Lenny's history and why he isn't Creative Commons (2017)
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https://soundcloud.com/user-237714155/sales-call-abyss
I downloaded this and converted it to an appropriate wav format/bitrate for use with asterisk and a g.711 incoming SIP trunk, it's extension 666 on my voip system. Easy to transfer.
Google is your friend for other alternatives.
Worked like a charm.
No need to put out any information that allows him to be identified there.
If just a few percent of callers used services like this, or wasted a few minutes time of the telemarketers, mass spoofed calls wouldn't be a viable business strategy.
I would suggest to Lenny that he get a lawyer himself to register the copyright to the law firm on his behalf, and have the firm license under CC. But that would cost money. I don't know how much. And I don't know if Lenny would think it's worth the effort.
I hope this has helped answer your question.