Hi,
We are using VVX 1500 in our network. But we are having problems for delivering the video for some devices (not all of them)

When the device trying to make a video call just an "X" appears on the screen and nothing more.

As I said we are not facing with this problem on all devices, just a few. But important people are using this.

We had this problem in Version 5.4.5 and 5.5.0.

This is so critical for us, what should we do ?

(All the phones are using the same version at the moment but some of them have the problem)

Thanks.

(Sometimes problem is fixed with restart