While this doesn't answer the question regarding the call origin, I 
heartily endorse the Jolly Roger Telephone Company 
<https://jollyrogertelephone.com/>. This is a voicemail service that uses 
AI bots to humorously carry on conversations with scammers and 
telemarketers, making them think they are talking to real people.
Whitelisted users from your contacts just get standard voicemail.
Numbers that you blacklist go straight to the bots.
Numbers blacklisted by enough other community users automatically get sent 
straight to the bots.
Numbers calling from auto-dialers get prompted to press 1 to prove they are 
human to potentially avoid a bot.

I've also used a service from EveryCaller <https://www.everycaller.com/> to 
similarly filter calls and texts. This works more like a firewall for your 
phone. You can automatically block toll-free numbers and community 
blacklisted numbers. You can also set custom rules using number patterns. 

These two services work great in combination as numbers that are known to 
be suspicious don't even ring your phone. They just go straight to jolly 
roger.

On Sunday, February 11, 2024 at 5:40:01 PM UTC-6 mjbtn wrote:

> Just catching this thread, but at least in the VoIP realm (where a lot of 
> spoofed calls originate), there is some effort to combat this:
>
>  
>
> https://www.fcc.gov/call-authentication
>
>  
>
> I only know enough about this to point to it, though my two primary VoIP 
> providers claim to be working towards and/or are supporting it (as I 
> haven’t checked in this regard lately). 
>
>  
>
> How this translates to the cellphone enduser side is not at all clear to 
> me. But kind of like SPF (and maybe DKIM too) for email authentication, I 
> think this is what they’re trying to achieve.
>
>  
>
> FWIW
>
>  
>
> *From:* nlug...@googlegroups.com <nlug...@googlegroups.com> *On Behalf Of 
> *Kent Perrier
> *Sent:* Sunday, February 11, 2024 4:16 PM
> *To:* nlug...@googlegroups.com
> *Subject:* Re: [nlug] Capturing a phone call's true origin
>
>  
>
> If they are spoofing their origin number I don't know that even the 
> telephone company has the source in their records. Realtime connection 
> logging might have it.
>
>  
>
> I let the google assistant screen all unknown numbers so I never see 
> numbers not associated with names not in my contacts.Not really an option 
> if you don't have
>
> a Pixel. 
>
>  
>
> Kent
>
>  
>
> On Sat, Feb 10, 2024 at 8:56 PM John F. Eldredge <jo...@jfeldredge.com> 
> wrote:
>
> Does anyone know of a way for an Android phone to capture an incoming 
> call's true origin number, or is that information only available to the 
> phone company? In the last year, I have received about 1,000 calls (several 
> per day) where the caller hangs up as soon as I speak. At first, I assumed 
> it was a bot building up a list of answered numbers, but I am now starting 
> to suspect I am being deliberately harassed. I served for several years as 
> the newsletter editor for the Nashville Peace and Justice Center, a local 
> progressive organization, so any harassment could be politically motivated. 
>
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