[SR-Users] Kamailio stop to process incoming SIP traffic via TCP.

Joel Serrano joel at textplus.com
Fri Mar 22 21:22:24 CET 2019


To make it easier for you and not have to go through the whole thread, if
you want the TL;DR start here:
https://github.com/kamailio/kamailio/issues/1172#issuecomment-312634272

On Fri, Mar 22, 2019 at 1:19 PM Joel Serrano <joel at textplus.com> wrote:

> Hi Aymeric,
>
> Are you sure the issue is with TCP and not strictly related to TLS? I
> highly suggest you compile with ssl1.0 and give it a try...
>
> If you want to read how I got to that conclusion:
> https://github.com/kamailio/kamailio/issues/1172
>
> Hope it helps!
> Joel.
>
>
>
>
>
>
>
> On Fri, Mar 22, 2019 at 11:58 AM Aymeric Moizard <amoizard at gmail.com>
> wrote:
>
>> Hi Daniel,
>>
>> Tks for the tips.
>>
>> My traffic does include TLS as well.
>>
>> For TCP settings:
>>
>> tcp_connection_lifetime=3600
>> tcp_async=yes
>> tcp_rd_buf_size=16384
>> tcp_accept_no_cl=yes
>> tcp_max_connections=50000
>> tcp_connect_timeout=7
>>
>> For TLS:
>> enable_tls=yes
>> tls_max_connections=50000
>>
>> I'm using "set_forward_no_connect();" after lookup(location) since a long
>> time.
>>
>> I have added this week "set_reply_no_connect();" in case it will help to
>> avoid the issue.
>>
>> If the issue occurs, I will try to get something via "kamctrl trap".
>>
>> In order to get a coredump (on restart timeout?) I have added this in
>> my kamailio.service
>>
>> WorkingDirectory=/var/run/kamailio
>> LimitCORE=infinity
>>
>> I have also DUMP_CORE=yes in /etc/default/kamailio
>> and disable_core_dump=no in my kamailio.cfg
>>
>> However, I'm not able to see any core dumps when restarting kamailio
>> even when I see "sig_alarm_abort(): shutdown timeout triggered, dying"...
>>
>> Am I supposed to get a core dump in such case?
>>
>> Tks a lot!
>> Aymeric
>>
>> Le ven. 22 mars 2019 à 14:19, Daniel-Constantin Mierla <miconda at gmail.com>
>> a écrit :
>>
>>> Do you have pure tcp traffic and facing this issue, or there are
>>> actually tls connections?
>>>
>>> What are the values for core parameters related to tcp connect and tcp
>>> send timeouts?
>>>
>>> As for restart taking long, see exit_timeout parameter:
>>>
>>>   * https://www.kamailio.org/wiki/cookbooks/5.2.x/core#exit_timeout
>>>
>>> As for tls with libssl1.1/libcrypto1.1, I think I discover what the
>>> issue is. With v1.1 they use their own internal locking functions, not
>>> exposing any api to set them from outside. Before, kamailio was
>>> initializing the libray telling to use Kamailio locks, giving one lock per
>>> connection. As i could get from some gdb traces I received, with libssl
>>> 1.1, the same internal lock is used for when attempting to connect to
>>> different addresses as well as when trying to write to different
>>> connections. If one operation is slow for what so ever reason, the others
>>> are waiting for the lock to be lifted by the slow operation. I am digging
>>> in the source code of libssl1.1 to figure out a solution, it can still take
>>> a bit because I am travelling for several days with no much spare time.
>>>
>>> Among the tunnings would be lower timeouts to connect and send, do not
>>> attempt to connect unless you are sure the target expects new connections
>>> (e.g., sending to a gateway/sip server accepting traffic via tls, but don't
>>> do it even for the requests routed via lookup(location) as the registration
>>> is using a connection with an ephemeral source port and trying to connect
>>> back to it will fail). If still a major issue for what so ever reason,
>>> using a version compiled with libssl1.0 would be something to go for it.
>>>
>>> Cheers,
>>> Daniel
>>> On 21.03.19 19:17, Aymeric Moizard wrote:
>>>
>>> Hi List,
>>>
>>> I want to share that I also met this issue last week with my kamailio
>>> 5.2.2.
