Using Kamailio 4.0.0 with a minimal configuration, trying to get some logging to help me understand the system, I can get static log messages easily enough with log, but now want something more useful.
DEBUG: <core> [sr_module.c:935]: DEBUG: init_mod: xlog
DEBUG: <core> [main.c:2539]: Expect (at least) 13 SER processes in your process list
DEBUG: <core> [route.c:927]: fixing xdbg()
DEBUG: <core> [pvapi.c:390]: PV <$rm> is not in cache
DEBUG: <core> [pvapi.c:269]: PV cache not initialized, doing it now
ERROR: <core> [pvapi.c:761]: error searching pvar "rm"
ERROR: <core> [pvapi.c:965]: wrong char [m/109] in [$rm] at [2 (0)]
ERROR: xlog [xlog.c:363]: wrong format[SIP Request: method [$rm] from [$fu] to [$tu]#012]
Dave.