You could run tshark on a terminal on the box and filter for dtls traffic to get a better idea.
Contrary to your statement, the dtls-srtp.pem is only relevant to WebRTC.  You can try deleting that file and let FS generate a new one by restarting it.

Also check the date and time on your box to make sure its correct.



On Mon, Nov 10, 2014 at 10:53 AM, mbo <mbodbg@gmx.net> wrote:
Hello,

according to the instructions on https://freeswitch.org/confluence/display/FREESWITCH/WebRTC I have enabled webrtc on one Sip profile. I’ve added my own cerificate and installed in /usr/local/freeswitch/certs. I’m connecting to freeswitch using JsSip library.  The signaling part works fine, I can see all SIP messages in the log, but then it fails to establish the audio/rtp connection:

2014-11-10 17:36:27.065688 [INFO] switch_core_media.c:5206 Skipping RTCP ICE (Same as RTP)
2014-11-10 17:36:27.065688 [INFO] switch_rtp.c:3065 Activate RTP/RTCP audio DTLS client
2014-11-10 17:36:27.065688 [ERR] switch_rtp.c:3117 audio DTLS key err [1]


I’m a bit confused about this message, I thought all tls settings in a sip profile and the dtls-srtp.pem certificate is not relevant for webrtc / wss, or what does this error message want to tell me?

Thanks

Markus 

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