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RE: Switching System 7 (SS7) Security flaws
I know about SDR, they are used in OpenBTS, an open source system used with Asterisk PBX systems. in 2013 Burning man, someone setup a cell phone tower for people to use SMS messaging, but with no SS7 access, all they can do is send messages.
Yeah I kinda figured you would know about them. :) But the guy I was responding to was looking for a good place to start so I was giving him some search terms.