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

[Miguel Oyarzo]

 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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