What ports 8801-8810 are for, and can we skip them?

Video SDK Web - any last version

Description
Hi there! We recently developed a Video SDK videoconference solution, and we are now “battling” with our customers to make them authorize all the ports required by zoom to work. We did manage to prove those are indeed necessary, as by blocking ports 8801-8810 locally we cannot succesfully connect to any video class.

However, we were super surprised to find out that the demo app at Zoom Video SDK UI toolkit DOES indeed work with no problems with these ports blocked.

So my question: what are those ports for? And, can we set some connection attributes to make them optional in our application as well, so that users can connect even with those ports blocked?