IPv6 Media Relay to backend server uses wrong address family
When you configure flexisip as a frontend proxy server for a ipv6 only backend server using domain names only, flexisip does the following (versus the backend server):
where remote is in fact the address of the backend server.
As far as I was able to track it down (I do not have a buildsystem up and running) I think it is because if a INVITE is sent from the voip client via flexisip to the backend in the form email@example.com,
Agent::getPreferredIp() gets the domain name and not the actual ip address of the backend. In that case
getPreferredIp() will always select IPv4