MITM On PSTN: Novel Methods For Intercepting Phone Calls
summary
Combines Caller ID spoofing, SIP trunks and a VoIP gateway with simultaneous ring interception to record both sides by calling A as B and B as A, patching audio via JACK and saving both streams; demonstrates a second method using SS7-based call divert (and ENUM/DNS tampering) to redirect a real incoming call to a VoIP endpoint, cancel and re-establish the divert, then tap and forward the audio. Works remotely worldwide against PSTN/mobile networks; demos and schematics show it reliably records and can inject or delay audio.
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chapters (9)
- 0:00Introduction and background
- 2:00PSTN and caller ID systems
- 4:22Understanding call components
- 8:32Signaling system 7 and mobile
- 13:04Simultaneous ring attack
- 17:24Diversion and redirection
- 21:11ENUM and DNS-based attacks
- 25:02Alteration of phone calls
- 27:14Proposed solutions
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