Alessandro Trebbi wrote to All:

AT> I have found a script that uses agetty and opens a telnet session when 
AT> modem connects, but there's no agetty in macOS (only getty, agetty should 
AT> be an extension of getty)

I haven't had a physical modem for 20 or so years but when I did I used
mgetty on linux. Do you see anything like that for your OS?

 Ttyl :-),
         Al

... At a store: In God we trust; all others pay cash.

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