[AusNOG] "Telstra" scammers

Tim Dooley tim.dooley at outlook.com
Thu Feb 18 21:50:55 EST 2021

While telecom companies such as Telstra are required to limit outbound calls from their SIP Trunks (ensuring you own the number you're trying to present), there are "IT" companies which offer SIP trunks without being a telco, this means they do not have to follow the same guidelines.

Just 2 days ago I became aware of a scammer presenting a school's main number on outbound calls, being part of the team supporting the schools phone system I can guarantee the system wasn't hacked at all.
There was no traffic from the school's phone system to Telstra during the time of the scam calls, however plenty of angry people were calling back yelling at the admin staff.

so basically yes, a VoIP seller (yet not an official telco) putting zero security on the calling number.


From: AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Darren Moss <Darren.Moss at cloud365.com.au>
Sent: Thursday, 18 February 2021 3:45 PM
To: Bradley Amm <brad at bradleyamm.com>; AusNOG Mailing List <ausnog at ausnog.net>
Subject: Re: [AusNOG] "Telstra" scammers

How are they making calls into AU mobile networks ?

Surely they need a SIP service as a starting point.

Is it a VoIP seller not performing checks ??


From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Bradley Amm
Sent: Thursday, 18 February 2021 3:42 PM
To: ausnog at ausnog.net
Subject: Re: [AusNOG] "Telstra" scammers

Unfortunately not a lot can be done

I had a similar call today. Just blocked the numbers.

Probably a spoofed number as well

From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of Kai
Sent: Thursday, 18 February 2021 12:34 PM
To: ausnog at ausnog.net
Subject: [AusNOG] "Telstra" scammers

Just had a scam call from a female operator, called from "0432 594 523<tel:0432%20594%20523>" (probably a spoofed number), says her name is Selina from Telstra, that my modem has a virus. She gave her Telstra staff ID as C0527 (that's not a real Telstra staff ID, it starts with a 0 and it's too short) and hung up when I asked what her Team Leader or Manager's name and staff ID is.

So the "Telstra scammers" are still out there, trying to scam people.

Sent from my smartphone.
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