asterisk(8) on Linux
The text 082ed04461f7, as Debian 10 (Buster) shipped it.
All-purpose telephony server.
Flags it lists
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-c -
-d -
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-f -
-g -
-h -
-i -
-m -
-n -
-p -
-q -
-r -
-t -
-v -
-x