>>>
>>> As far as I was able to see, SIP application were able to "connect()"
>>> with TCP, but my logs wasn't reporting any of the SIP message received
>>> with TCP.
>>>
>>> I have an pike right before an xlog showing every incoming request.
>>> However
>>> I suspect the issue was not related to pike module. The log didn't
>>> showed unusual
>>> number of blocked traffic.
>>>
>>> I'm almost sure I haven't reached any ulimit restrictions.
>>> I have many TCP, UDP childreen...
>>> Server was not under high load
>>> Nothing unusual.
>>>
>>> I'm running the default build for debian stretch from here:
>>>    http://deb.kamailio.org/kamailio52 stretch
>>>
>>> And unfortunatly, I had some tiny pressure to restart the service so I
>>> was
>>> not able to get deeper into the issue.
>>>
>>> If I'm correct, I will certainly improve much things by using
>>> "set_reply_no_connect()".
>>> I have added it and restarted!
>>> (Tks Daniel for this tip!)
>>>
>>> I have been looking at issue reported here:
>>> "Kamailio 5.0.2 suddenly stops processing traffic, then generates a core
>>> when restarting."
>>> https://github.com/kamailio/kamailio/issues/1172
>>>
>>> I have to say that I do have libssl1.1.
>>> And I do have crash when I restart my kamailio. (even when I simply
>>> restart after a configuration modification)
>>>
>>> Mar 21 18:28:50 sip kamailio[19222]: INFO: <core> [main.c:836]:
>>> sig_usr(): signal 15 received
>>> Mar 21 18:28:50 sip kamailio[19175]: ERROR: ctl [ctl.c:390]:
>>> mod_destroy(): ERROR: ctl: could not delete unix socket
>>> /var/run/kamailio/kamailio_ctl: Permission denied (13)
>>>
>>> [... one minute without nothing...]
>>>
>>> Mar 21 18:29:42 sip kamailio[19175]: ERROR: jsonrpcs
>>> [jsonrpcs_fifo.c:599]: jsonrpc_fifo_destroy(): FIFO stat failed: Permission
>>> denied
>>> Mar 21 18:29:42 sip kamailio[19175]: ERROR: jsonrpcs
>>> [jsonrpcs_sock.c:516]: jsonrpc_dgram_destroy(): socket stat failed:
>>> Permission denied
>>> Mar 21 18:29:50 sip kamailio[19175]: CRITICAL: <core> [main.c:662]:
>>> sig_alarm_abort(): shutdown timeout triggered, dying...
>>>
>>> As the 1172 issue is closed, should I expect kamailio to still have
>>> trouble with libssl1.1?
>>>
>>> I just restarted again my service (to see if it restart better after 30
>>> minutes only instead of a week)
>>>
>>> Mar 21 19:07:30 sip kamailio[28737]: INFO: <core> [main.c:836]:
>>> sig_usr(): signal 15 received
>>> Mar 21 19:07:31 sip kamailio[28671]: ERROR: ctl [ctl.c:390]:
>>> mod_destroy(): ERROR: ctl: could not delete unix socket
>>> /var/run/kamailio/kamailio_ctl: Permission denied (13)
>>>
>>> [... one minute without nothing...]
>>>
>>> Mar 21 19:08:30 sip kamailio[28671]: CRITICAL: <core> [main.c:662]:
>>> sig_alarm_abort(): shutdown timeout triggered, dying...
>>>
>>> Still not able to restart in a clean way!
>>> Tks!
>>> Regards
>>> Aymeric
>>>
>>>
>>> Le mer. 20 mars 2019 à 15:08, Daniel-Constantin Mierla <
>>> miconda at gmail.com> a écrit :
>>>
>>>> Hello,
>>>>
>>>> based on the trap output I think I could figure out what happened there.
