nixamp streams have a phone number. Call +1 408-357-2326, key a six digit code, and if that code belongs to a live stream you hear the stream. That was the idea. What actually happened was that you heard a friendly voice say "here it is" and then nothing at all, for as long as you cared to hold, at your own expense.
The bug is a good one, so here it is.
A nixamp that lists itself in the directory announces a listen link. That link looks like https://host/s/<key>. It is not a file. It is a 302 that sets a cookie and redirects a browser to the player page, which is exactly right for a person and exactly wrong for everything else.
The phone line handed that link to Telnyx to play into the call. Telnyx fetches an audio URL once, anonymously, with no cookie jar. So it followed the redirect, arrived with no cookie, and got this:
HTTP/1.1 401
