-- Executing [3177777066@evilgenius-incoming:1] Goto("SIP/lightbound-00000000", "s,1") in new stack
    -- Goto (evilgenius-incoming,s,1)
    -- Executing [s@evilgenius-incoming:1] Ringing("SIP/lightbound-00000000", "") in new stack
    -- Executing [s@evilgenius-incoming:2] Wait("SIP/lightbound-00000000", "2") in new stack
    -- Executing [s@evilgenius-incoming:3] Playback("SIP/lightbound-00000000", "tt-allbusy") in new stack
    -- <SIP/lightbound-00000000> Playing 'tt-allbusy.gsm' (language 'en')
  == Redirecting 'SIP/lightbound-00000000' to fax extension
  == Spawn extension (evilgenius-incoming, fax, 1) exited non-zero on 'SIP/lightbound-00000000'
    -- Executing [fax@evilgenius-incoming:1] NoOp("SIP/lightbound-00000000", "foo") in new stack
    -- Executing [fax@evilgenius-incoming:2] Set("SIP/lightbound-00000000", "FAXFILE=/var/spool/asterisk-fax/fax-1263404426.0.tif") in new stack
    -- Executing [fax@evilgenius-incoming:3] Set("SIP/lightbound-00000000", "FAXFILENOEXT=/var/spool/asterisk-fax/fax-1263404426.0") in new stack
    -- Executing [fax@evilgenius-incoming:4] ReceiveFAX("SIP/lightbound-00000000", "/var/spool/asterisk-fax/fax-1263404426.0.tif") in new stack
[Jan 13 12:40:34] WARNING[24576]: udptl.c:766 calculate_far_max_ifp: (no tag): Cannot calculate far_max_ifp before far_max_datagram has been set.

*CLI> 
*CLI> 
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb6462b90 (LWP 24579)]
0xb734fd54 in ao2_unlock@plt () from /usr/local/lib/asterisk/modules/chan_sip.so
Current language:  auto; currently asm
(gdb) bt
#0  0xb734fd54 in ao2_unlock@plt () from /usr/local/lib/asterisk/modules/chan_sip.so
#1  0xb737be07 in sip_write (ast=0xb697e228, frame=0xb644c63c) at chan_sip.c:6307
#2  0x0809ead8 in ast_write (chan=0xb697e228, fr=0xb644c63c) at channel.c:3487
#3  0xb753b7bc in t38_tx_packet_handler (s=0xb644cd08, user_data=0xb697e228, buf=0xb644c6b8 "À\001\200", len=6, count=1)
    at app_fax.c:194
#4  0xb74877c9 in t38_core_send_data () from /usr/lib/libspandsp.so.1
#5  0xb748d175 in t38_terminal_send_timeout () from /usr/lib/libspandsp.so.1
#6  0xb753d089 in transmit_t38 (s=0xb645de10) at app_fax.c:666
#7  0xb753dbda in transmit (s=0xb645de10) at app_fax.c:807
#8  0xb753dd7c in rcvfax_exec (chan=0xb697e228, data=0xb645ff14) at app_fax.c:907
#9  0x08106a77 in pbx_exec (c=0xb697e228, app=0xb693a8c0, data=0xb645ff14) at pbx.c:1348
#10 0x081119e6 in pbx_extension_helper (c=0xb697e228, con=0x0, context=0xb697e498 "evilgenius-incoming", exten=0xb697e4e8 "fax", 
    priority=4, label=0x0, callerid=0xb697eba0 "3172595050", action=E_SPAWN, found=0xb6462348, combined_find_spawn=1) at pbx.c:3708
#11 0x08113cbd in __ast_pbx_run (c=0xb697e228, args=0x0) at pbx.c:4167
#12 0x08115530 in pbx_thread (data=0xb697e228) at pbx.c:4544
#13 0x08155e6b in dummy_start (data=0xb697f508) at utils.c:968
#14 0xb7aac4c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#15 0xb7cdc6de in clone () from /lib/i686/cmov/libc.so.6
(gdb) quit