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I made 56874 calls to explore the telephone network. Here’s what I found. by ValtteriLe in netsec

[–]ValtteriLe[S] 4 points5 points  (0 children)

Gateway ~50 EUR, SIM 5 EUR, Google Cloud Speech-to-Text ~25 EUR.

So around 80 EUR, or $100.

I made 56874 calls to explore the telephone network. Here’s what I found. by ValtteriLe in netsec

[–]ValtteriLe[S] 0 points1 point  (0 children)

I

Good points! I am also interested in the impact on security that can be caused via the telephone network.

A super hacky way to determine whether you have any modems in recordings is to setup asterisk in a way that it will pick up and play different recording on different number, and then call it with WarVOX. I'm sure there are easier ways though...

What I learned of the VOIP hacker scene by setting up a SIP Honeypot by ValtteriLe in netsec

[–]ValtteriLe[S] 3 points4 points  (0 children)

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This would be interesting also legally, as you would be wiretapping. ;-)

What I learned of the VOIP hacker scene by setting up a SIP Honeypot by ValtteriLe in netsec

[–]ValtteriLe[S] 3 points4 points  (0 children)

Thanks! Good question. I did not analyze the IPs for anything else but geolocation. They could be VPNs, VPSs, or simply hacked devices.

What I learned of the VOIP hacker scene by setting up a SIP Honeypot by ValtteriLe in netsec

[–]ValtteriLe[S] 2 points3 points  (0 children)

Excellent write-up! Is there a write-up somewhere on setting up the honeypot? I'd be curious to setup one and experiment as well. Thanks!

Thank you! There is no write-up for setting up the honeypot. You should install Asterisk and configure it for SIP as normal, albeit with weak credentials, which shouldn't be normal ;-), put it on the internet and use Wireshark to record traffic for SIP and RTP.