@rfuchs hoping you can take a look at this. The merge to master and backport to 5.1.2 has broken my use of rtpengine_manage("DTLS=off") since the DTLS key is removed from the ng-protocol messaged and not processed by rtpengine.
It is needed specifically for FreeSWITCH in SDES (who for some reason does not like a=setup:actpass and a=fingerprint)