(gdb) bt full
#0  0x001b31e3 in _int_malloc () from /lib/libc.so.6
No symbol table info available.
#1  0x001b3ffd in calloc () from /lib/libc.so.6
No symbol table info available.
#2  0x0807f7bd in ast_channel_alloc (needqueue=1, state=0, cid_num=0xb752d564 "0", cid_name=0xb752d503 "025388103", 
    acctcode=0x8141360 "", exten=0xb752d50d "972527655681", context=0xb752d4bf "rm1", amaflag=0, name_fmt=0x7c1496 "SIP/%s-%08x")
    at /usr/src/asterisk-1.4.18/include/asterisk/utils.h:359
        tmp = <value optimized out>
        flags = <value optimized out>
        ap1 = <value optimized out>
        ap2 = <value optimized out>
        __PRETTY_FUNCTION__ = "ast_channel_alloc"
#3  0x007722e6 in sip_new (i=0xb7512dc8, state=0, title=<value optimized out>) at chan_sip.c:3961
        my_name = 0xb7522248 "323c-Ï\"ñÿÿÿÿÿ\020À\001\200\t\001\a\001"
        tmp = <value optimized out>
        v = <value optimized out>
        fmt = <value optimized out>
        what = <value optimized out>
        needvideo = <value optimized out>
        video = <value optimized out>
        __PRETTY_FUNCTION__ = "sip_new"
#4  0x007b3cdf in handle_request_invite (p=0xb7512dc8, req=0xb7a7cf1c, debug=0, seqno=102, sin=0xb7a7e240, recount=0xb7a7e250, 
    e=0xb7a7d13f "sip:972527655681@ngn4.client.pins.net", nounlock=0xb7a7e254) at chan_sip.c:13896
        bridgepeer = <value optimized out>
        res = <value optimized out>
        gotdest = 0
        p_replaces = <value optimized out>
        replace_id = 0x0
        required = 0x7c140a ""
        required_profile = <value optimized out>
        c = <value optimized out>
        reinvite = 0
        __PRETTY_FUNCTION__ = "handle_request_invite"
#5  0x007b6937 in handle_request (p=0xb7512dc8, req=0xb7a7cf1c, sin=0xb7a7e240, recount=0xb7a7e250, nounlock=0xb7a7e254)
    at chan_sip.c:15241
        cmd = 0xa <Address 0xa out of bounds>
        cseq = <value optimized out>
        useragent = 0xb7a7d28c "Enswitch"
        seqno = 102
        len = <value optimized out>
        ignore = 0
        respid = <value optimized out>
        res = <value optimized out>
        debug = 0
        e = 0xb7a7d13f "sip:972527655681@ngn4.client.pins.net"
        __PRETTY_FUNCTION__ = "handle_request"
#6  0x007b80de in sipsock_read (id=0x90af740, fd=14, events=1, ignore=0x0) at chan_sip.c:15388
        req = {rlPart1 = 0xb7a7d138 "INVITE", rlPart2 = 0xb7a7d13f "sip:972527655681@ngn4.client.pins.net", len = 820, 
  headers = 14, method = 5, lines = 11, flags = 0, header = {0xb7a7d138 "INVITE", 
    0xb7a7d16e "Via: SIP/2.0/UDP 209.212.93.54:5060;branch=z9hG4bK070c8860;rport", 
    0xb7a7d1b0 "From: \"025388103\" <sip:0@209.212.93.54>;tag=as6fe34e3f", 
---Type <return> to continue, or q <return> to quit---
    0xb7a7d1e8 "To: <sip:972527655681@ngn4.client.pins.net>", 0xb7a7d215 "Contact: <sip:0@209.212.93.54>", 
    0xb7a7d235 "Call-ID: 383d4bd86f1abccd514d75bf31a51bd5@209.212.93.54", 0xb7a7d26e "CSeq: 102 INVITE", 
    0xb7a7d280 "User-Agent: Enswitch", 0xb7a7d296 "Max-Forwards: 70", 0xb7a7d2a8 "Date: Thu, 20 Mar 2008 10:19:28 GMT", 
    0xb7a7d2cd "Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY", 
    0xb7a7d311 "Diversion: <sip:972775664179@ngn2.client.pins.net>", 0xb7a7d345 "Content-Type: application/sdp", 
    0xb7a7d364 "Content-Length: 241", 0xb7a7d379 "", 0x0 <repeats 49 times>}, line = {0xb7a7d37b "v=0", 
    0xb7a7d380 "o=root 13876 13876 IN IP4 209.212.93.54", 0xb7a7d3a9 "s=session", 0xb7a7d3b4 "c=IN IP4 209.212.93.54", 
    0xb7a7d3cc "t=0 0", 0xb7a7d3d3 "m=audio 11054 RTP/AVP 18 101", 0xb7a7d3f1 "a=rtpmap:18 G729/8000", 
    0xb7a7d408 "a=fmtp:18 annexb=no", 0xb7a7d41d "a=rtpmap:101 telephone-event/8000", 0xb7a7d440 "a=fmtp:101 0-16", 
    0xb7a7d451 "a=silenceSupp:off - - - -", 0xb7a7d46c "", 0x0 <repeats 52 times>}, 
  data = "INVITE\000sip:972527655681@ngn4.client.pins.net\000SIP/2.0\000\000Via: SIP/2.0/UDP 209.212.93.54:5060;branch=z9hG4bK070c8860;rport\000\000From: \"025388103\" <sip:0@209.212.93.54>;tag=as6fe34e3f\000\000To: <sip:972527655681@ng"..., sdp_start = 0, 
  sdp_end = 11}
        sin = {sin_family = 2, sin_port = 50195, sin_addr = {s_addr = 912118993}, sin_zero = "\000\000\000\000\000\000\000"}
        p = (struct sip_pvt *) 0xb7512dc8
        res = <value optimized out>
        len = 16
        nounlock = 0
        recount = 0
        lockretry = 100
        __PRETTY_FUNCTION__ = "sipsock_read"
#7  0x080a95d0 in ast_io_wait (ioc=0x90ada18, howlong=1000) at io.c:279
        res = 1
        x = 0
        origcnt = 1
#8  0x00793569 in do_monitor (data=0x0) at chan_sip.c:15601
        res = <value optimized out>
        sip = (struct sip_pvt *) 0x0
        t = 1206008617
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 2
        reloading = <value optimized out>
        __PRETTY_FUNCTION__ = "do_monitor"
#9  0x080f8f4b in dummy_start (data=0x90b2210) at utils.c:852
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {151724576, 0, -1213731952, -1213733944, 1326500012, -256334616}, 
      __mask_was_saved = 0}}, __pad = {0xb7a7e480, 0x0, 0x0, 0x0}}
        __cancel_arg = (void *) 0xb7a7eb90
        not_first_call = <value optimized out>
        ret = <value optimized out>
#10 0x002c245b in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#11 0x0021a24e in clone () from /lib/libc.so.6
No symbol table info available.