webrtcbin not working in remote networks

[givip]

I tried to fix mentioned problems:
- I tried to transform generated SDP by browser to match session id from
offer, so webrtcbin received answer with same ID, but this doesn't work.
Please notice, that I can connect from other browser to demo page and video
stream works well. Check demo page links in the end of message.
- I changed way of how I send ICE candidates, because classical way trough
Signalling server gave me errors on browser side. Now I send it not after
offer, but I injected all of them directly in offer, as 'a=candidate: ...'.
Still no sense.

Here the step-by-step description of how my program works:
Prerequisites: I have two gstreamer pipelines:
    - one with appsrc in head and webrtcbin for video channel in tail. We
will call it "Data webrtcbin" below.
    - other sole webrtcbin for data channel (I tried to encapsulate this in
one webrtcbin, but this doesn't want to work together at all) We will call
it "Video webrtcbin" below.

1. Browser establish data channel connection with "Data webrtcbin". Works in
both direction in any networks perfectly.
2. Browser's user asks to send video stream by sending special command
trough data channel (let's say 'CALLME')
3. "Data webrtcbin" receive message and ask "Video webrtcbin" to create
offer.
4. "Video webrtcbin" gathers ice-candidates.
5. After ice-gathering-status is COMPLETED, all ICE candidates have been
added to offer as attribute.
6. Send Offer to signalling server.
7. Receive Answer from browser (without any candidates).
8. Receive ICE candidates from Signalling server.
9. Adding ICE candidates to "Video webrtcbin".

Works in local networks perfectly! Not work in other networks. 

May be Ice candidates, that I received from browser (trough signalling
server, not in answer), are inaccessible? 
Here is log  webrtcbin_log.txt
<http://gstreamer-devel.966125.n4.nabble.com/file/t378892/webrtcbin_log.txt>   

Also you can play yourself with my signalling server, maybe that will help:
https://gp-apps.com/peer/send.html <https://gp-apps.com/peer/send.html>  
https://gp-apps.com/peer/receive.html
<https://gp-apps.com/peer/receive.html>  
   



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