Here is the scenario:
- PCa in network X to PCb in network Y: Audio+Video works.
- PCa in network X to MOBILE in network X: Audio+Video works.
- PCa in network X to MOBILE in network Y: Audio works, Video works only from PC to mobile
In 3) the PC only sees a black screen while the video from the PC is displayed fine on mobile.
This happens with MOBILE beeing an IOS device with the IOS talk app and MOBILE beeing an android device with the android talk app.