[SR-Users] Kamailio like SBC with Teams

Yuriy Nasida ynasida at gmail.com
Fri Apr 17 10:53:33 CEST 2020 

Probably. You can get full pcap files using tcpdump and check TLS
handshakes usign wireshark.
Also it is not really need to check cert on the side of kamailio. You can
set (at least for tests)
verify_certificate = no
require_certificate = no

On Fri, 17 Apr 2020 at 10:02, sip user <sipuser404 at gmail.com> wrote:

> Hi Sergiu..
>
> I've made many test and many change...
>
> In tls.cfg I have this:
>
> [server:default]
> method = TLSv1.2
> verify_certificate = yes
> require_certificate = yes
> private_key = /etc/letsencrypt/ssl/cert.key
> certificate = /etc/letsencrypt/ssl/cert.crt
> ca_list = /etc/letsencrypt/ssl/ca.crt
>
> [client:default]
> method = TLSv1.2
> verify_certificate = yes
> require_certificate = yes
> private_key = /etc/letsencrypt/ssl/cert.key
> certificate = /etc/letsencrypt/ssl/cert.crt
> ca_list = /etc/letsencrypt/ssl/ca.crt
>
> But when I make Kamcmd tls.list I have not response.. Not show me anything.
>
> Problem with certificated??
>
> Thanks
>
> El jue., 16 abr. 2020 a las 20:31, Sergiu Pojoga (<pojogas at gmail.com>)
> escribió:
>
>> Hi SIP User/anonymous/one-time-visitor/,
>>
>> Your TLS config isn't correct. The article clearly says
>> verify/require_certificate must be set to 'yes'
>>
>> *kamcmd tls.list*
>> Does it show any 'established' connections with MS proxy?
>>
>> Good luck,
>>
>> --Sergiu
>>
>> On Thu, Apr 16, 2020 at 11:41 AM Ovidiu Sas <osas at voipembedded.com>
>> wrote:
>>
>>> The tutorial is pretty clear:
>>> You need to add the Contact header only for OPTIONS pings.
>>> You need to use the proper Record-Route headers based on the direction
>>> of the call.
>>> There's no out of the box solution because each setup is different.
>>>
>>> If you understand how loose routing works in SIP, then you know how to
>>> adjust the config to use record_route_preset(), just as explained in
>>> the tutorial. There is also an example of an INVITE that has the right
>>> Record-Route headers in the tutorial.
>>>
>>> You can choose to use the FQDN for the Record-Route header facing MS
>>> and the IP for the Record-Route header facing the carrier or use the
>>> FQDN for both Record-Route headers (just like in the tutorialexample).
>>> Alternatively, one can try to advertise the FQDN in the listen
>>> directive in the config and then the Record-Route headers should be
>>> populated automatically.
>>>
>>> Regards,
>>> Ovidiu Sas
>>>
>>> On Thu, Apr 16, 2020 at 10:50 AM sip user <sipuser404 at gmail.com> wrote:
>>> >
>>> > Hi Nasida.. Thanks for answerd to me...
>>> >
>>> > I've activarted the debugger module, and I see the same:
>>> >
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [ip_addr.c:243]: print_ip(): tcpconn_new: new tcp connection: 52.114.7.24
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:1073]: tcpconn_new(): tcpconn_new: on port 4160, type 3
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:1382]: tcpconn_add(): tcpconn_add: hashes: 171:1857:1187, 30
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [io_wait.h:388]: io_watch_add(): DBG: io_watch_add(0xa1f240, 23, 2,
>>> 0x7f90f2438f80), fd_no=17
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [io_wait.h:610]: io_watch_del(): DBG: io_watch_del (0xa1f240, 23, -1, 0x0)
>>> fd_no=18 called
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:4219]: handle_tcpconn_ev(): tcp: DBG: sending to child, events 1
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:3902]: send2child(): selected tcp worker 1 10(23159) for
>>> activity on [tls:SBC_IP:5061], 0x7f90f2438f80
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1507]: handle_io(): received n=8 con=0x7f90f2438f80, fd=9
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: tls
>>> [tls_server.c:184]: tls_complete_init(): Using TLS domain TLSs<default>
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: tls
>>> [tls_domain.c:700]: sr_ssl_ctx_info_callback(): SSL handshake started
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_main.c:2516]: tcpconn_do_send(): tcp_send: sending...
