#0  0xb78e54f4 in local_queue_frame (p=0xb6108938, isoutbound=1, f=0x84bfa7c, us=0xb610ea50, us_locked=1) at chan_local.c:172
#1  0xb78e5b54 in local_write (ast=0xb610ea50, f=0x84bfa7c) at chan_local.c:324
#2  0x0808b02d in ast_write (chan=0xb610ea50, fr=0x84bd838) at channel.c:2877
#3  0x080b22c5 in playtones_generator (chan=0xb610ea50, data=0x84bd800, len=320, samples=160) at indications.c:191
#4  0x08086a88 in generator_force (data=0xb610ea50) at channel.c:1619
#5  0x08088079 in __ast_read (chan=0xb610ea50, dropaudio=0) at channel.c:2100
#6  0x08089bcc in ast_read (chan=0xb610ea50) at channel.c:2434
#7  0x080d285a in wait_for_hangup (chan=0xb610ea50, data=0x814ef93) at pbx.c:5369
#8  0x080d295d in pbx_builtin_congestion (chan=0xb610ea50, data=0x814ef93) at pbx.c:5417
#9  0x080c6258 in pbx_exec (c=0xb610ea50, app=0x81953e0, data=0xb6990008) at pbx.c:537
#10 0x080c9812 in pbx_extension_helper (c=0xb610ea50, con=0x0, context=0xb610ebd0 "macro-outisbusy", exten=0xb610ec20 "s", priority=3, label=0x0, callerid=0x839cd28 "02086503228", action=E_SPAWN)
    at pbx.c:1863
#11 0x080ca981 in ast_spawn_extension (c=0xb610ea50, context=0xb610ebd0 "macro-outisbusy", exten=0xb610ec20 "s", priority=3, callerid=0x839cd28 "02086503228") at pbx.c:2318
#12 0xb6f566c6 in _macro_exec (chan=0xb610ea50, data=0xb69950f8, exclusive=0) at app_macro.c:346
#13 0xb6f575ab in macro_exec (chan=0xb610ea50, data=0xb69950f8) at app_macro.c:521
#14 0x080c6258 in pbx_exec (c=0xb610ea50, app=0x8225f68, data=0xb69950f8) at pbx.c:537
#15 0x080c9812 in pbx_extension_helper (c=0xb610ea50, con=0x0, context=0xb610ebd0 "macro-outisbusy", exten=0xb610ec20 "s", priority=5, label=0x0, callerid=0x839cd28 "02086503228", action=E_SPAWN)
    at pbx.c:1863
#16 0x080ca981 in ast_spawn_extension (c=0xb610ea50, context=0xb610ebd0 "macro-outisbusy", exten=0xb610ec20 "s", priority=5, callerid=0x839cd28 "02086503228") at pbx.c:2318
#17 0x080cae29 in __ast_pbx_run (c=0xb610ea50) at pbx.c:2407
#18 0x080cbe40 in pbx_thread (data=0xb610ea50) at pbx.c:2622
#19 0x0810f8ca in dummy_start (data=0xb6108c88) at utils.c:856
#20 0xb7ec94fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#21 0xb7de2e5e in clone () from /lib/tls/i686/cmov/libc.so.6