10 hour voicemail

What the hell is this?
648 minutes, constantly repeating.

Quite a distinctive audio pattern.

Any clues?


  1. Replies
    1. London number calling one of our London numbers...

  2. Sounds rather like a pearl/blue box configured to walk through all possible DTMF frequency ranges, looking for something exploitable.

  3. Sounds like a blue/pearl box, potentially, configured to walk through all possible DTMF combos to scan for vulnerabilities in PSTN systems...

  4. When the tone stops, it means the nukes have gone off.

  5. I got something that sounds like that once when I'd messed up the config on an isdn trunk. Too long ago to remember the specifics but I do remember the sound


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