It is weird that it hints at good vs. bad in inband vs. out of band signaling, but it doesn't talk about security, it is mostly concerned with maintaining good speech quality, and what kinds of tones are appropriate given the other line conditions...
I'm not sure why this is on HN, these have been available for years. I'll admit, I like the reminder, because last I checked AL had mothballed the server, and no one noticed for months. Someone (perhaps me?) needs to scrape these and store them some place when the inevitable happens, and AL stops hosting them for good.
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http://www.alcatel-lucent.com/bstj/vol39-1960/articles/bstj3...