#0  0x00007f97fd90661c in _sip_tcp_helper_thread (pvt=0x0, tcptls_session=0x0) at chan_sip.c:2715
        res = 3
        cl = 32664
        timeout = -1
        authenticated = 0
        flags = 0
        start = 0
        req = {rlPart1 = 0, rlPart2 = 0, len = 0, headers = 0, method = 0, lines = 0, sdp_start = 0, sdp_count = 0, debug = 0 '\000',
          has_to_tag = 0 '\000', ignore = 0 '\000', authenticated = 0 '\000', header = {0 <repeats 64 times>}, line = {0 <repeats 256 times>}, data = 0x0,
          content = 0x0, socket = {type = 0, fd = 0, port = 0, tcptls_session = 0x0}, next = {next = 0x0}}
        reqcpy = {rlPart1 = 0, rlPart2 = 0, len = 0, headers = 0, method = 0, lines = 0, sdp_start = 0, sdp_count = 0, debug = 0 '\000',
          has_to_tag = 0 '\000', ignore = 0 '\000', authenticated = 0 '\000', header = {0 <repeats 64 times>}, line = {0 <repeats 256 times>}, data = 0x0,
          content = 0x0, socket = {type = 0, fd = 0, port = 0, tcptls_session = 0x0}, next = {next = 0x0}}
        me = 0x7f97e22c0528
        buf = '\000' <repeats 1023 times>
        fds = {{fd = 0, events = 0, revents = 0}, {fd = 0, events = 0, revents = 0}}
        ca = 0x7f97e22bdeb8
        __PRETTY_FUNCTION__ = "_sip_tcp_helper_thread"
#1  0x00007f97fd90533a in sip_tcp_worker_fn (data=0x7f97e22becb8) at chan_sip.c:2426
        tcptls_session = 0x7f97e22becb8
#2  0x0000000000559166 in dummy_start (data=0x7f97e22bc7c0) at utils.c:971
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {0, 4040416971733493396, 140733781182880, 0, 140290943889472, 3, 4040416971741882004,
                -4089908576747755884}, __mask_was_saved = 0}}, __pad = {0x7f97e4574f80, 0x0, 0x0, 0x0}}
        __cancel_routine = 0x437f34 <ast_unregister_thread>
        __cancel_arg = 0x7f97e4575700
        not_first_call = 0
        ret = 0x0
        a = {start_routine = 0x7f97fd905315 <sip_tcp_worker_fn>, data = 0x7f97e22becb8,
          name = 0x7f97e22bc7e0 "sip_tcp_worker_fn    started at [24348] chan_sip.c sip_prepare_socket()"}
#3  0x00007f980711a8ba in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#4  0x00007f980795302d in clone () from /lib/libc.so.6
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.
(gdb)