing back!

You can email them at admin @ cmaust.net.au

...just had a missed call from this no (03) 9221 0238)
some of the previous comments suggest it's bogus
but one suggests it is optus,

any clarification available?

I had a missed call from this number today and, after reading this forum, I rang Optus to find out whether it was one of theirs. I was told that it wasn't an Optus number as that particular branch (sales/upgrades) are based in Adelaide.I think it's dodgy - I'll be watching for the number to come up again so I can get more info

How rude.

An Optus 'sales' centre outsourced to India. They will be very aggressive in trying to sign you up as they work on commission! I would avoid as you can get better deals in store.