[Linphone-users] Video not working

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Hello!I use two Windows 7 virtual machines on which I installed the linphone 
application, and each one is connected to a router as a telephone exchange. The 
network is created in an online environment, GNS3, and does not have access to 
the Internet. I made a call between the two machines based on the IP addresses 
of the switchboards to which they are connected. The phone call works, but the 
activation of the video option during the call cannot be activated, although 
the camera works in the video preview. What could be the problem?Thank you!