Corporate Firewalls blocking WebRTC?

Two years ago I started using ZMeeting and ZShowtime because I thought that using a _web based_ video conf service is the smartest way to connect to my customers who use all different kinds of devices and operating systems.

For two years now I have been triying to put ZMeeting and ZShowtime to use for interactions with my external corporate customers. While ZMeeting and ZShowtime usually work fine when I provide webinars to private customers, it often happens that corporate customers cannot use their camera. Usually they see me but they cannot activate their camera. Yesterday it even happened that a customer could not see MY video feed.

After some searching on the web I came to the conclusion that a too restrictive firewall setting at my customers network might block the webRTC traffic, which Zoho's browser based video stream software uses.

On the other hand, Zoom and MS Teams are working fine with them, usually. How is that? Do those companies restrict webRTC in general and then whitelist Zoom and MS Teams specifically? What can I do from my end to make ZMeeting seemlessly work for my corporate customers, too? Trying to convince them or their IT department to firewall-whitelist all browsers to make webRTC work is not going to work, for sure.

This problem has become so bad that I consider abandoning ZMeeting and ZShowtime. It just gives me to much pain in my everyday work when I try to connect to customers. I cannot stand any other ZMeeting call where I have to tell my customer "okay, I see that the video feed is not working. Let's switch to YOUR meeting software."

@Users: What are your experiences with connecting to corporate users?

@Zoho: What can I do from my end to solve this problem?

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