According to a defcon talk, spammers just make sure all their spam gets routed through legacy TDM systems which discard the shaken/stir header because they're too old to support it. The other side then re-adds a "we got this from somewhere that didn't support this header" header.
> legacy TDM systems
Easy fix. It should be opt-in to accept a call that is routed through one of these. I know they allow it so some grandma in rural France that still uses a dial phone on a copper line that hasn't been touched since 1962 can call her son in New York, but for the rest of us who are not in that situation, we can just blacklist all those calls and lose nothing. This would even fix spam for the people who opt-in, because so few people have grandmas in rural France that it's not worth it for the spammers to bother anymore.
It is opt/in. There's three categories (according to that defcon talk): call originates from the number it says it does, call originates from our network but we're not sure about the number, and call came to us unverified (only allowed by regulation on legacy links).
Now, operators of those legacy links make A LOT of money for operating them since they carry 100% of the country's spam traffic, and they're not going to shut them down just because you think they should. The government would have to make them do it and they'll pretend upgrading is super expensive.
> call originates from our network but we're not sure about the number, and call came to us unverified
These two categories should be denied by default by my telecom provider, and the user must opt-in to receiving them.
> Now, operators of those legacy links make A LOT of money for operating them since they carry 100% of the country's spam traffic, and they're not going to shut them down just because you think they should.
Those operators are not my concern, they can do whatever they want. I want my telecom provider to block unknown/unverified calls by default. I have no reason to ever receive a call from an unverified source. Some people might, because they have business or relatives or whatever in such a region, and they can opt-in to receiving them if so.
Sure, but why do I care? Let them run the legacy links. Just don't make my phone ring.
> Easy fix. It should be opt-in to accept a call that is routed through one of these.
Easier (and correct) fix: Telecoms operators should not be permitted to provide transit to a call that's routed through one of these.
> I know they allow it so some grandma in rural France that still uses a dial phone on a copper line that hasn't been touched since 1962...
This doesn't make sense. Even my inexpensive Mikrotik switches can augment packets with the ID of the port that they originated from. I do not believe for even a second that Telecoms Grade switching equipment is unable to do the same. The fact that that grandma can send and receive calls tells you that both that that equipment exists and that it knows what port her phone is connected to.
> I do not believe for even a second that Telecoms Grade switching equipment is unable to do the same
Mikrotik is a young spring chick compared to the dinosaurs in telecom.
> I do not believe for even a second that Telecoms Grade switching equipment is unable to do the same.
The example should rather have been some telecom carrier in Africa or India. Telco equipment is expensive, the technology is ridiculously complex and getting companies especially in less well-off regions to replace aging stuff and updating it to modern standards is next to impossible. Think about it, the globally connected phone system includes countries where you get 10 GBit/s symmetric fiber in your home and it includes countries where people don't even have running water because they're so poor.
The fact that we in Western countries can have a realtime conversation with someone in the Saharan desert or in an Indian village that requires days worth of travel [1] is nothing short of a miracle.
[1] https://www.aljazeera.com/gallery/2024/5/8/an-election-booth...
I am, more in tune with "just get it over with" than ever. Ipv6? 25 years of this crap? should have just said, Jan 1 2001, all routers must support 64 bit ipv4 addresses. Like the chrome HTTPS switch over, JUST DO IT
You mean 128 bit? That's called ipv6. It's ipv4 with 128 bit addresses.