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Had yet another #robocall #scamcall on my #AAISP SIP line this morning. I've fallen down a rabbit hole: how can I block these calls?
The spectrogram is very distinctive. Call pickup is followed by an unnaturally low noise level for a couple of seconds.
Then there's a blip.
Then the noise level rockets.
ALT
ALT
@philpem If its a SIP line, run a local PBX and route it through that, then use a geographic IP allocation database to get the block that address belongs to and add it to your iptables (much more effective than blocking indivudual addresses).
@RavenLuni Sadly I'm fairly sure they're not coming in over IP. Sadly @aaisp don't seem to offer many call-blocking features, I'm having to do it on Asterisk.