Some additional context:
(gdb) where #0 0x0000000000456751 in do_action (h=0x7ffd50a0bfe0, a=0xf0f0f0f0, msg=0x7ffa8511a850) at action.c:337 #1 0x000000000046a78c in run_actions (h=0x7ffd50a0bfe0, a=0xf0f0f0f0, msg=0x7ffa8511a850) at action.c:1549 #2 0x000000000046af11 in run_top_route (a=0xf0f0f0f0, msg=0x7ffa8511a850, c=0x0) at action.c:1635 #3 0x00007ffa8187b118 in route_exists (msg=0x7ffa8511a850, route=0x7ffa85029d20 "AUX_RTPENGINE_OFFER_INBOUND") at cfgutils.c:883 #4 0x000000000045e087 in do_action (h=0x7ffd50a10760, a=0x7ffa85038650, msg=0x7ffa8511a850) at action.c:1060 #5 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa85038650, msg=0x7ffa8511a850) at action.c:1549 #6 0x000000000045df6e in do_action (h=0x7ffd50a10760, a=0x7ffa85039410, msg=0x7ffa8511a850) at action.c:1045 #7 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa850266a0, msg=0x7ffa8511a850) at action.c:1549 #8 0x000000000045aa5a in do_action (h=0x7ffd50a10760, a=0x7ffa85024688, msg=0x7ffa8511a850) at action.c:678 #9 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa8501ca40, msg=0x7ffa8511a850) at action.c:1549 #10 0x000000000045aa5a in do_action (h=0x7ffd50a10760, a=0x7ffa84f1b058, msg=0x7ffa8511a850) at action.c:678 #11 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa84f17f20, msg=0x7ffa8511a850) at action.c:1549 #12 0x000000000045aa5a in do_action (h=0x7ffd50a10760, a=0x7ffa84f15850, msg=0x7ffa8511a850) at action.c:678 #13 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa84f0fa58, msg=0x7ffa8511a850) at action.c:1549 #14 0x000000000045aa5a in do_action (h=0x7ffd50a10760, a=0x7ffa84ef8648, msg=0x7ffa8511a850) at action.c:678 #15 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa84ef6bf8, msg=0x7ffa8511a850) at action.c:1549 #16 0x000000000045df6e in do_action (h=0x7ffd50a10760, a=0x7ffa84eff920, msg=0x7ffa8511a850) at action.c:1045 #17 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa84eed450, msg=0x7ffa8511a850) at action.c:1549 #18 0x000000000045aa5a in do_action (h=0x7ffd50a10760, a=0x7ffa84ec1e58, msg=0x7ffa8511a850) at action.c:678 #19 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa84ec1e58, msg=0x7ffa8511a850) at action.c:1549 #20 0x000000000045df6e in do_action (h=0x7ffd50a10760, a=0x7ffa84ec33e0, msg=0x7ffa8511a850) at action.c:1045 #21 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa84ec33e0, msg=0x7ffa8511a850) at action.c:1549 #22 0x000000000045dfbc in do_action (h=0x7ffd50a10760, a=0x7ffa84ec3510, msg=0x7ffa8511a850) at action.c:1049 #23 0x000000000046a78c in run_actions (h=0x7ffd50a10760, a=0x7ffa84eab4d0, msg=0x7ffa8511a850) at action.c:1549 #24 0x000000000046af11 in run_top_route (a=0x7ffa84eab4d0, msg=0x7ffa8511a850, c=0x0) at action.c:1635 #25 0x0000000000577af3 in receive_msg ( buf=0xa151c0 <buf.6676> "INVITE sip:16789540674@10.150.20.6:5060 SIP/2.0\r\nRecord-Route: sip:10.150.20.2;r2=on;lr;ftag=gK0865ef35\r\nRecord-Route: sip:209.51.167.66;r2=on;lr;ftag=gK0865ef35\r\nRecord-Route: <sip:65.254.44.194;"..., len=1293, rcv_info=0x7ffd50a10aa0) at receive.c:240 #26 0x000000000049ba80 in udp_rcv_loop () at udp_server.c:495 #27 0x0000000000521878 in main_loop () at main.c:1600 #28 0x0000000000528de5 in main (argc=13, argv=0x7ffd50a10fd8) at main.c:2616