And there's no any errors in RTPEngine log.

Jun 21 13:16:21 debian-opensips rtpengine[7291]: INFO: [860143bf5c80080e]: 
Received command 'offer' from 10.145.213.88:55706
Jun 21 13:16:21 debian-opensips rtpengine[7291]: NOTICE: [860143bf5c80080e]: 
Creating new call
Jun 21 13:16:21 debian-opensips rtpengine[7291]: INFO: [860143bf5c80080e]: 
Enabling transcoding engine
Jun 21 13:16:21 debian-opensips rtpengine[7291]: INFO: [860143bf5c80080e]: 
Replying to 'offer' from 10.145.213.88:55706 (elapsed time 0.008806 sec)
Jun 21 13:16:21 [8057] new branch at sip:[email protected];line=3870aa6a38323e2
Jun 21 13:16:21 [8056] incoming reply
Jun 21 13:16:21 [8055] incoming reply
Jun 21 13:16:24 debian-opensips rtpengine[7291]: INFO: [861278282]: Received 
command 'offer' from 10.145.213.88:55706
Jun 21 13:16:24 debian-opensips rtpengine[7291]: NOTICE: [861278282]: Creating 
new call
Jun 21 13:16:24 debian-opensips rtpengine[7291]: INFO: [861278282]: Enabling 
transcoding engine
Jun 21 13:16:24 debian-opensips rtpengine[7291]: INFO: [861278282]: Replying to 
'offer' from 10.145.213.88:55706 (elapsed time 0.017746 sec)
Jun 21 13:16:24 [8057] new branch at sip:[email protected]:5060;transport=udp
Jun 21 13:16:24 [8055] incoming reply




I also found this 
https://github.com/OpenSIPS/opensips/issues/1288#issuecomment-367293070

And tried as Razvan adviced:

# i know that B side talks PCMU only, so i configre it
rtpengine_offer("RTP/AVP replace-origin replace-session-connection ICE=remove 
transcode-PCMU");


In this case - a little bit better - the call is not dropped, and I see how 
OpenSIPS/RTPEngine
changes the codecs, and even see RTP, but going to one side only, but in 
different codecs.
http://rgho.st/6nkHxTW5p

But still no sound in any direction  :D

-----------------------------------------------
BR, Alexey
http://alexeyka.zantsev.com/
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