(gdb) bt full
#0  0x0018b7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
No symbol table info available.
#1  0x001cb7f5 in raise () from /lib/tls/libc.so.6
No symbol table info available.
#2  0x001cd199 in abort () from /lib/tls/libc.so.6
No symbol table info available.
#3  0x001ff4ea in __libc_message () from /lib/tls/libc.so.6
No symbol table info available.
#4  0x0020664c in _int_malloc () from /lib/tls/libc.so.6
No symbol table info available.
#5  0x00207e26 in calloc () from /lib/tls/libc.so.6
No symbol table info available.
#6  0x080bb8f2 in _ast_calloc (num=1, len=5464, file=0x261e8d3 "chan_sip.c", lineno=3991, func=0x2620a1d "sip_alloc")
    at include/asterisk/utils.h:313
        p = (void *) 0x20e4f1
        __PRETTY_FUNCTION__ = "_ast_calloc"
#7  0x025e6bc6 in sip_alloc (callid=0x4c383ed "00078599-3d3d0013-464220eb-6fc581ff@192.168.0.200", sin=0x4c380f0, useglobal_nat=1,
    intended_method=5) at chan_sip.c:3991
        p = (struct sip_pvt *) 0x25de80d
        __PRETTY_FUNCTION__ = "sip_alloc"
#8  0x025e7bdf in find_call (req=0x4c38100, sin=0x4c380f0, intended_method=5) at chan_sip.c:4180
        p = (struct sip_pvt *) 0x0
        tag = 0x261eb96 ""
        totag = "\000\000\000\000qä \000\000\000\000\000XÄb\002P \027\t\000\201Ã\004H\200Ã\004Iò^\0027\203Ã\004ñä \000\000\000\000EXÄb\002P \027\t\000\201Ã\004h\200Ã\004dÖ]\002)êa\002\034\203Ã\004\000\000\000\000K\211^\002\000\201Ã\004\001\000\000\000\006\000\000\000\006\000\000\000\006\000\000\000XÄb\002\230\200Ã\004îÖ]\002\005\000\000\000\027=1\000\001\000\000\000XÄb\002"
        fromtag = '\0' <repeats 127 times>
        callid = 0x4c383ed "00078599-3d3d0013-464220eb-6fc581ff@192.168.0.200"
        from = 0x4c38382 "\"foxtrot\" <sip:5706@90.00.0.62>;tag=000785993d3d001220d59540-47c67c8c"
        to = 0x4c383cd "<sip:7704@90.00.0.62>"
        cseq = 0x4c38426 "101 INVITE"
        __PRETTY_FUNCTION__ = "find_call"
#9  0x026135a0 in sipsock_read (id=0x918f1f0, fd=27, events=1, ignore=0x0) at chan_sip.c:14156
        req = {rlPart1 = 0x4c3831c "INVITE", rlPart2 = 0x4c38323 "sip:7704@90.00.0.62", len = 787, headers = 13, method = 5, lines = 11,
  flags = 0, header = {0x4c3831c "INVITE", 0x4c38340 "Via: SIP/2.0/UDP 192.168.0.200:5060;branch=z9hG4bK3a673395",
    0x4c3837c "From: \"foxtrot\" <sip:5706@90.00.0.62>;tag=000785993d3d001220d59540-47c67c8c", 0x4c383c9 "To: <sip:7704@90.00.0.62>",
    0x4c383e4 "Call-ID: 00078599-3d3d0013-464220eb-6fc581ff@192.168.0.200", 0x4c38420 "CSeq: 101 INVITE", 0x4c38432 "User-Agent: CSCO/7",
    0x4c38446 "Contact: <sip:5706@192.168.0.200:5060>", 0x4c3846e "Expires: 180", 0x4c3847c "Content-Type: application/sdp",
    0x4c3849b "Content-Length: 248", 0x4c384b0 "Accept: application/sdp",
    0x4c384c9 "Remote-Party-ID: \"foxtrot\" <sip:5706@192.168.0.200>;party=calling;id-type=subscriber;privacy=off;screen=no", 0x4c38535 "",
    0x0 <repeats 50 times>}, line = {0x4c38537 "v=0", 0x4c3853c "o=Cisco-SIPUA 15082 1485 IN IP4 192.168.0.200", 0x4c3856b "s=SIP Call",
    0x4c38577 "c=IN IP4 192.168.0.200", 0x4c3858f "t=0 0", 0x4c38596 "m=audio 22686 RTP/AVP 0 8 18 101", 0x4c385b8 "a=rtpmap:0 PCMU/8000",
    0x4c385ce "a=rtpmap:8 PCMA/8000", 0x4c385e4 "a=rtpmap:18 G729/8000", 0x4c385fb "a=rtpmap:101 telephone-event/8000",
    0x4c3861e "a=fmtp:101 0-15", 0x4c3862f "", 0x0 <repeats 52 times>},
  data = "INVITE\000sip:7704@90.00.0.62\000SIP/2.0\000\000Via: SIP/2.0/UDP 192.168.0.200:5060;branch=z9hG4bK3a673395\000\000From: \"foxtrot\" <sip:5706@90.00.0.62>;tag=000785993d3d001220d59540-47c67c8c\000\000To: <sip:7704@90.00.0.62>\000\000"..., sdp_start = 0, sdp_end = 0}
        sin = {sin_family = 2, sin_port = 10956, sin_addr = {s_addr = 3355486400}, sin_zero = "\000\000\000\000\000\000\000"}
        p = (struct sip_pvt *) 0x924df38
        res = 787
        len = 16
        nounlock = 0
        recount = 0
        lockretry = 100
        __PRETTY_FUNCTION__ = "sipsock_read"
#10 0x0805763f in ast_io_wait (ioc=0x9129b78, howlong=1000) at io.c:279
        res = 1
        x = 0
        origcnt = 1
#11 0x02614029 in do_monitor (data=0x0) at chan_sip.c:14354
---Type <return> to continue, or q <return> to quit---
        res = 1000
        sip = (struct sip_pvt *) 0x0
        peer = (struct sip_peer *) 0x0
        t = 1154352210
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 133
        reloading = 0
        __PRETTY_FUNCTION__ = "do_monitor"
#12 0x080bc506 in dummy_start (data=0x9186d20) at utils.c:554
        _buffer = {__routine = 0x80a7e75 <ast_unregister_thread>, __arg = 0x4c39bb0, __canceltype = 0, __prev = 0x0}
        ret = (void *) 0x0
        a = {start_routine = 0x2613c37 <do_monitor>, data = 0x0,
  name = 0x9186f60 "do_monitor", ' ' <repeats 11 times>, "started at [14413] chan_sip.c restart_monitor()"}
#13 0x00312371 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#14 0x0026b9be in clone () from /lib/tls/libc.so.6
No symbol table info available.
(gdb)