There were lot of development efforts in the two options available for NAT traversal with OPENSER.
Mediaproxy relesed next generation version: v2.0. More details at:
Rtpproxy brings lately lot of new stuff, information is available at the dedicated site:
Kamailio Advanced Training
March 25-27, 2019, in Washington DC, USA
Click here for more details!
Learn how to build RTC services with Kamailio!