(gdb) bt
#0  0x00002aaaad6932b4 in q921_transmit (pri=0x1030808be8458b, h=0x2513820, len=13) at q921.c:71
#1  0x00002aaaad6932cf in q921_transmit (pri=0x2aaaad693e68, h=0x2513820, len=13) at q921.c:72
#2  0x00002aaaad6932cf in q921_transmit (pri=0x2aaaad9008f0, h=0x2513820, len=13) at q921.c:72
#3  0x00002aaaad694418 in q921_transmit_iframe (pri=0x2aaaad9008f0, buf=0x40830640, len=9, cr=1) at q921.c:423
#4  0x00002aaaad69b46e in q931_xmit (pri=0x2aaaad9008f0, h=0x40830640, len=9, cr=1) at q931.c:2315
#5  0x00002aaaad69b7bf in send_message (pri=0x2aaaad9008f0, c=0x23da710, msgtype=69, ies=0x2aaaad7ac08c) at q931.c:2376
#6  0x00002aaaad69c3e6 in q931_disconnect (pri=0x2aaaad9008f0, c=0x23da710, cause=16) at q931.c:2692
#7  0x00002aaaad69cb33 in q931_hangup (pri=0x2aaaad9008f0, c=0x23da710, cause=16) at q931.c:2886
#8  0x00002aaaad6924e5 in pri_hangup (pri=0x2aaaad9008f0, call=0x23da710, cause=16) at pri.c:530
#9  0x00002aaaad52e91b in zt_hangup (ast=0x29acdf0) at chan_zap.c:2404
#10 0x0000000000420074 in ast_hangup (chan=0x29acdf0) at channel.c:1026
#11 0x00002aaaae14079a in dial_exec_full (chan=0x290b360, data=0x2773f60, peerflags=0x408323f4) at app_dial.c:186
#12 0x00002aaaae145006 in dial_exec (chan=0x1030808be8458b, data=0x2513820) at app_dial.c:1676
#13 0x0000000000442614 in pbx_extension_helper (c=0x290b360, con=0x40834550, context=0x290b538 "macro-dial_zap", exten=0x4083d240 "dial_zap|004763000631", priority=3, 
    label=0x408365f0 "Zap/g1/004763000631", callerid=0x23aeff0 "21985000", action=-1382904384) at pbx.c:552
#14 0x0000000000442aa3 in ast_spawn_extension (c=0x1030808be8458b, context=0x2513820 "", exten=0x1030808be8458b <Address 0x1030808be8458b out of bounds>, priority=38877200, 
        callerid=0x0) at pbx.c:2169
#15 0x00002aaaaf8a6bca in macro_exec (chan=0x290b360, data=0x1) at app_macro.c:194
#16 0x0000000000442614 in pbx_extension_helper (c=0x290b360, con=0x4083b1a0, context=0x290b538 "macro-dial_zap", exten=0x0, priority=3, label=0x4083d240 "dial_zap|004763000631", 
	    callerid=0x23aeff0 "21985000", action=0) at pbx.c:552
#17 0x00000000004436d1 in __ast_pbx_run (c=0x290b360) at pbx.c:2169
#18 0x0000000000444fa8 in pbx_thread (data=0x290b360) at pbx.c:2454
#19 0x00002aaaaaccab55 in start_thread () from /lib/libpthread.so.0
#20 0x00002aaaab3d57f0 in clone () from /lib/libc.so.6