With current master, event_route [xhttp:request] is not run. Instead error message shows up:
Oct 14 20:00:48 lohi /usr/bin/sip-proxy[8820]: ERROR: <core> [core/receive.c:356]: receive_msg(): no via found in request
After spending one hour in trying to figure out, what is wrong in my config, I build K using 5.4 instead of master and the problem disappeared.
So I suspect something is broken in master.
-- Juha