>>>>
>>>> You have tcp_children to very low value (1 or so), the problem is not
>>>> actually that one, but the fact that the connection to upstream (the
>>>> device/app sending the request) was closed after receiving the request
>>>> and routing of the reply gets stuck in the way of:
>>>>
>>>>   - a reply is received and has to be forwarded
>>>>   - connection was lost, so Kamailio tries to establish a new one, but
>>>> takes time till fails because the upstream is behind nat or so based on
>>>> the via header:
>>>>
>>>> Via: SIP/2.0/TLS
>>>> 10.1.0.4:10002
>>>> ;rport=55229;received=13.94.188.218;branch=z9hG4bK-3336-7f2927bfd703ae907348edff3611bfc9
>>>>
>>>>   - the reply is retransmitted and gets to another worker, which tries
>>>> to forward it again, but discovers a connection structure for that
>>>> destination exists (created by previous reply worker) and now waits for
>>>> the connection to be released (or better said, for the mutex on writing
>>>> buffer to be unlocked)
>>>>
>>>>   - as the second reply waits, there can be other retransmissions of the
>>>> reply ending up in other workers stuck on waiting for the mutex of the
>>>> connection write buffer
>>>>
>>>> The solution here is to use set_reply_no_connect() -- you can put it
>>>> first in request_route block. I think this would be a good addition to
>>>> the default configuration file as well, IMO, the sip server should not
>>>> connect for sending replies and should do it also for requests that go
>>>> behind nat.
>>>>
>>>> Cheers,
>>>> Daniel
>>>>
>>>> On 19.03.19 10:53, Kristijan Vrban wrote:
>>>> > So i had again the situation. But this time, incoming udp was
>>>> > affected. Kamailio was sending out OPTIONS (via dispatcher module) to
>>>> > a group of asterisk machines
>>>> > but the 200 OK reply to the OPTIONS where not processed, so the
>>>> > dispatcher module set all asterisk to inactive, even though they
>>>> > replied 200 OK
>>>> >
>>>> > Attached the output of kamctl trap during the situation. Hope there is
>>>> > any useful in it. Because after "kamctl trap" it was working again
>>>> > without kamailio restart.
>>>> >
>>>> > Best
>>>> > Kristijan
>>>> >
>>>> > Am Mo., 18. März 2019 um 12:27 Uhr schrieb Daniel-Constantin Mierla
>>>> > <miconda at gmail.com>:
>>>> >> Hello,
>>>> >>
>>>> >> setting tcp_children=1 is not a god option for scallability,
>>>> practically
>>>> >> you set kamailio to process a single tcp message at one time, on high
>>>> >> traffic, that won't work well.
>>>> >>
>>>> >> Maybe try to set tcp_children to 2 or 4, that should make an eventual
>>>> >> race appear faster.
>>>> >>
>>>> >> Regarding the pid, if it is an outgoing connection, then it can be
>>>> >> created by any worker process, including a UDP worker, if that was
>>>> the
>>>> >> one receiving the sip message over udp and sends it out via tcp.
>>>> >>
>>>> >> Cheers,
>>>> >> Daniel
>>>> >>
>>>> >> On 18.03.19 10:09, Kristijan Vrban wrote:
>>>> >>> Hi Daniel,
>>>> >>>
>>>> >>> for testing, i now had set: "tcp_children=1" and so far this issue
>>>> did not occur
>>>> >>> ever since. So now value to provide for "kamctl trap" yet.
>>>> >>>
>>>> >>> "kamctl ps" show this two process to handle tcp:
>>>> >>>
>>>> >>> ...
>>>> >>>     }, {
>>>> >>>       "IDX":  25,
>>>> >>>       "PID":  71929,
>>>> >>>       "DSC":  "tcp receiver (generic) child=0"
>>>> >>>     }, {
>>>> >>>       "IDX":  26,
>>>> >>>       "PID":  71933,
>>>> >>>       "DSC":  "tcp main process"
>>>> >>>     }
>>>> >>> ...
>>>> >>>
>>>> >>>
>>>> >>> Ok, but then is was wondering to see a TCP connection on a udp
>>>> receiver child:
>>>> >>>
>>>> >>>
>>>> >>> netstat -ntp |grep 5061
>>>> >>>
>>>> >>> ...
>>>> >>> tcp        0      0 172.17.217.10:5061      195.70.114.125:18252
>>>> >>> ESTABLISHED 71895/kamailio
>>>> >>> ...
>>>> >>>
>>>> >>> An pid 71895 is:
>>>> >>>
>>>> >>> }, {
>>>> >>>       "IDX":  3,
>>>> >>>       "PID":  71895,
>>>> >>>       "DSC":  "udp receiver child=2 sock=127.0.0.1:5060"
>>>> >>>     }, {
>>>> >>>
>>>> >>>
>>>> >>>
>>>> >>> And if i look into it via "lsof -p 71895" (the udp receiver child)
>>>> >>>
>>>> >>> ...
