a little late but, here is the level 3 debug log....
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: tm [t_reply.c:1509]: DEBUG: cleanup_uac_timers: RETR/FR timers reset
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [xavp.c:365]: destroying xavp list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [usr_avp.c:644]: DEBUG:destroy_avp_list: destroying list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2387]: DEBUG: <core> [receive.c:291]: receive_msg: cleaning up
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [xavp.c:365]: destroying xavp list (nil)
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2388]: DEBUG: <core> [receive.c:291]: receive_msg: cleaning up
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: ERROR: *** cfgtrace: c=[/usr/local/etc/kamailio/kamailio.cfg] l=860 a=65 n=assign
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: ERROR: *** cfgtrace: c=[/usr/local/etc/kamailio/kamailio.cfg] l=861 a=26 n=exec_msg
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: : exec [../../parser/../ip_addr.h:688]: BUG: ip_addr2sbuf: unknown address family 0
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: <core> [md5utils.c:67]: DEBUG: MD5 calculated: 64d3de5c2447acd6006b8539d1246e10
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: exec [exec_hf.c:267]: SIP_HF_CONTENT_LENGTH=0
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: exec [exec_hf.c:267]: SIP_HF_CSEQ=1 OPTIONS
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: exec [exec_hf.c:267]: SIP_HF_CALLID=123
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: exec [exec_hf.c:267]: SIP_HF_TO=<
you@kamailio.org>
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: exec [exec_hf.c:267]: SIP_HF_FROM=<
you@kamailio.org>;tag=123
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: exec [exec_hf.c:267]: SIP_HF_VIA=SIP/2.0/UDP 127.0.0.1
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: exec [exec_mod.c:175]: executing [nc -u -w0 10.2.0.54 514 <<< ",denied_calls-0,dos-green"]
Jan 18 07:36:23 kamailiolabroute /usr/local/sbin/kamailio[2401]: DEBUG: <core> [main.c:852]: SIGCHLD received: we do not worry about grand-children
Jan 18 07:36:25 kamailiolabroute /usr/local/sbin/kamailio[2390]: DEBUG: tm [t_reply.c:1168]: ->>>>>>>>> T_code=0, new_code=408
Jan 18 07:36:25 kamailiolabroute /usr/local/sbin/kamailio[2390]: DEBUG: tm [t_reply.c:1931]: DEBUG: local_reply: branch=0, save=0, winner=0
Jan 18 07:36:25 kamailiolabroute /usr/local/sbin/kamailio[2390]: DEBUG: tm [t_reply.c:1968]: DEBUG: local transaction completed
Jan 18 07:36:25 kamailiolabroute /usr/local/sbin/kamailio[2390]: DEBUG: tm [t_hooks.c:288]: DBG: trans=0xb00a772c, callback type 256, id 0 entered
Jan 18 07:36:25 kamailiolabroute /usr/local/sbin/kamailio[2390]: DEBUG: dispatcher [dispatch.c:2345]: OPTIONS-Request was finished with code 408 (to
sip:10.10.21.26, group 47)