(gdb) bt full
#0  0x007a47a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
No symbol table info available.
#1  0x007e47f5 in raise () from /lib/tls/libc.so.6
No symbol table info available.
#2  0x007e6199 in abort () from /lib/tls/libc.so.6
No symbol table info available.
#3  0x008184ea in __libc_message () from /lib/tls/libc.so.6
No symbol table info available.
#4  0x0081e50d in malloc_consolidate () from /lib/tls/libc.so.6
No symbol table info available.
#5  0x0081f2f3 in _int_malloc () from /lib/tls/libc.so.6
No symbol table info available.
#6  0x00820e26 in calloc () from /lib/tls/libc.so.6
No symbol table info available.
#7  0x080bc17a in _ast_calloc (num=1, len=5464, file=0x47eb13 "chan_sip.c", lineno=3995, func=0x480c69 "sip_alloc")
    at include/asterisk/utils.h:330
        p = (void *) 0x8274f1
        __PRETTY_FUNCTION__ = "_ast_calloc"
#8  0x0044424e in sip_alloc (callid=0xb7c3b3e7 "00078599-3d3d0029-54a3cee0-5dad2ffa@192.168.0.200", sin=0xb7c3b0f0,
    useglobal_nat=1, intended_method=5) at chan_sip.c:3995
        p = (struct sip_pvt *) 0x43b7d1
        __PRETTY_FUNCTION__ = "sip_alloc"
#9  0x004453fb in find_call (req=0xb7c3b100, sin=0xb7c3b0f0, intended_method=5) at chan_sip.c:4184
        p = (struct sip_pvt *) 0x0
        tag = 0x47edd6 ""
        totag = "\000\000\000\000qt\202\000\000\000\000\000XÄH\000P)Ñ·\000±Ã·H°Ã·ÍÌD\0006³Ã·ñt\202\000\000\000\000EXÄH\000P)Ñ·\000±Ã·h°Ã·(¦C\000iìG\000\034³Ã·\000\000\000\000\216cD\000\000±Ã·\001\000\000\000\006\000\000\000\006\000\000\000\006\000\000\000XÄH\000\230°Ã·²¦C\000\005\000\000\000\027Í\222\000\001\000\000\000XÄH"
        fromtag = '\0' <repeats 127 times>
        callid = 0xb7c3b3e7 "00078599-3d3d0029-54a3cee0-5dad2ffa@192.168.0.200"
        from = 0xb7c3b381 "\"7706\" <sip:7706@90.0.0.21>;tag=000785993d3d00425eb6c41b-64129958"
        to = 0xb7c3b3c8 "<sip:7704@90.0.0.21>"
        cseq = 0xb7c3b420 "101 INVITE"
        __PRETTY_FUNCTION__ = "find_call"
#10 0x004735b3 in sipsock_read (id=0x9f1f460, fd=13, events=1, ignore=0x0) at chan_sip.c:14174
        req = {rlPart1 = 0xb7c3b31c "INVITE", rlPart2 = 0xb7c3b323 "sip:7704@90.0.0.21", len = 778, headers = 13,
  method = 5, lines = 11, flags = 0, header = {0xb7c3b31c "INVITE",
    0xb7c3b33f "Via: SIP/2.0/UDP 192.168.0.200:5060;branch=z9hG4bK76aa9107",
    0xb7c3b37b "From: \"7706\" <sip:7706@90.0.0.21>;tag=000785993d3d00425eb6c41b-64129958",
    0xb7c3b3c4 "To: <sip:7704@90.0.0.21>", 0xb7c3b3de "Call-ID: 00078599-3d3d0029-54a3cee0-5dad2ffa@192.168.0.200",
    0xb7c3b41a "CSeq: 101 INVITE", 0xb7c3b42c "User-Agent: CSCO/7", 0xb7c3b440 "Contact: <sip:7706@192.168.0.200:5060>",
    0xb7c3b468 "Expires: 180", 0xb7c3b476 "Content-Type: application/sdp", 0xb7c3b495 "Content-Length: 248",
    0xb7c3b4aa "Accept: application/sdp",
    0xb7c3b4c3 "Remote-Party-ID: \"7706\" <sip:7706@192.168.0.200>;party=calling;id-type=subscriber;privacy=off;screen=no", 0xb7c3b52c "", 0x0 <repeats 50 times>}, line = {0xb7c3b52e "v=0",
---Type <return> to continue, or q <return> to quit---
    0xb7c3b533 "o=Cisco-SIPUA 4971 17050 IN IP4 192.168.0.200", 0xb7c3b562 "s=SIP Call",
    0xb7c3b56e "c=IN IP4 192.168.0.200", 0xb7c3b586 "t=0 0", 0xb7c3b58d "m=audio 29830 RTP/AVP 0 8 18 101",
    0xb7c3b5af "a=rtpmap:0 PCMU/8000", 0xb7c3b5c5 "a=rtpmap:8 PCMA/8000", 0xb7c3b5db "a=rtpmap:18 G729/8000",
    0xb7c3b5f2 "a=rtpmap:101 telephone-event/8000", 0xb7c3b615 "a=fmtp:101 0-15", 0xb7c3b626 "", 0x0 <repeats 52 times>},
  data = "INVITE\000sip:7704@90.0.0.21\000SIP/2.0\000\000Via: SIP/2.0/UDP 192.168.0.200:5060;branch=z9hG4bK76aa9107\000\000From: \"7706\" <sip:7706@90.0.0.21>;tag=000785993d3d00425eb6c41b-64129958\000\000To: <sip:7704@90.0.0.21>\000\000Call-I"..., sdp_start = 0, sdp_end = 0}
        sin = {sin_family = 2, sin_port = 14790, sin_addr = {s_addr = 3355486400},
  sin_zero = "\000\000\000\000\000\000\000"}
        p = (struct sip_pvt *) 0x9f76050
        res = 778
        len = 16
        nounlock = 0
        recount = 0
        lockretry = 100
        __PRETTY_FUNCTION__ = "sipsock_read"
#11 0x080577eb in ast_io_wait (ioc=0xb7d03bd0, howlong=1000) at io.c:279
        res = 1
        x = 0
        origcnt = 1
#12 0x00474060 in do_monitor (data=0x0) at chan_sip.c:14392
        res = 1000
        sip = (struct sip_pvt *) 0x0
        peer = (struct sip_peer *) 0x0
        t = 1156056344
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 4
        reloading = 0
        __PRETTY_FUNCTION__ = "do_monitor"
#13 0x080bcfc7 in dummy_start (data=0xb7d16be0) at utils.c:538
        _buffer = {__routine = 0x80a883d <ast_unregister_thread>, __arg = 0xb7c3cbb0, __canceltype = 0, __prev = 0x0}
        ret = (void *) 0x0
        a = {start_routine = 0x473c4a <do_monitor>, data = 0x0,
  name = 0xb7d16bf0 "do_monitor", ' ' <repeats 11 times>, "started at [14451] chan_sip.c restart_monitor()"}
#14 0x0092b371 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#15 0x008849be in clone () from /lib/tls/libc.so.6
No symbol table info available.
(gdb)