(gdb) bt full
#0  0x00002b9c8bfa4fa0 in main_arena () from /lib64/libc.so.6
No symbol table info available.
#1  0x00000000004483e8 in ast_setstate (chan=0x4483e8, state=AST_STATE_DOWN) at channel.c:3893
        oldstate = 0
#2  0x00002aaab4fd8aa1 in handle_request_invite (p=0x81cac0, req=0x406c9ba0, debug=1, seqno=2, sin=0x406c9b90, recount=0x406c9b84, 
    e=0x406c9fcf "sip:107@192.168.2.9", nounlock=0x406c9b88) from /usr/lib/asterisk/modules/chan_sip.so
        sendok = 1
        bridgepeer = (struct ast_channel *) 0x0
        bridgepvt = (struct sip_pvt *) 0x0
        res = 1
        gotdest = 0
        p_replaces = 0x2aaab4fecf3a ""
        replace_id = 0x0
        required = 0x2aaab4fecf3a ""
        required_profile = 0
        c = (struct ast_channel *) 0x83f180
        reinvite = 1
        __PRETTY_FUNCTION__ = "handle_request_invite"
#3  0x00002aaab4fde989 in handle_request (p=0x81cac0, req=0x406c9ba0, sin=0x406c9b90, recount=0x406c9b84, nounlock=0x406c9b88)
   from /usr/lib/asterisk/modules/chan_sip.so
        cmd = 0x406c9fc8 "INVITE"
        cseq = 0x406ca15f "2 INVITE"
        useragent = 0x406ca228 "eyeBeam release 1004p stamp 31962"
        seqno = 2
        len = 1
        ignore = 0
        respid = 0
        res = 0
        debug = 1
        e = 0x406c9fcf "sip:107@192.168.2.9"
        error = 0
        __PRETTY_FUNCTION__ = "handle_request"
#4  0x00002aaab4fdf3e7 in sipsock_read (id=0x698f40, fd=80, events=1, ignore=0x0) from /usr/lib/asterisk/modules/chan_sip.so
        req = {rlPart1 = 0x406c9fc8 "INVITE", rlPart2 = 0x406c9fcf "sip:107@192.168.2.9", len = 900, headers = 15, method = 5, lines = 10, flags = 1, 
  header = {0x406c9fc8 "INVITE", 0x406c9fec "Via: SIP/2.0/UDP 192.168.2.20:14770;branch=z9hG4bK-d87543-7e18296a6442ce2d-1--d87543-;rport", 
    0x406ca049 "Max-Forwards: 70", 0x406ca05b "Contact: <sip:403@192.168.2.20:14770;rinstance=02b8fa25844258dd>", 
    0x406ca09d "To: \"Elena Calvino\"<sip:107@192.168.2.9>;tag=as314f456e", 
    0x406ca0d6 "From: <sip:403@192.168.2.20:14770;rinstance=02b8fa25844258dd>;tag=a114bf3f", 
    0x406ca122 "Call-ID: 10343e804da5ed9c286209f008be2cfd@192.168.2.9", 0x406ca159 "CSeq: 2 INVITE", 0x406ca169 "Session-Expires: 95;refresher=uac", 
---Type <return> to continue, or q <return> to quit---
    0x406ca18c "Min-SE: 90", 0x406ca198 "Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO", 
    0x406ca1eb "Content-Type: application/sdp", 0x406ca20a "Supported: timer", 0x406ca21c "User-Agent: eyeBeam release 1004p stamp 31962", 
    0x406ca24b "Content-Length: 234", 0x406ca260 "", 0x0 <repeats 48 times>}, line = {0x406ca262 "v=0", 0x406ca267 "o=- 0 3 IN IP4 192.168.2.20", 
    0x406ca284 "s=CounterPath eyeBeam 1.5", 0x406ca29f "c=IN IP4 0.0.0.0", 0x406ca2b1 "t=0 0", 0x406ca2b8 "m=audio 32694 RTP/AVP 0 3 101", 
    0x406ca2d7 "a=fmtp:101 0-15", 0x406ca2e8 "a=rtpmap:101 telephone-event/8000", 0x406ca30b "a=sendonly", 
    0x406ca317 "a=x-rtp-session-id:AB768A90C52C46129E3A8B1AD8F45556", 0x406ca34c "", 0x0 <repeats 53 times>}, 
  data = "INVITE\000sip:107@192.168.2.9\000SIP/2.0\000\000Via: SIP/2.0/UDP 192.168.2.20:14770;branch=z9hG4bK-d87543-7e18296a6442ce2d-1--d87543-;rport\000\000Max-Forwards: 70\000\000Contact: <sip:403@192.168.2.20:14770;rinstance=02b8fa"..., sdp_start = 0, sdp_end = 10}
        sin = {sin_family = 2, sin_port = 45625, sin_addr = {s_addr = 335718592}, sin_zero = "\000\000\000\000\000\000\000"}
        p = (struct sip_pvt *) 0x81cac0
        res = 900
        len = 16
        nounlock = 0
        recount = 0
        lockretry = 100
        __PRETTY_FUNCTION__ = "sipsock_read"
#5  0x0000000000472dbe in ast_io_wait (ioc=0x2aaaab03f050, howlong=963) at io.c:279
        res = 1
        x = 0
        origcnt = 1
#6  0x00002aaab4fdfef7 in do_monitor (data=0x0) from /usr/lib/asterisk/modules/chan_sip.so
        res = 963
        sip = (struct sip_pvt *) 0x0
        peer = (struct sip_peer *) 0x0
        t = 1190890401
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 107
        reloading = 0
        __PRETTY_FUNCTION__ = "do_monitor"
#7  0x00000000004d13b2 in dummy_start (data=0x2aaaab042f90) at utils.c:767
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {0, -69024807374606860, 47951352746240, 140733721094672, 3, 1080868864, -69024807374607180, 
        -69024806303003002}, __mask_was_saved = 0}}, __pad = {0x406cb1d0, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x4269d2 <ast_unregister_thread>
        __cancel_arg = (void *) 0x406cb940
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0x2aaab4fdf80f <do_monitor>, data = 0x0, 
  name = 0x2aaaab042fb0 "do_monitor", ' ' <repeats 11 times>, "started at [15424] chan_sip.c restart_monitor()"}
---Type <return> to continue, or q <return> to quit---
        lock_info = (struct thr_lock_info *) 0x78d2b0
#8  0x00002b9c8b58d193 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#9  0x00002b9c8be3845d in clone () from /lib64/libc.so.6
No symbol table info available.
#10 0x0000000000000000 in ?? ()
No symbol table info available.
(gdb)