>>>> >>> kamailio 71895 kamailio   14u  sock                0,9      0t0
>>>> >>> 8856085 protocol: TCP
>>>> >>> kamailio 71895 kamailio   15u  sock                0,9      0t0
>>>> >>> 8886886 protocol: TCP
>>>> >>> kamailio 71895 kamailio   16u  sock                0,9      0t0
>>>> >>> 8854886 protocol: TCP
>>>> >>> kamailio 71895 kamailio   17u  sock                0,9      0t0
>>>> >>> 8828915 protocol: TCP
>>>> >>> kamailio 71895 kamailio   18u  unix 0x000000005f73cb91      0t0
>>>> >>> 1680314 type=DGRAM
>>>> >>> kamailio 71895 kamailio   19u  IPv4            1846523      0t0
>>>> >>> TCP kamailio-preview:sip-tls->XXX:18252 (ESTABLISHED)
>>>> >>> kamailio 71895 kamailio   20u  sock                0,9      0t0
>>>> >>> 8887192 protocol: TCP
>>>> >>> kamailio 71895 kamailio   21u  sock                0,9      0t0
>>>> >>> 8813634 protocol: TCP
>>>> >>> kamailio 71895 kamailio   22u  unix 0x00000000c19bd102      0t0
>>>> >>> 1681407 type=STREAM
>>>> >>> kamailio 71895 kamailio   23u  sock                0,9      0t0
>>>> >>> 8850488 protocol: TCP
>>>> >>> ...
>>>> >>>
>>>> >>> Not only the ESTABLISHED TCP session. But also this empty sockets
>>>> >>> "protocol: TCP"
>>>> >>> What are they doing there in the udp receiver? Is that how it's
>>>> supposed to be?
>>>> >>>
>>>> >>> Kristijan
>>>> >>>
>>>> >>> Am Do., 14. März 2019 um 14:48 Uhr schrieb Daniel-Constantin Mierla
>>>> >>> <miconda at gmail.com>:
>>>> >>>> Can you get file written by `kamctl trap`? It should have the
>>>> backtrace
>>>> >>>> for all kamailio processes. You need latest kamailio 5.2.
>>>> >>>>
>>>> >>>> Also, get the output for: kamctl ps
>>>> >>>>
>>>> >>>> Cheers,
>>>> >>>> Daniel
>>>> >>>>
>>>> >>>> On 14.03.19 13:52, Kristijan Vrban wrote:
>>>> >>>>> When i attach via gdb to one of the tcp worker, i see this:
>>>> >>>>>
>>>> >>>>> (gdb) bt
>>>> >>>>> #0  0x00007fdaf4d14470 in futex_wait (private=<optimized out>,
>>>> >>>>> expected=1, futex_word=0x7fdaeca92f8c) at
>>>> >>>>> ../sysdeps/unix/sysv/linux/futex-internal.h:61
>>>> >>>>> #1  futex_wait_simple (private=<optimized out>, expected=1,
>>>> >>>>> futex_word=0x7fdaeca92f8c) at ../sysdeps/nptl/futex-internal.h:135
>>>> >>>>> #2  __pthread_rwlock_wrlock_slow (rwlock=0x7fdaeca92f80) at
>>>> >>>>> pthread_rwlock_wrlock.c:67
>>>> >>>>> #3  0x00007fdaf0912ee9 in CRYPTO_THREAD_write_lock () from
>>>> >>>>> /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
>>>> >>>>> #4  0x00007fdaf08e1c08 in ?? () from
>>>> /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
>>>> >>>>> #5  0x00007fdaf08a6f69 in ?? () from
>>>> /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
>>>> >>>>> #6  0x00007fdaf08b36c7 in EVP_CIPHER_CTX_ctrl () from
>>>> >>>>> /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
>>>> >>>>> #7  0x00007fdaf0c31144 in ?? () from
>>>> /usr/lib/x86_64-linux-gnu/libssl.so.1.1
>>>> >>>>> #8  0x00007fdaf0c2bddb in ?? () from
