3 ms·
That sounds wrong to me? Surely you could do something like ingress / egress filtering of the numbers, and not allow an American number from India, for instanc
by xen2xen1 6y ago
That sounds wrong to me? Surely you could do something like ingress / egress filtering of the numbers, and not allow an American number from India, for instance? Am I missing something in the setup.
I guess what you're really saying is that most phone systems are nowhere near that sophisticated?
- mjevans 6y agoNot my expert domain but; Roaming. How do you let someone with a cell phone make a call while on vacation half way around the world, without giving them most of a second of latency?
- LinuxBender 6y agoWhat you are saying totally makes sense, but numbers are portable as mjevans pointed out and b-number analysis is a bit more primitive. This requires cooperation from all the telcos and would require business changes, process changes and code changes to systems so that you could approve-list what is a mobile network NPA/NSX and deny-list what is not. This just means spoofers would only be spoofing mobile numbers. Now you have a game of whack-a-mole. Some of these systems are so old that the people that wrote code for them are long gone. I am not saying that is universally true of course. Some switches had fairly modern hardware. But unlike the internet where everything peers with bgp and information / routing information is freely shared, there is a lot more manual work and manual changes and coordination required. Even if you could update all of them, now you have to maintain yet another real time deny-list and that does not really solve spoofing.
- deleted 6y ago[deleted]