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Signalling system 7 has no authentication. That's the bottom line. Adding authentication is pretty obviously not trivial, not just because of protocol upgrade
by cryptonector 5y ago
Signalling system 7 has no authentication.
That's the bottom line.
Adding authentication is pretty obviously not trivial, not just because of protocol upgrade issues, but also because end-to-end authen. won't be easy to add at all, and hop-by-hop authen. w/ something like "egress filtering" won't work in the age of phone number portability.
What might work is a TCP-like return routability test. I.e., have the network ask the ostensible device "did you mean to make this call?", though that might have other issues (think of how SYN spoofing can be used for DDoS attacks).
I.e., preventing caller ID scams is really hard.
- bigmattystyles 5y agoWhat about charging a penny or 5cents per call? Nominally cheap for regular users, would put a dent in scammers. And don’t let the phone company keep the money, put it towards the infrastructure.
- cryptonector 5y agoBilling is one of the highest costs for telcos.
- contingencies 5y agoHere in China they aggressively egress filter since ~15 years ago (source: had an E1 on fiber way back then). You can set caller ID to any number you are assigned and nothing else.
- cryptonector 5y agoYes, this would work. It would have to be implemented in a lot of telcos. It would take time to get it all deployed, but there's no better time for this than today.