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_main.c:2550]: tcpconn_do_send(): tcp_send: after real write: c=
>>> 0x7f90f2438f80 n=1468 fd=9
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_main.c:2551]: tcpconn_do_send(): tcp_send: buf=
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: #026#003#003
>>> > Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [io_wait.h:388]: io_watch_add(): DBG: io_watch_add(0x9c1700, 9, 2,
>>> 0x7f90f2438f80), fd_no=1
>>> > Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:296]: tcp_read_data(): EOF on 0x7f90f2438f80, FD 9
>>> > Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1291]: tcp_read_req(): tcp_read_req: EOF
>>> > Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [io_wait.h:610]: io_watch_del(): DBG: io_watch_del (0x9c1700, 9, -1, 0x10)
>>> fd_no=2 called
>>> > Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1434]: release_tcpconn(): releasing con 0x7f90f2438f80, state
>>> -1, fd=9, id=30
>>> > Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1435]: release_tcpconn():  extra_data 0x7f90f2432b40
>>> > Apr 15 11:11:42 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:3331]: handle_tcp_child(): handle_tcp_child: reader response=
>>> 7f90f2438f80, -1 from 1
>>> > Apr 15 11:11:42 vps793907 kamailio[23122]: 13(23167) DEBUG: tls
>>> [tls_server.c:604]: tls_h_close(): Closing SSL connection 0x7f90f2432b40
>>> >
>>> > I don't see any different.
>>> >
>>> > I know that the module is loaded because I see:
>>> >
>>> > exec: *** cfgtrace:request_route=[DEFAULT_ROUTE]
>>> c=[/etc/kamailio/kamailio.cfg] l=486 a=5 n=route
>>> >
>>> > When I restart kamailio, but when I "launch" a call from Teams to my
>>> Kamailio I only see that.
>>> >
>>> > To configure it, I follow
>>> https://skalatan.de/en/blog/kamailio-sbc-teams.. But I cannot make it
>>> works..
>>> >
>>> > Any more thing that i can test or do??
>>> >
>>> > Thanks
>>> >
>>> > El jue., 16 abr. 2020 a las 14:20, Nasida Yuriy (<nasida at live.ru>)
>>> escribió:
>>> >>
>>> >> Wow, so many people want to configure kamailio with MS. First of all
>>> i think you need to get sip debug  between kamailio and MS. Kamilio has
>>> module to save sip traces. This way you will get sip debug decrypted.
>>> >>
>>> >>
>>> >> ________________________________
>>> >> От: sr-users <sr-users-bounces at lists.kamailio.org> от имени sip user
>>> <sipuser404 at gmail.com>
>>> >> Отправлено: 16 апреля 2020 г. 10:19
>>> >> Кому: sr-users at lists.kamailio.org <sr-users at lists.kamailio.org>
>>> >> Тема: [SR-Users] Kamailio like SBC with Teams
>>> >>
>>> >> Hello good morning ... I am new to this list and I was starting to
>>> mess with Kamailio, mainly to set it up as SBC against Teams, in this case.
>>> >>
>>> >> But I can't get it to work for me. If I launch a call from the Teams,
>>> in the Kamailio I see:
>>> >>
>>> >> 1.- In syslog:
>>> >>
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [ip_addr.c:243]: print_ip(): tcpconn_new: new tcp connection: 52.114.7.24
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:1073]: tcpconn_new(): tcpconn_new: on port 4160, type 3
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:1382]: tcpconn_add(): tcpconn_add: hashes: 171:1857:1187, 30
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [io_wait.h:388]: io_watch_add(): DBG: io_watch_add(0xa1f240, 23, 2,
>>> 0x7f90f2438f80), fd_no=17
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [io_wait.h:610]: io_watch_del(): DBG: io_watch_del (0xa1f240, 23, -1, 0x0)
>>> fd_no=18 called
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:4219]: handle_tcpconn_ev(): tcp: DBG: sending to child, events 1
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:3902]: send2child(): selected tcp worker 1 10(23159) for
>>> activity on [tls:SBC_IP:5061], 0x7f90f2438f80
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1507]: handle_io(): received n=8 con=0x7f90f2438f80, fd=9
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: tls
>>> [tls_server.c:184]: tls_complete_init(): Using TLS domain TLSs<default>
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: tls
>>> [tls_domain.c:700]: sr_ssl_ctx_info_callback(): SSL handshake started
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_main.c:2516]: tcpconn_do_send(): tcp_send: sending...
