Hi Iñaki,
It's really strange. In my case if I run as root your command I get a socket with "sip" owner. ¿? Did the socket already exist? If so, remove it before start RtpProxy.
This I did several times, but it's always the same.
Further info: - I start rtpproxy at startup via /etc/rc.local. This are the commands in rc.local: /usr/local/bin/my_stun -P /home/sip/my_stun.pid -u sip -D /usr/local/bin/rtpproxy -s unix:/var/run/rtpproxy.sock -u sip chmod go+rw /var/run/rtpproxy.sock /usr/local/sbin/kamctl start
The "chmod" command is my workaround for now.
This is the way I created the user sip: adduser --disabled-password --disabled-login sip
Any idea?
Regards Franz