[Freeswitch-users] WebRTC: Receiving local IP in SDP

Wed Jun 18 17:23:04 MSD 2014

see:

ext-rtp-ip
ext-sip-ip
local-network-acl

Those need to be set properly to determine the correct IP to fib about in the SDP, The ACL dictates whats inside the nat all else is outside.
--
Brian West
brian at freeswitch.org

Twitter: @FreeSWITCH , @briankwest
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On Jun 18, 2014, at 12:54 AM, Miguel Oyarzo <miguelaustro at gmail.com> wrote:

>  Hi,
> 
> I cannot manage to send the right SDP into the INVITE message from FS to my WebRTC client registered on it.
> 
> The scenario is:
> 
> WebClient<---wss/srtp---->FS<--rtp-->SIP_Endpoint
> 
> - FS run in a EC2 instance.
> - FS/application="bridge"
> - WebClient run on Internet.
> 
> Calls from WebClient to SIP_Endpoint works well and FS manages to reply a 200 OK response, after INVITE from WebClient, with a public IP into SDP.
> Audio is bi-directional, all looks good.
> 
> However, calls originated on SIP_Endpoint to WebClient makes FS to include its private IP into the DSP for any INVITE toward WebClient (B-leg).
> 
> I have updated 'tried ext-rtp-ip' to
> - Public IP address of the instance
> - private and public STUN services
> - auto-nat
> 
> No matter what I do, I always get 
> o=FreeSWITCH 1403050916 1403050917 IN IP4 10.10.1.120
> c=IN IP4 10.10.1.120
> 
> At the WebClient side (INVITE). The weird is, using the same profiles in FS, calls from WebClient to SIP_Endpoint have no issues.
> 
> 
> 
> Trace in FS (SIP_Endpoint -> WebClient)
> ----------------------------------------------------------------------------
> 2014-06-18 13:09:50.318354 [NOTICE] switch_channel.c:1053 New Channel sofia/inboundbrowser/61370000000 [02c48e60-f696-11e3-b962-2703af7256ae]
> 2014-06-18 13:09:50.318354 [DEBUG] mod_sofia.c:4446 (sofia/inboundbrowser/61370000000) State Change CS_NEW -> CS_INIT
> 2014-06-18 13:09:50.318354 [DEBUG] switch_core_session.c:1384 Send signal sofia/inboundbrowser/61370000000 [BREAK]
> 2014-06-18 13:09:50.318354 [DEBUG] mod_sofia.c:4516 [zrtp_passthru] Setting a-leg inherit_codec=true
> 2014-06-18 13:09:50.318354 [DEBUG] mod_sofia.c:4519 [zrtp_passthru] Setting b-leg absolute_codec_string='PCMA at 8000h@20i at 64000b'
> 2014-06-18 13:09:50.318354 [DEBUG] switch_core_state_machine.c:467 (sofia/inboundbrowser/61370000000) Running State Change CS_INIT
> 2014-06-18 13:09:50.318354 [DEBUG] switch_core_state_machine.c:507 (sofia/inboundbrowser/61370000000) State INIT
> 2014-06-18 13:09:50.318354 [DEBUG] mod_sofia.c:87 sofia/inboundbrowser/61370000000 SOFIA INIT
> 2014-06-18 13:09:50.318354 [DEBUG] switch_core_media.c:865 Set Local Key [1 AES_CM_128_HMAC_SHA1_80 inline:4hCK5K0NEWULvEWlyp6LEmcPVDwqTu2AUhbh7jqV]
> 2014-06-18 13:09:50.318354 [DEBUG] switch_core_media.c:865 Set Local Key [1 AES_CM_128_HMAC_SHA1_80 inline:6TEOHAvn7aga7PA7GvEsm/QBsztoMyov4Jv8vvGg]
> 2014-06-18 13:09:50.318354 [DEBUG] sofia_glue.c:1196 sip:10.10.1.120:5064;transport=udp;lr;ovid=aa2aa1e2 Setting proxy route to sofia/inboundbrowser/61370000000
> 2014-06-18 13:09:50.318354 [DEBUG] sofia_glue.c:1225 sofia/inboundbrowser/61370000000 sending invite version: 1.5.8b git 68e1a56 2014-02-23 23:59:01Z 64bit
> Local SDP:
> v=0
> o=FreeSWITCH 1403050916 1403050917 IN IP4 10.10.1.120
> s=FreeSWITCH
> c=IN IP4 10.10.1.120
> t=0 0
> a=msid-semantic: WMS pulb3IfP3ufkGKJf4haQDJ15jmDs4syk
> m=audio 10074 RTP/SAVPF 8 101 13
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fingerprint:sha-256 6D:40:E1:C3:73:9F:F1:33:DA:7B:4B:1A:F1:2B:74:C7:42:24:EF:3D:84:6A:3B:1A:F9:9D:8B:3B:09:AB:33:AF
> a=rtcp-mux
> a=rtcp:10074 IN IP4 10.10.1.120
> a=ssrc:3489368462 cname:NKlGirlcLrmh1WnW
> a=ssrc:3489368462 msid:pulb3IfP3ufkGKJf4haQDJ15jmDs4syk a0
> a=ssrc:3489368462 mslabel:pulb3IfP3ufkGKJf4haQDJ15jmDs4syk
> a=ssrc:3489368462 label:pulb3IfP3ufkGKJf4haQDJ15jmDs4syka0
> a=ice-ufrag:4oCxXtt6GWoBfNLT
> a=ice-pwd:nXpveByQTLXLybxs
> a=candidate:1887505845 1 udp 659136 10.10.1.120 10074 typ host generation 0
> a=candidate:1887505845 2 udp 659136 10.10.1.120 10074 typ host generation 0
> a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:4hCK5K0NEWULvEWlyp6LEmcPVDwqTu2AUhbh7jqV
> a=ptime:20
> a=sendrecv
> ----------------------------------------------------------------------------
> 
> 
> What's is wrong here is c=IN IP4 10.10.1.120 (must be public for RTP traffic between WebClient and FS)
> and 
> a=candidate for public IP is missing (STUN is enabled in FS's profile)
> 
> 
> Any idea? 
> 
> 
> -- 
> "Efficiency is doing things right; effectiveness is doing the right things (Peter Drucker)"
> 
> Miguel Oyarzo
> DevOps & VoIP Engineer
> Linux User: # 483188 - counter.li.org
> http://au.linkedin.com/in/mikeaustralia 
> Melbourne, Australia
> _________________________________________________________________________
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> 
> 
> 
> 
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