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_main.c:2550]: tcpconn_do_send(): tcp_send: after real write: c=
>>> 0x7f90f2438f80 n=1468 fd=9
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_main.c:2551]: tcpconn_do_send(): tcp_send: buf=
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: #026#003#003
>>> >> Apr 15 11:11:41 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [io_wait.h:388]: io_watch_add(): DBG: io_watch_add(0x9c1700, 9, 2,
>>> 0x7f90f2438f80), fd_no=1
>>> >> Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:296]: tcp_read_data(): EOF on 0x7f90f2438f80, FD 9
>>> >> Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1291]: tcp_read_req(): tcp_read_req: EOF
>>> >> Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [io_wait.h:610]: io_watch_del(): DBG: io_watch_del (0x9c1700, 9, -1, 0x10)
>>> fd_no=2 called
>>> >> Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1434]: release_tcpconn(): releasing con 0x7f90f2438f80, state
>>> -1, fd=9, id=30
>>> >> Apr 15 11:11:42 vps793907 kamailio[23122]: 10(23159) DEBUG: <core>
>>> [tcp_read.c:1435]: release_tcpconn():  extra_data 0x7f90f2432b40
>>> >> Apr 15 11:11:42 vps793907 kamailio[23122]: 13(23167) DEBUG: <core>
>>> [tcp_main.c:3331]: handle_tcp_child(): handle_tcp_child: reader response=
>>> 7f90f2438f80, -1 from 1
>>> >> Apr 15 11:11:42 vps793907 kamailio[23122]: 13(23167) DEBUG: tls
>>> [tls_server.c:604]: tls_h_close(): Closing SSL connection 0x7f90f2432b40
>>> >>
>>> >> 2.- With TCPDUMP:
>>> >>
>>> >> 11:13:09.311797 IP SBC_IP .1024 > SBC_IP .eu.sip-tls: Flags [S], seq
>>> 261244614, win 64240, options [mss 1440,nop,wscale 8,nop,nop,sackOK],
>>> length 0
>>> >> 11:13:09.311898 IP  SBC_IP .eu.sip-tls > 52.114.76.76.1024: Flags
>>> [S.], seq 812357247, ack 261244615, win 29200, options [mss
>>> 1460,nop,nop,sackOK,nop,wscale 7], length 0
>>> >> 11:13:09.340358 IP 52.114.76.76.1024 >  SBC_IP .eu.sip-tls: Flags
>>> [.], ack 1, win 2053, length 0
>>> >> 11:13:09.340560 IP 52.114.76.76.1024 > SBC_IP .eu.sip-tls: Flags
>>> [P.], seq 1:187, ack 1, win 2053, length 186
>>> >> 11:13:09.340578 IP SBC_IP .eu.sip-tls > 52.114.76.76.1024: Flags [.],
>>> ack 187, win 237, length 0
>>> >> 11:13:09.341361 IP SBC_IP .eu.sip-tls > 52.114.76.76.1024: Flags
>>> [P.], seq 1:1469, ack 187, win 237, length 1468
>>> >> 11:13:09.369606 IP 52.114.76.76.1024 > SBC_IP .eu.sip-tls: Flags [.],
>>> ack 1469, win 2053, length 0
>>> >> 11:13:12.451498 IP 52.114.7.24.1216 > SBC_IP .eu.sip-tls: Flags [S],
>>> seq 309084204, win 64240, options [mss 1440,nop,wscale 8,nop,nop,sackOK],
>>> length 0
>>> >> 11:13:12.451587 IP SBC_IP .eu.sip-tls > 52.114.7.24.1216: Flags [S.],
>>> seq 3275066862, ack 309084205, win 29200, options [mss
>>> 1460,nop,nop,sackOK,nop,wscale 7], length 0
>>> >> 11:13:12.707119 IP 52.114.7.24.1216 > SBC_IP .eu.sip-tls: Flags [.],
>>> ack 1, win 2053, length 0
>>> >> 11:13:12.707311 IP 52.114.7.24.1216 > SBC_IP .eu.sip-tls: Flags [P.],
>>> seq 1:187, ack 1, win 2053, length 186
>>> >> 11:13:12.707345 IP SBC_IP .eu.sip-tls > 52.114.7.24.1216: Flags [.],
>>> ack 187, win 237, length 0
>>> >> 11:13:12.708273 IP SBC_IP .eu.sip-tls > 52.114.7.24.1216: Flags [P.],
>>> seq 1:1469, ack 187, win 237, length 1468
>>> >> 11:13:12.965101 IP 52.114.7.24.1216 > SBC_IP .eu.sip-tls: Flags [.],
>>> ack 1469, win 2053, length 0
>>> >> 11:13:12.965156 IP 52.114.7.24.1216 > SBC_IP .eu.sip-tls: Flags [F.],
>>> seq 187, ack 1469, win 2053, length 0
>>> >> 11:13:12.965688 IP SBC_IP .eu.sip-tls > 52.114.7.24.1216: Flags [F.],
>>> seq 1469, ack 188, win 237, length 0
>>> >> 11:13:13.220871 IP 52.114.7.24.1216 > SBC_IP .eu.sip-tls: Flags [.],
>>> ack 1470, win 2053, length 0
>>> >>
>>> >> I can't "receive" anything.
