[Freeswitch-users] NAT / UDP hole punching issue

Wed Feb 28 08:01:23 UTC 2018

does anyone have a clue ? :=)

On 27 February 2018 at 11:50, Tihomir Culjaga <tculjaga at gmail.com> wrote:

> hi,
>
>
> I have "no audio" issue with TLS and i hope someone could help as Im
> getting crazy ... literally :(
>
> my setup is like this:
>
> Phone <> NAT <> INTERNET <> NAT <FreeSWITCH>
>
> FreeSWITCH version: 1.6.12~64bit ( 64bit)
>
> I have a separate profile configured for TLS:
>
>     <param name="rtp-ip" value="192.168.100.60"/>
>     <param name="sip-ip" value="192.168.100.60"/>
>     <param name="apply-nat-acl" value="rfc1918"/>
>
>     <param name="ext-sip-ip" value="stun:stun.freeswitch.org"/>
>     <param name="ext-rtp-ip" value="stun:stun.freeswitch.org"/>
>
>     <!--<param name="aggressive-nat-detection" value="true"/>-->
>
>    <param name="tls-only" value="true"/>
>    <param name="tls-sip-port" value="15061"/>
>
>
>
> ============================================================
> =====================================
> Name                    tls-public
> Domain Name             N/A
> Auto-NAT                false
> DBName                  sofia_reg_tls-public
> Pres Hosts              192.168.100.60,192.168.100.60
> Dialplan                XML
> Context                 public
> Challenge Realm         auto_from
> RTP-IP                  192.168.100.60
> Ext-RTP-IP              stun:stun.freeswitch.org
> SIP-IP                  192.168.100.60
> Ext-SIP-IP              85.114.41.180
> TLS-URL                 sip:mod_sofia at 85.114.41.180:15061
> TLS-BIND-URL            sips:mod_sofia at 85.114.41.180:
> 15061;maddr=192.168.100.60;transport=tls
> WS-BIND-URL             sip:mod_sofia at 192.168.100.60:5066;transport=ws
> WSS-BIND-URL            sips:mod_sofia at 192.168.100.60:7443;transport=wss
> HOLD-MUSIC              local_stream://moh
> OUTBOUND-PROXY          N/A
> CODECS IN               PCMA
> CODECS OUT              PCMA
> TEL-EVENT               101
> DTMF-MODE               rfc2833
> CNG                     13
> SESSION-TO              0
> MAX-DIALOG              0
> NOMEDIA                 false
> LATE-NEG                true
> PROXY-MEDIA             false
> ZRTP-PASSTHRU           false
> AGGRESSIVENAT           false
> CALLS-IN                0
> FAILED-CALLS-IN         0
> CALLS-OUT               2
> FAILED-CALLS-OUT        2
> REGISTRATIONS           0
>
>
>
> i manage to register the phone with no problems but when i call the phone
> i get no audio;
>
> bgapi expand originate ${sofia_contact(tls-profile/agent2/
> nexios at 192.168.100.60)} &echo()
>
>
>
> FS sends the invite as:
>
>
> SDP in INVITE message from FS
>
>    v=0
>    o=FreeSWITCH 1519708899 1519708900 IN IP4 *85.114.41.180*
>    s=FreeSWITCH
>    c=IN IP4 *85.114.41.180*
>    t=0 0
>    m=audio *17480* RTP/AVP 8 101
>    a=rtpmap:8 PCMA/8000
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>    a=ptime:20
>
>
> SIP Client responds with:
>
>    SDP in 200 OK from the client
>
>
>    v=0
>    o=- 3728718779 3728718780 IN IP4 *213.147.96.240*
>    s=pjmedia
>    b=AS:84
>    t=0 0
>    a=X-nat:0
>    m=audio *4002 *RTP/AVP 8 101
>    c=IN IP4 213.147.96.240
>    b=TIAS:64000
>    a=rtcp:4003 IN IP4 *213.147.96.240*
>    a=sendrecv
>    a=rtpmap:8 PCMA/8000
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>
>
>
> So the UDP stream is: client( *4002 * ) <> ( *17480* )FS
>
> when i sniff the traffic (on both sides client/FS) using wireshark, i see
> RTP packets ( src:4002, dst:17480 ) leaving the client towards FS, but I
> don't see RTP packets ( src:17480, dst:4002 ) from FS side leaving
> towards the client.
>
>
> so my question, of course, is why FS is not sending RTP packets to the
> IP:PORT notified in 200 OK SDP from the client ? Did i miss some needed
> configuration ?
>
>