>>>> /usr/lib/x86_64-linux-gnu/libssl.so.1.1
>>>> >>>>> #9  0x00007fdaf0c22858 in ?? () from
>>>> /usr/lib/x86_64-linux-gnu/libssl.so.1.1
>>>> >>>>> #10 0x00007fdaf0c1af61 in SSL_do_handshake () from
>>>> >>>>> /usr/lib/x86_64-linux-gnu/libssl.so.1.1
>>>> >>>>> #11 0x00007fdaf0e8d31b in tls_accept (c=0x7fdaed26fa98,
>>>> >>>>> error=0x7ffffe2a2df0) at tls_server.c:422
>>>> >>>>> #12 0x00007fdaf0e96a1b in tls_read_f (c=0x7fdaed26fa98,
>>>> >>>>> flags=0x7ffffe2c318c) at tls_server.c:1116
>>>> >>>>> #13 0x0000556ead5e7c46 in tcp_read_headers (c=0x7fdaed26fa98,
>>>> >>>>> read_flags=0x7ffffe2c318c) at core/tcp_read.c:469
>>>> >>>>> #14 0x0000556ead5ef9cb in tcp_read_req (con=0x7fdaed26fa98,
>>>> >>>>> bytes_read=0x7ffffe2c3184, read_flags=0x7ffffe2c318c) at
>>>> >>>>> core/tcp_read.c:1496
>>>> >>>>> #15 0x0000556ead5f575f in handle_io (fm=0x7fdaf597aa98, events=1,
>>>> >>>>> idx=-1) at core/tcp_read.c:1862
>>>> >>>>> #16 0x0000556ead5e2053 in io_wait_loop_epoll (h=0x556eadaaeec0
>>>> <io_w>,
>>>> >>>>> t=2, repeat=0) at core/io_wait.h:1065
>>>> >>>>> #17 0x0000556ead5f6b35 in tcp_receive_loop (unix_sock=49) at
>>>> >>>>> core/tcp_read.c:1974
>>>> >>>>> #18 0x0000556ead4c8e24 in tcp_init_children () at
>>>> core/tcp_main.c:4853
>>>> >>>>> #19 0x0000556ead3c352a in main_loop () at main.c:1735
>>>> >>>>> #20 0x0000556ead3ca5f8 in main (argc=13, argv=0x7ffffe2c3828) at
>>>> main.c:2675
>>>> >>>>>
>>>> >>>>>
>>>> >>>>>
>>>> >>>>>
>>>> >>>>>
>>>> >>>>>
>>>> >>>>>
>>>> >>>>> Am Do., 14. März 2019 um 13:41 Uhr schrieb Kristijan Vrban
>>>> >>>>> <vrban.lkml at gmail.com>:
>>>> >>>>>> Hi, with full debug is see this in log for every incoming TCP
>>>> SIP request:
>>>> >>>>>>
>>>> >>>>>> Mar 14 12:10:15 kamailio-preview /usr/sbin/kamailio[17940]:
>>>> DEBUG:
>>>> >>>>>> <core> [core/tcp_main.c:3871]: send2child(): WARNING: no free tcp
>>>> >>>>>> receiver, connection passed to the least busy one (105)
>>>> >>>>>> Mar 14 12:10:15 kamailio-preview /usr/sbin/kamailio[17940]:
>>>> DEBUG:
>>>> >>>>>> <core> [core/tcp_main.c:3875]: send2child(): selected tcp worker
>>>> 2
>>>> >>>>>> 27(17937) for activity on [tls:172.17.217.10:5061],
>>>> 0x7fdaeda8f928
>>>> >>>>>>
>>>> >>>>>> So the Kamailio TCP process is working, and received TCP
>>>> traffic. But
>>>> >>>>>> the tcp workers are somehow busy.
>>>> >>>>>>
>>>> >>>>>> When i attach via strace to the TCP worker, i do not see any
>>>> activity. Just:
>>>> >>>>>>
>>>> >>>>>> futex(0x7fdaeca92f8c, FUTEX_WAIT_PRIVATE, 1, NULL
>>>> >>>>>>
>>>> >>>>>> and nothing, even when i see the main tcp process choose this
>>>> worker process.
>>>> >>>>>>
>>>> >>>>>> Kristijan
>>>> >>>>>>
>>>> >>>>>> Am Mi., 27. Feb. 2019 um 15:14 Uhr schrieb Kristijan Vrban
>>>> >>>>>> <vrban.lkml at gmail.com>:
>>>> >>>>>>> first of all thanks for the feedback. i prepared our system now
>>>> to run
>>>> >>>>>>> with debug=3
>>>> >>>>>>> I hope to see more then then.
