atm , dont have freepbx running anymore
tried yeastar (also based on asterisk) => no early video
tried 3cx => not based on asterisk => success
tried freeswitch/fusionpbx => not based on asterisk => success
my intercom sends an 183 session with h264, so all looks good, all other sip servers do send early video, tried with linphone as client
only when i i use freepbx, i only see video AFTER i pickup the call, not before, so quite useless for door intercom systems…
tried the stuff too or a combination, no luck either
directmedia=yes
directrtpsetup=yes
prematuremedia=no
progressinband=no