Hi, I found this:
https://lists.packetizer.com/pipermail/h323plus/2014-February/002625.html
So it seems there is no support currently. Can someone give me some directions on how to implement this? Thanks in advance

Diego

From: Diego Carvalho Domingos
Sent: Friday, May 26, 2017 3:46 PM
To: h323plus@lists.packetizer.com
Subject: H235 on extended video channel (H239)

Hi, all

I’m successfully using both h239 and h235 (for audio and video channels) in my application. Now I also would like to encrypt the content video (extended video channel). It seems that the security capability is not being added to the H.239(H.264{sw} <1>) capability. Is there some way to enable it? Thanks in advance.

Diego