(gdb) bt
#0  0x000000000048a5c2 in ast_rtcp_read (rtp=0x98e62e0) at rtp.c:853
#1  0x00002aaabaaee3da in sip_read (ast=0xa542eb0) from /usr/lib/asterisk/modules/chan_sip.so
#2  0x000000000043f942 in __ast_read (chan=0xa542eb0, dropaudio=0) at channel.c:2096
#3  0x00002aaab945a871 in channel_spy (chan=0xa542eb0, spyee_chanspy_ds=<value optimized out>, volfactor=0x40f4615c, fd=0, flags=0x40f47570)
   from /usr/lib/asterisk/modules/app_chanspy.so
#4  0x00002aaab945af7c in common_exec (chan=0xa542eb0, flags=0x40f47570, volfactor=0, fd=0, mygroup=0x40f464f7 "5347", spec=0x40f464f0 "SIP/", 
    exten=0x0, context=0x0) from /usr/lib/asterisk/modules/app_chanspy.so
#5  0x00002aaab945ba65 in chanspy_exec (chan=0xa542eb0, data=0x40f49610) from /usr/lib/asterisk/modules/app_chanspy.so
#6  0x00000000004819ed in pbx_extension_helper (c=0xa542eb0, con=<value optimized out>, context=0xa543100 "macro-bfs-monitor-group", 
    exten=0xa543150 "s", priority=2, label=<value optimized out>, callerid=0xa076830 "101", action=E_SPAWN) at pbx.c:537
#7  0x0000000000481e23 in ast_spawn_extension (c=0x1e, context=0x8000 <Address 0x8000 out of bounds>, exten=0x0, priority=1089592608, 
    callerid=<value optimized out>) at pbx.c:2317
#8  0x00002aaab346657a in _macro_exec (chan=0xa542eb0, data=<value optimized out>, exclusive=0) from /usr/lib/asterisk/modules/app_macro.so
#9  0x00000000004819ed in pbx_extension_helper (c=0xa542eb0, con=<value optimized out>, context=0xa543100 "macro-bfs-monitor-group", 
    exten=0xa543150 "s", priority=1, label=<value optimized out>, callerid=0xa076830 "101", action=E_SPAWN) at pbx.c:537
#10 0x0000000000483726 in __ast_pbx_run (c=0xa542eb0) at pbx.c:2317
#11 0x0000000000484409 in pbx_thread (data=0x1e) at pbx.c:2621
#12 0x00000000004ada4c in dummy_start (data=<value optimized out>) at utils.c:912
#13 0x00002b252180c307 in start_thread () from /lib64/libpthread.so.0
#14 0x00002b25221e7ded in clone () from /lib64/libc.so.6