Video and IAX Trunk

Good Morning

Ive 3 Freepbx remotely connect by VPN and IAX trunk.

Ive problem with Remote Video Intercom to transfer Video through the IAX Trunk.

The call arrive, Freepbx select the g729 codec as planned but voice do not arrive just a “grrrr”… from received side, while sender side listen to the answer…
Once Ive disabled Video in freepbx everything work like a charm…

Is there any way to set up freepbx to use video at least in local and cut over iax trunk ?? or is there any possibility to add to the trunk the ability of video codecs??

Thanks in advance for your Help !

Regards Claudio