#0  0xb7fbbce4 in pthread_mutex_lock () from /lib/tls/libpthread.so.0
#1  0xa7a9d91c in sip_fixup (oldchan=0x81bf410, newchan=0x81bf410) at chan_sip.c:1837
#2  0x08061873 in ast_do_masquerade (original=0x81bf410) at channel.c:2387
#3  0x0805e218 in ast_read (chan=0x81bf410) at channel.c:1211
#4  0x08062a09 in ast_channel_bridge (c0=0x9f68fd80, c1=0x81bf410, config=0x81fe4560,
    fo=0x81fe3fc8, rc=0x81fe3fc4) at channel.c:2699
#5  0xb1b8e7d7 in ast_bridge_call (chan=0x9f68fd80, peer=0x81bf410, config=0x81fe4560)
    at res_features.c:360
#6  0xa382cf29 in dial_exec (chan=0x9f68fd80, data=0x81fe4bfa) at app_dial.c:1141
#7  0x08079c97 in pbx_exec (c=0x9f68fd80, app=0x81a2c00, data=0x81fe4bfa, newstack=1)
    at pbx.c:475
#8  0xb1b97e60 in handle_exec (chan=0x9f68fd80, agi=0x81fe5450, argc=3, argv=0x81fe49b0)
    at res_agi.c:918
#9  0xb1b98fb5 in agi_handle_command (chan=0x9f68fd80, agi=0x81fe5450, buf=0x81fe4bf0 "EXEC")
    at res_agi.c:1603
#10 0xb1b99358 in run_agi (chan=0x9f68fd80, request=0x81fe5480 "ExtensionDial.agi",
    agi=0x81fe5450, pid=23663, dead=0) at res_agi.c:1683
#11 0xb1b99a18 in agi_exec_full (chan=0x9f68fd80, data=0x81fe8010, enhanced=0, dead=0)
    at res_agi.c:1822
#12 0xb1b99b74 in agi_exec (chan=0x9f68fd80, data=0x81fe8010) at res_agi.c:1835
#13 0x08079c97 in pbx_exec (c=0x9f68fd80, app=0x8107850, data=0x81fe8010, newstack=1)
    at pbx.c:475
#14 0x0807c312 in pbx_extension_helper (c=0x9f68fd80, con=0x0,
    context=0x9f68fecc "macro-extdial", exten=0x9f68ffc0 "s", priority=3, label=0x0,
    callerid=0x9f6ad010 "2218", action=1) at pbx.c:1275
#15 0x0807d5c2 in ast_spawn_extension (c=0x9f68fd80, context=0x9f68fecc "macro-extdial",
    exten=0x9f68ffc0 "s", priority=3, callerid=0x9f6ad010 "2218") at pbx.c:1819
#16 0xa3848357 in macro_exec (chan=0x9f68fd80, data=0x81fec7c0) at app_macro.c:153
#17 0x08079c97 in pbx_exec (c=0x9f68fd80, app=0x81a1438, data=0x81fec7c0, newstack=1)
    at pbx.c:475
#18 0x0807c312 in pbx_extension_helper (c=0x9f68fd80, con=0x0,
    context=0x9f68fecc "macro-extdial", exten=0x9f68ffc0 "s", priority=1, label=0x0,
    callerid=0x9f6ad010 "2218", action=1) at pbx.c:1275
#19 0x0807d5c2 in ast_spawn_extension (c=0x9f68fd80, context=0x9f68fecc "macro-extdial",
    exten=0x9f68ffc0 "s", priority=1, callerid=0x9f6ad010 "2218") at pbx.c:1819
#20 0x0807d9e1 in ast_pbx_run (c=0x9f68fd80) at pbx.c:1881
#21 0x0807e57c in pbx_thread (data=0x9f68fd80) at pbx.c:2064
#22 0xb7fb998c in start_thread () from /lib/tls/libpthread.so.0
#23 0xb7eaa7da in clone () from /lib/tls/libc.so.6