(gdb) bt
#0  0x080615e3 in ast_channel_inherit_variables (parent=0x81a9340, child=0x81b65e8) at channel.c:2785
#1  0x4099e349 in dial_exec_full (chan=0x81b5658, data=Variable "data" is not available.
) at app_dial.c:1156
#2  0x409a2bfa in dial_exec (chan=0x81a9340, data=0x81a9340) at app_dial.c:1690
#3  0x080910ab in pbx_exec (c=0x81b5658, app=0x81b2da0, data=0x40b395de, newstack=1) at pbx.c:564
#4  0x40491280 in handle_exec (chan=0x81b5658, agi=0x40b39f54, argc=3, argv=0x40b393d4) at res_agi.c:1083
#5  0x40493109 in agi_exec_full (chan=0x81b5658, data=Variable "data" is not available.
) at res_agi.c:1817
#6  0x08092484 in pbx_extension_helper (c=0x81b5658, con=Variable "con" is not available.
) at pbx.c:564
#7  0x08093bf5 in __ast_pbx_run (c=0x81b5658) at pbx.c:2235
#8  0x080956fc in pbx_thread (data=0x81a9340) at pbx.c:2522
#9  0x40028e31 in pthread_start_thread () from /lib/i686/libpthread.so.0
#10 0x401d759a in clone () from /lib/i686/libc.so.6