Hi, Kamailio server is raising an internal error when recieves an "INVITE" request. I've increased the debug level value in kamailio config file but I cannot get further information. Some times it works with exactly the same configuration so I can't figure out what is wrong.
I attached below the few lines related with the internal error among the huge debug messages:

DEBUG: tm [t_hooks.c:288]: run_trans_callbacks_internal(): DBG: trans=0x7fe070bedb68, callback type 2, id 0 entered
12(13521) DEBUG: acc [acc_logic.c:644]: tmcb_func(): acc callback called for t(0x7fe070bedb68) event type 2, reply code 500
12(13521) DEBUG: tm [t_lookup.c:1141]: t_check_msg(): DEBUG: t_check_msg: msg id=12 global id=12 T end=0x7fe070bedb68
12(13521) DEBUG: tm [t_reply.c:2217]: reply_received(): DEBUG: reply_received: org. status uas=180, uac[0]=100 local=0 is_invite=1)
12(13521) DEBUG: <core> [mem/f_malloc.c:432]: fm_malloc(): fm_malloc(0x7fe070970000, 1423) called from tm: t_msgbuilder.c: build_local_reparse(369)
12(13521) DEBUG: <core> [mem/f_malloc.c:507]: fm_malloc(): fm_malloc(0x7fe070970000, 1424) returns address 0x7fe070c02c28
12(13521) DEBUG: <core> [mem/f_malloc.c:576]: fm_free(): fm_free(0x7fe070970000, 0x7fe070c02c28), called from tm: t_reply.c: reply_received(2271)
12(13521) DEBUG: <core> [mem/f_malloc.c:595]: fm_free(): fm_free: freeing block alloc'ed from tm: t_msgbuilder.c: build_local_reparse(369)
12(13521) DEBUG: <script>: incoming reply
12(13521) DEBUG: tm [t_reply.c:1311]: t_should_relay_response(): ->>>>>>>>> T_code=180, new_code=500
12(13521) DEBUG: tm [t_reply.c:1829]: relay_reply(): DEBUG: relay_reply: branch=0, save=1, relay=-1 icode=0

( ... )

 DEBUG: <core> [parser/msg_parser.c:633]: parse_msg(): SIP Reply  (status):
12(13521) DEBUG: <core> [parser/msg_parser.c:635]: parse_msg():  version: <SIP/2.0>
12(13521) DEBUG: <core> [parser/msg_parser.c:637]: parse_msg():  status:  <500>
12(13521) DEBUG: <core> [parser/msg_parser.c:639]: parse_msg():  reason:  <Internal Server Error>


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