asterisk(8) on Linux
The text cbbe41204cb0, as Debian 7 (Wheezy) shipped it.
All-purpose telephony server.
Flags it lists
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-B -
-C -
-F -
-G -
-I -
-L -
-M -
-R -
-T -
-U -
-V -
-W -
-X -
-c -
-d -
-e -
-f -
-g -
-h -
-i -
-m -
-n -
-p -
-q -
-r -
-t -
-v -
-x