>>>> >>>>>>>
>>>> >>>>>>> Am Mi., 27. Feb. 2019 um 11:53 Uhr schrieb Kristijan Vrban
>>>> >>>>>>> <vrban.lkml at gmail.com>:
>>>> >>>>>>>> Hi kamailios,
>>>> >>>>>>>>
>>>> >>>>>>>> i have a creepy situation with v5.2.1 stable Kamilio. After a
>>>> day or
>>>> >>>>>>>> so, Kamailio stop to process incoming SIP traffic via TCP. The
>>>> >>>>>>>> incoming TCP network packages get TCP-ACK from the OS (Debian
>>>> 9,
>>>> >>>>>>>> 4.18.0-15-generic-Linux) but Kamailio does not show any
>>>> processing for
>>>> >>>>>>>> the SIP-Traffic incoming via TCP. No logs, nothing. While
>>>> traffic via
>>>> >>>>>>>> UDP is working just totally fine.
>>>> >>>>>>>>
>>>> >>>>>>>> When i look via command "netstat -ntp" is see, that the Recv-Q
>>>> get
>>>> >>>>>>>> bigger and bigger. e.g.:
>>>> >>>>>>>>
>>>> >>>>>>>> Proto Recv-Q Send-Q Local Address Foreign Address State
>>>> PID/Program
>>>> >>>>>>>> name tcp 4566 0 172.17.217.12:5060 xxx.xxx.xxx.xxx:57252
>>>> ESTABLISHED
>>>> >>>>>>>> 31347/kamailio
>>>> >>>>>>>>
>>>> >>>>>>>> After Kamailio restart, all is working fine again for a day.
>>>> We have
>>>> >>>>>>>> maybe 10-20 devices online via TCP and low call volume (1-2
>>>> call per
>>>> >>>>>>>> minute). The only settings for tcp we have is
>>>> "tcp_delayed_ack=no"
>>>> >>>>>>>>
>>>> >>>>>>>> How to could we debug this situation? Again, no error, no
>>>> warings in
>>>> >>>>>>>> the log. Just nothing.
>>>> >>>>>>>>
>>>> >>>>>>>> Kristijan
>>>> >>>>> _______________________________________________
>>>> >>>>> Kamailio (SER) - Users Mailing List
>>>> >>>>> sr-users at lists.kamailio.org
>>>> >>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>> >>>> --
>>>> >>>> Daniel-Constantin Mierla -- www.asipto.com
>>>> >>>> www.twitter.com/miconda -- www.linkedin.com/in/miconda
>>>> >>>> Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com
>>>> >>>> Kamailio Advanced Training - Mar 25-27, 2019, in Washington, DC,
>>>> USA -- www.asipto.com
>>>> >>>>
>>>> >>> _______________________________________________
>>>> >>> Kamailio (SER) - Users Mailing List
>>>> >>> sr-users at lists.kamailio.org
>>>> >>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>> >> --
>>>> >> Daniel-Constantin Mierla -- www.asipto.com
>>>> >> www.twitter.com/miconda -- www.linkedin.com/in/miconda
>>>> >> Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com
>>>> >> Kamailio Advanced Training - Mar 25-27, 2019, in Washington, DC, USA
>>>> -- www.asipto.com
>>>> >>
>>>> --
>>>> Daniel-Constantin Mierla -- www.asipto.com
>>>> www.twitter.com/miconda -- www.linkedin.com/in/miconda
>>>> Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com
>>>> Kamailio Advanced Training - Mar 25-27, 2019, in Washington, DC, USA --
>>>> www.asipto.com
>>>>
>>>>
>>>> _______________________________________________
>>>> Kamailio (SER) - Users Mailing List
>>>> sr-users at lists.kamailio.org
>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>>
>>>
>>>
>>> --
>>> Antisip - http://www.antisip.com
>>>
>>> --
>>> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
>>> Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com
>>> Kamailio Advanced Training - Mar 25-27, 2019, in Washington, DC, USA -- www.asipto.com
>>>
>>>
>>
>> --
>> Antisip - http://www.antisip.com
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>
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