>>> >>
>>> >> I have generated the certificates and configured in the tls.cfg of
>>> the Kamailio:
>>> >>
>>> >> [server:default]
>>> >> method = TLSv1.2
>>> >> verify_certificate = no
>>> >> require_certificate = no
>>> >> private_key = /etc/letsencrypt/ssl/cert.key
>>> >> certificate = /etc/letsencrypt/ssl/cert.crt
>>> >> ca_list = /etc/letsencrypt/ssl/ca.crt
>>> >>
>>> >> Within Kamailio itself I have it configured to return a 200 KeepAlive
>>> to Teams when it receives an OPTIONS:
>>> >>
>>> >> event_route[tm:local-request] {
>>> >>
>>> >>         if(is_method("OPTIONS") && $ru =~ "pstnhub.microsoft.com") {
>>> >>                append_hf("Contact: <sip: SBC_DNS
>>> :5061;transport=tls>\r\n");
>>> >>         }
>>> >>         xlog("L_INFO", "Sent out tm request: $mb\n");
>>> >> }
>>> >>
>>> >> And I have measured the record_route for this new one:
>>> >>
>>> >> record_route_preset(" SBC_DNS :5061;transport=tls", " SBC_IP :5061");
>>> >>
>>> >> I have created a dispatcher.list:
>>> >>
>>> >> # setid(integer) destination(sip uri) flags (integer, optional),
>>> priority(int,opt), attrs (str,optional)
>>> >> 1:1:sip:sip.pstnhub.microsoft.com;transport=tls 0 3 socket=tls:
>>> SBC_IP :5061;ping_from= sip:SBC_DNS
>>> >> 2:1:sip:sip2.pstnhub.microsoft.com;transport=tls 0 2 socket=tls:
>>> SBC_IP :5061;ping_from=sip: SBC_DNS
>>> >> 3:1:sip:sip3.pstnhub.microsoft.com;transport=tls 0 1 socket=tls:
>>> SBC_IP :5061;ping_from=sip: SBC_DNS
>>> >> 4:1:sip:sip-all.pstnhub.microsoft.com;transport=tls 0 1 socket=tls:
>>> SBC_IP :5061;ping_from=sip: SBC_DNS
>>> >>
>>> >> I think that one of the problems is that I do not send the OPTIONS to
>>> the Teams well, since it is on their panel, it indicates that the SBC is
>>> INACTIVE.
>>> >>
>>> >> I don't know if you could help me straighten this out a bit ...
>>> >>
>>> >> Thank you so much for everything..
>>> >>
>>> >> a greeting
>>> >> _______________________________________________
>>> >> Kamailio (SER) - Users Mailing List
>>> >> sr-users at lists.kamailio.org
>>> >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>> >
>>> > _______________________________________________
>>> > Kamailio (SER) - Users Mailing List
>>> > sr-users at lists.kamailio.org
>>> > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>>
>>>
>>> --
>>> VoIP Embedded, Inc.
>>> http://www.voipembedded.com
>>>
>>> _______________________________________________
>>> Kamailio (SER) - Users Mailing List
>>> sr-users at lists.kamailio.org
>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
> _______________________________________________
> 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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