#0  0x0000000000452bb8 in __ao2_find (c=0x0, arg=0x7f3e5cd068d4, flags=96) at astobj2.c:1237
#1  0x0000000000552581 in ast_rtp_codecs_find_payload_code (codecs=0x24f1430, code=0) at rtp_engine.c:771
#2  0x00007f3e6bfaf04c in bridge_p2p_rtp_write (len=172, rtpheader=0x2026e38, instance=0x215ea58, hdrlen=<optimized out>) at res_rtp_asterisk.c:3413
#3  ast_rtp_read (instance=0x215ea58, rtcp=<optimized out>) at res_rtp_asterisk.c:3603
#4  0x000000000055107c in ast_rtp_instance_read (instance=0x215ea58, rtcp=0) at rtp_engine.c:314
#5  0x00007f3e65f80164 in sip_rtp_read (ast=0x7f3e50190bf8, p=0x21f7ab8, faxdetect=0x7f3e5cd070dc) at chan_sip.c:8326
#6  0x00007f3e65f8090d in sip_read (ast=0x7f3e50190bf8) at chan_sip.c:8423
#7  0x00000000004800a2 in __ast_read (chan=0x7f3e50190bf8, dropaudio=0) at channel.c:4010
#8  0x0000000000481f13 in ast_read (chan=0x7f3e50190bf8) at channel.c:4364
#9  0x00000000004799c6 in ast_safe_sleep_conditional (chan=0x7f3e50190bf8, timeout_ms=1800000, cond=0, data=0x0) at channel.c:1702
#10 0x0000000000479b89 in ast_safe_sleep (chan=0x7f3e50190bf8, ms=1800000) at channel.c:1746
#11 0x000000000054ac7f in pbx_builtin_wait (chan=0x7f3e50190bf8, data=0x7f3e5cd07b00 "1800") at pbx.c:11035
#12 0x000000000052b971 in pbx_exec (c=0x7f3e50190bf8, app=0x7f3e84004960, data=0x7f3e5cd07b00 "1800") at pbx.c:1589
#13 0x0000000000535c64 in pbx_extension_helper (c=0x7f3e50190bf8, con=0x0, context=0x7f3e50191a48 "<SNIP>", exten=0x7f3e50191a98 "s", priority=3, label=0x0, 
    callerid=0x7f3e50008150 "<SNIP>", action=E_SPAWN, found=0x7f3e5cd0bbec, combined_find_spawn=1) at pbx.c:4665
#14 0x000000000053906d in ast_spawn_extension (c=0x7f3e50190bf8, context=0x7f3e50191a48 "<SNIP>", exten=0x7f3e50191a98 "s", priority=3, 
    callerid=0x7f3e50008150 "<SNIP>", found=0x7f3e5cd0bbec, combined_find_spawn=1) at pbx.c:5781
#15 0x000000000053a6ff in __ast_pbx_run (c=0x7f3e50190bf8, args=0x0) at pbx.c:6256
#16 0x000000000053bfe6 in pbx_thread (data=0x7f3e50190bf8) at pbx.c:6586
#17 0x0000000000599911 in dummy_start (data=0x7f3e8471a6e0) at utils.c:1093
#18 0x00007f3e8d282b50 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#19 0x00007f3e8e268a7d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#20 0x0000000000000000 in ?? ()