rt_sigaction(SIGALRM, {sa_handler=0x420090, sa_mask=[ALRM], sa_flags=SA_RESTART}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
setitimer(ITIMER_REAL, {it_interval={tv_sec=0, tv_usec=0}, it_value={tv_sec=60, tv_usec=0}}, {it_interval={tv_sec=0, tv_usec=0}, it_value={tv_sec=0, tv_usec=0}}) = 0
wait4(-1, NULL, 0, NULL)                = -1 ECHILD (No child processes)
rt_sigaction(SIGALRM, {sa_handler=0x4200b0, sa_mask=[ALRM], sa_flags=SA_RESTART}, {sa_handler=0x420090, sa_mask=[ALRM], sa_flags=SA_RESTART}, 8) = 0
newfstatat(AT_FDCWD, "/var/run/kamailio/kamailio_rpc.fifo", 0xffffc50c4a90, 0) = -1 EACCES (Permission denied)
getpid()                                = 1577871
write(2, " 0(1577871) ERROR: jsonrpcs [jso"..., 111 0(1577871) ERROR: jsonrpcs [jsonrpcs_fifo.c:599]: jsonrpc_fifo_destroy(): FIFO stat failed: Permission denied
) = 111
newfstatat(AT_FDCWD, "kamailio_rpc.sock", 0xffffc50c4a90, 0) = -1 ENOENT (No such file or directory)
getpid()                                = 1577871

Stated using command

strace kamailio -D -E

Here is 

/var/run/kamailio/kamailio_rpc.fifo need to check