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Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner

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On 2026-06-11 23:32, Theo wrote:
> VanguardLH <V@nguard.lh> wrote:
>> "Carlos E.R." <robin_listas@es.invalid> wrote:
>>> Translated with DeepL.com (free version)
>>
>> So the non-spoofed caller makes their call, and then has to respond to a
>> text message?  Oh joy, 2FA comes to voice calls, too.
> 
> I was assuming that it's making an automatic handshake with the calling
> phone via RCS, not asking the caller to do it.
> 
> ie:
> 1. Recipient phone app receives a call from +34567890123
> 
> 2. Recipient phone app sends an RCS to +34567890123 saying 'hello RCS client,
> I'm +34xxxxxxxxx, are you calling me?'
> 
> 3. Sending phone RCS app sends an RCS back saying 'yes, I'm currently calling
> you now' or 'no, I'm not calling you right now'

Ah, automated. I thought it was the user typing. Now it makes sense. So 
they are doing a handshake without having a protocol designed for this. 
Mmm. Next step would be upgrading the entire network to do a handshake 
on all calls.

> 
> 4.  If recipient gets the 'yes' RCS they display a green tick, if they get a
> 'no' they display a 'suspicious incoming call' message and maybe block it.
> If they don't get an answer they don't display anything.
> 
> That could be done automatically without the sender having to do anything.
> 
> If someone is spoofing numbers they aren't receiving messages on them, so
> the RCS will go to the genuine number owner, rather than the one doing the
> spoofing.
> 
> The trouble is that calls from iPhones or from businesses won't operate
> this system, so it doesn't actually help very much.  And even if iPhones do
> adopt it, it seems unlikely that businesses will, since business telecoms is
> mostly SIP based and has nothing to do with RCS.
> 
> Theo


-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-10 11:44 +0200
  Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Jörg Lorenz <hugybear@gmx.net> - 2026-06-10 17:59 +0200
  Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-10 14:29 -0500
    Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-10 23:19 +0200
    Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Theo <theom+news@chiark.greenend.org.uk> - 2026-06-11 22:32 +0100
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-11 20:18 -0500
        Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-12 12:16 +0200
          Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-12 15:13 -0500
            Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Andy Burns <usenet@andyburns.uk> - 2026-06-13 08:29 +0100
              Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-13 15:52 -0500
                Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Jörg Lorenz <hugybear@gmx.net> - 2026-06-14 07:35 +0200
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Jörg Lorenz <hugybear@gmx.net> - 2026-06-12 07:19 +0200
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-12 12:19 +0200
        Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-12 15:59 -0500
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Theo <theom+news@chiark.greenend.org.uk> - 2026-06-12 23:11 +0100
        Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E. R." <robin_listas@es.invalid> - 2026-06-14 15:05 +0200
          Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-14 20:18 -0500
            Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E. R." <robin_listas@es.invalid> - 2026-06-15 09:24 +0200
              Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-15 08:14 -0500
                Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Theo <theom+news@chiark.greenend.org.uk> - 2026-06-15 16:29 +0100
                Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E. R." <robin_listas@es.invalid> - 2026-06-15 21:21 +0200

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