#0  0x00000000004a1637 in __ast_queue_frame (chan=0x0, fin=fin@entry=0x7fffa083f8a0, head=head@entry=0, after=after@entry=0x0) at channel.c:1105
        f = <optimized out>
        cur = <optimized out>
        new_frames = 0
        new_voice_frames = 0
        queued_frames = 0
        queued_voice_frames = 0
        frames = <optimized out>
        __PRETTY_FUNCTION__ = "__ast_queue_frame"
#1  0x00000000004a53ff in ast_queue_frame (fin=0x7fffa083f8a0, chan=<optimized out>) at channel.c:1208
No locals.
#2  ast_queue_control (chan=<optimized out>, control=control@entry=AST_CONTROL_SRCCHANGE) at channel.c:1293
        f = {frametype = AST_FRAME_CONTROL, subclass = {integer = 26, format = {id = 26, fattr = {format_attr = {0 <repeats 64 times>}, 
                rtp_marker_bit = 0 '\000'}}}, datalen = 0, samples = 0, mallocd = 0, mallocd_hdr_len = 0, offset = 0, src = 0x0, data = {ptr = 0x0, 
            uint32 = 0, pad = "\000\000\000\000\000\000\000"}, delivery = {tv_sec = 0, tv_usec = 0}, frame_list = {next = 0x0}, flags = 0, ts = 0, 
          len = 0, seqno = 0}
#3  0x00007fff5b1cabc0 in chan_pjsip_incoming_ack (session=<optimized out>, rdata=<optimized out>) at chan_pjsip.c:2050
        rdata = <optimized out>
        session = <optimized out>
#4  0x00007fffa575f888 in handle_incoming_request (session=session@entry=0x7fff94008b78, rdata=rdata@entry=0x7fffd00067b8)
    at res_pjsip_session.c:1712
        supplement = 0x7fff94008ab0
        req = {method = {id = PJSIP_ACK_METHOD, name = {ptr = 0x7ffff40e9452 "ACK", slen = 3}}, uri = 0x7fffd0007b20}
        __PRETTY_FUNCTION__ = "handle_incoming_request"
#5  0x00007fffa575fb3e in handle_incoming (session=session@entry=0x7fff94008b78, rdata=0x7fffd00067b8) at res_pjsip_session.c:1740
        __PRETTY_FUNCTION__ = "handle_incoming"
#6  0x00007fffa575fe11 in session_inv_on_state_changed (inv=0x7fff94007c88, e=0x7fffa083fb40) at res_pjsip_session.c:1836
        session = 0x7fff94008b78
        __PRETTY_FUNCTION__ = "session_inv_on_state_changed"
#7  0x00007ffff451cc90 in inv_set_state () from /usr/lib/libpjsip-ua.so
No symbol table info available.
#8  0x00007ffff451d227 in mod_inv_on_rx_request () from /usr/lib/libpjsip-ua.so
No symbol table info available.
#9  0x00007ffff40e572a in pjsip_dlg_on_rx_request () from /usr/lib/libpjsip.so
No symbol table info available.
#10 0x00007ffff40e6dd3 in mod_ua_on_rx_request () from /usr/lib/libpjsip.so
No symbol table info available.
#11 0x00007ffff40cde47 in pjsip_endpt_process_rx_data () from /usr/lib/libpjsip.so
No symbol table info available.
#12 0x00007fffa44af1b9 in distribute (data=0x7fffd00067b8) at res_pjsip/pjsip_distributor.c:324
        param = {start_prio = 0, start_mod = 0x7fffa46b96e0 <distributor_mod>, idx_after_start = 1, silent = 0}
        handled = 0
        rdata = 0x7fffd00067b8
        is_request = 1
        is_ack = 1
        endpoint = <optimized out>
#13 0x00000000005bbb0b in ast_taskprocessor_execute (tps=tps@entry=0x7fff94002778) at taskprocessor.c:769
        local = {local_data = 0xe21bb8, data = 0x4595bf <__ao2_unlock+319>}
        t = 0x7fffd0002d90
#14 0x00000000005c40e0 in execute_tasks (data=0x7fff94002778) at threadpool.c:1152
        tps = 0x7fff94002778
#15 0x00000000005bbb0b in ast_taskprocessor_execute (tps=0xe1c2f8) at taskprocessor.c:769
        local = {local_data = 0x19c000a80, data = 0x4595bf <__ao2_unlock+319>}
        t = 0x7fffd0002dc0
#16 0x00000000005c48f8 in threadpool_execute (pool=0xe1e958) at threadpool.c:351
No locals.
#17 worker_active (worker=0x7fff9c000fa8) at threadpool.c:1072
No locals.
#18 worker_start (arg=arg@entry=0x7fff9c000fa8) at threadpool.c:992
        worker = 0x7fff9c000fa8
        __PRETTY_FUNCTION__ = "worker_start"
#19 0x00000000005cdf1a in dummy_start (data=<optimized out>) at utils.c:1169
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {140735810636416, 4982030095734578997, 1, 140737287761088, 17, 140735886395136, 
                -4981833317559001291, 4982029298850373429}, __mask_was_saved = 0}}, __pad = {0x7fffa083fec0, 0x0, 
            0x7ffff797da82 <__libc_thread_freeres+34>, 0x7ffff40b2cc0}}
        __cancel_arg = 0x7fffa0840700
        __not_first_call = <optimized out>
        ret = <optimized out>
        a = {start_routine = 0x5c4580 <worker_start>, data = 0x7fff9c000fa8, 
          name = 0x7fff9c000a80 "worker_start         started at [ 1046] threadpool.c worker_thread_start()"}
#20 0x00007ffff6125e0e in start_thread (arg=0x7fffa0840700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7fffa0840700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140735886395136, 4982030095734578997, 1, 140737287761088, 17, 140735886395136, 
                -4981833317538029771, -4982012678504538315}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, 
              cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#21 0x00007ffff79159ed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.