> in FS logs i see  *192.168.100.60 port 17480 -> 213.147.96.240 port 4002*
> but nothing is actually being sent out from FS
>
> 2018-02-27 11:13:02.733376 [DEBUG] sofia.c:6965 Channel
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 entering state
> [ready][200]
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:4311 Audio Codec
> Compare [PCMA:8:8000:20:64000:1]/[PCMA:8:8000:20:64000:1]
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:4366 Audio Codec
> Compare [PCMA:8:8000:20:64000:1] ++++ is saved as a match
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:4227 Set
> telephone-event payload to 101 at 8000
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:3021 Set Codec
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 PCMA/8000 20 ms
> 160 samples 64000 bits 1 channels
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_codec.c:111
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 Original read
> codec set to PCMA:8
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:4572 Set
> telephone-event payload to 101 at 8000
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:4631
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 Set 2833 dtmf
> send payload to 101 recv payload to 101
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:6588 AUDIO RTP
> [sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551] *192.168.100.60
> port 17480 -> 213.147.96.240 port 4002 *codec: 8 ms: 20
> 2018-02-27 11:13:02.733376 [DEBUG] switch_rtp.c:3875 Starting timer [soft]
> 160 bytes per 20ms
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:6806 Activating
> RTCP PORT 4003
> 2018-02-27 11:13:02.733376 [DEBUG] switch_rtp.c:4261 RTCP send rate is:
> 5000 and packet rate is: 20000 Remote Port: 4003
> 2018-02-27 11:13:02.733376 [DEBUG] switch_rtp.c:2534 Setting RTCP remote
> addr to 213.147.96.240:4003 2
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:6887
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 Set 2833 dtmf
> send payload to 101
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:6894
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 Set 2833 dtmf
> receive payload to 101
> 2018-02-27 11:13:02.733376 [DEBUG] switch_core_media.c:6917
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 Set rtp dtmf
> delay to 40
> 2018-02-27 11:13:02.733376 [NOTICE] sofia.c:8023 Channel
> [sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551] has been
> answered
> 2018-02-27 11:13:02.733376 [DEBUG] switch_channel.c:3770
> (sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551) Callstate
> Change RINGING -> ACTIVE
> 2018-02-27 11:13:02.753388 [DEBUG] switch_ivr_originate.c:3686 Originate
> Resulted in Success: [sofia/tls-public/sip:agent2/n
> exios at 213.147.96.240:10551]
> 2018-02-27 11:13:02.753388 [INFO] switch_channel.c:3127
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 Flipping CID from
> "" <0000000000> to "Outbound Call" <nexios>
> 2018-02-27 11:13:02.753388 [DEBUG] mod_commands.c:4788
> (sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551) State Change
> CS_CONSUME_MEDIA -> CS_EXECUTE
> 2018-02-27 11:13:02.753388 [DEBUG] switch_core_state_machine.c:584
> (sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551) Running State
> Change CS_EXECUTE
> 2018-02-27 11:13:02.753388 [DEBUG] switch_core_state_machine.c:650
> (sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551) State EXECUTE
> 2018-02-27 11:13:02.753388 [DEBUG] mod_sofia.c:198
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 SOFIA EXECUTE
> 2018-02-27 11:13:02.753388 [DEBUG] switch_core_state_machine.c:328
> sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 Standard EXECUTE
> EXECUTE sofia/tls-public/sip:agent2/nexios at 213.147.96.240:10551 echo()
>
>
>
> Regards,
> Tihomir.
>
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