[VoiceOps] Fake Voicemail Anti-Robocall Tactics

[Paul Timmins]

I expect that people will attest spam. But we're allowed to block carriers by spid if we want if we start getting garbage. The effective telecom death penalty that'd create (along with the liability) will be an interesting enforcement mechanism.


________________________________
From: VoiceOps <voiceops-bounces at voiceops.org> on behalf of Nick Olsen <nick at 141networks.com>
Sent: Tuesday, February 16, 2021 1:27 PM
To: Karl Douthit
Cc: Voiceops.org
Subject: Re: [VoiceOps] Fake Voicemail Anti-Robocall Tactics

My faith in STIR/SHAKEN has all but collapsed. I think we're just going to end up in a situation where even the SPAM is attested. At least having a breadcrumb to follow might help.

Given the current state of SS. I won't hold my breath.

On Tue, Feb 16, 2021 at 12:44 PM Karl Douthit <karl at piratel.com<mailto:karl at piratel.com>> wrote:
Stir will only help if carriers actually pass or allow tokens.  Still waiting on several tier 1 carriers to take them.

On Tue, Feb 16, 2021 at 9:35 AM Glen Gerhard <glen at cognexus.net<mailto:glen at cognexus.net>> wrote:
Hopefully Stir/Shaken will make this a moot point. Calvin, are you saying that a 608 is the recommended response for a call that is being rejected due to S/S attestation or CVT reasons?

~Glen

On 2/16/2021 8:19 AM, Calvin Ellison wrote:
Today we received a notice from one of our underlying carriers that included the following statement:

* If a customer spoofs an ANI that they do not own, the clec's can forward to call to a voiceless Voicemail which appears to be FAS.

Is there any legal device that actually supports this practice? I'm looking for a specific statute, FCC rule, precedent in a judicial ruling, or the like.

The FCC has ruled that the SIP 608 response code is to be used for signaling when a call is rejected. I doubt the FCC or FTC has ruled that terminating carriers are permitted to cause loss of trust and revenue between upstream intermediate and originating carriers.


Regards,


Calvin Ellison
Systems Architect
calvin.ellison at voxox.com<mailto:calvin.ellison at voxox.com>
+1 (213) 285-0555

-----------------------------------------------
voxox.com<http://www.voxox.com/>
5825 Oberlin Drive, Suite 5
San Diego, CA 92121

[Voxox]



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Glen Gerhard
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Cognexus, LLC
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Karl Douthit

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