(gdb) bt full
#0  chan_pjsip_digit_end (ast=<optimized out>, digit=<optimized out>, duration=100) at chan_pjsip.c:1627
        channel = 0x0
        pvt = <error reading variable pvt (Cannot access memory at address 0x0)>
        media = <optimized out>
        __PRETTY_FUNCTION__ = "chan_pjsip_digit_end"
#1  0x00000000004c0acf in ast_senddigit_end (duration=100, digit=51 '3', chan=0x7f22c011d858) at channel.c:4875
        res = -1
#2  ast_senddigit (chan=chan@entry=0x7f22c011d858, digit=<optimized out>, duration=<optimized out>) at channel.c:4896
No locals.
#3  0x00007f22a415c0e5 in manager_play_dtmf (s=0x7f23138ce280, m=0x7f23138ce790) at app_senddtmf.c:172
        channel = <optimized out>
        digit = 0x7f22f816a357 "3"
        duration = 0x7f22f802ea0a "100"
        chan = 0x7f22c011d858
        duration_ms = 100
#4  0x00000000005411f8 in process_message (s=s@entry=0x7f23138ce280, m=m@entry=0x7f23138ce790) at manager.c:6205
        acted = 0
        ret = 0
        act_found = 0x1b03a38
        user = <optimized out>
        action = 0x7f22f801e748 "PlayDTMF"
        __PRETTY_FUNCTION__ = "process_message"
#5  0x00000000005446ec in do_message (s=0x7f23138ce280) at manager.c:6418
        m = {hdrcount = 5, headers = {0x7f22f801e740 "action: PlayDTMF", 0x7f22f80ecf20 "actionid: 1588734527_8366897#", 0x7f22f802ea00 "duration: 100", 0x7f22f801e020 "channel: PJSIP/vos7_113_pstn-0000a270", 
            0x7f22f816a350 "digit: 3", 0x0 <repeats 123 times>}}
        idx = <optimized out>
        hdr_loss = 0
        header_buf = "\000igit: 3\000PJSIP/vos7_113_pstn-0000a270", '\000' <repeats 987 times>
        res = <optimized out>
        now = 1545162001
#6  session_do (data=0x7f23200017e8) at manager.c:6539
        ser = 0x7f23200017e8
        session = 0x7f22f8000ad8
        s = {session = 0x7f22f8000ad8, tcptls_session = 0x7f23200017e8, f = 0x7f22f8000960, fd = 13, parsing = MESSAGE_OKAY, write_error = 0, hook = 0x0, lock = {mutex = {__data = {__lock = 0, __count = 0, __owner = 0, 
                __nusers = 0, __kind = 1, __spins = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 16 times>, "\001", '\000' <repeats 22 times>, __align = 0}, track = 0x0, tracking = 0}}
        flags = <optimized out>
        res = 0
        ser_remote_address_tmp = {ss = {ss_family = 2, __ss_align = 0, __ss_padding = '\000' <repeats 111 times>}, len = 16}
        p = <optimized out>
        __PRETTY_FUNCTION__ = "session_do"
#7  0x00000000005ccb2d in handle_tcptls_connection (data=data@entry=0x7f23200017e8) at tcptls.c:695
        tcptls_session = 0x7f23200017e8
        ssl_setup = <optimized out>
        ret = <optimized out>
        err = "\201\023s\354܀\377\377\003", '\000' <repeats 23 times>, "\060\000\000\000[\000\000\000\200\354\214\023#\177", '\000' <repeats 18 times>, "n\000\000\000w", '\000' <repeats 11 times>, "\177\354\214\023#\177", '\000' <repeats 18 times>, "P\377\377\377\377\377\377\377|\000\000\000\000\000\000\000 \000\000\000\000\000\000\000 \000\000\000\000\000\000\000\000\367\214\023#\177\000\000\000\300\a\000\000\000\000\000\333F\274t#\177\000\000P\377\377\377\377\377\377\377 \000\000\370\"\177\000\000`\031\000 #\177\000\000P\a\002\000\000\000\000\000 \000\000\000\000\000\000\000\260"...
        __PRETTY_FUNCTION__ = "handle_tcptls_connection"
#8  0x00000000005db80a in dummy_start (data=<optimized out>) at utils.c:1237
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {139788837460320, -826701935174666607, 0, 139788628588992, 139788628588288, 507904, 774849902492071569, -826702712926554479}, __mask_was_saved = 0}}, 
          __pad = {0x7f23138cedf0, 0x0, 0x0, 0x0}}
---Type <return> to continue, or q <return> to quit--- 
        __cancel_arg = 0x7f23138cf700
        __not_first_call = <optimized out>
        ret = <optimized out>
        a = {start_routine = 0x5cc880 <handle_tcptls_connection>, data = 0x7f23200017e8, name = 0x7f2320001960 "handle_tcptls_connection started at [  746] tcptls.c ast_tcptls_server_root()"}
#9  0x00007f2375955dc5 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#10 0x00007f2374c416ed in clone () from /lib64/libc.so.6
No symbol table info available.