sngrep(8) on Linux
The text e4c77c5fbbbd, as Debian 11 (Bullseye) shipped it.
SIP Messages flow viewer
Flags it lists
-
-B -
-H -
-I -
-L -
-N -
-O -
-R -
-V -
-c -
-d -
-h -
-i -
-k -
-l -
-q -
-v