[stoic]

I once was able to confirm (with reasonable certainty) that the caller was using Twilio, because the message they left was a verbatim text from a Twilio example[1] for detecting whether a human answered:

"You did not reveal yourself to be human. Goodbye!"

Since then I've filed Twilio alongside Cogent in the "doesn't ask too many questions about who uses its services and for what" category.

[1] https://www.twilio.com/blog/2016/02/tracking-call-status-how...