Download Zerotier from here
Join our network, with the code that I will send you, leave all the default settings
Go to the settings of the app and disable IPv6
From now on, whenever you have Zerotier enabled, your phone will be able to communicate directly with my computer like we were in the same house. This is a bit magic, but I won't analyze it for you hehe. The point is: We can do anything we can run on our devices without restrictions from anyone. And it is also encrypted so noone else can see.
Next, download Linphone.
This is a softphone, a SIP client. This can be used to make calls or videocalls from one computer to another.
When you set it up, input the following:
sena
the IPv4 address of your phone on Zerotier (I will give it to you but it's also visible in Zerotier)
doesn't matter, you are not actually logging into anywhere
Now that you are done with this step, go to the settings of Linphone and, from network, disable IPv6 and random port. Also make sure the port is 5060 on the same menu
From that point, we will test a bit to get it working the first time, but it is easy afterwards, just like using a phone
I will help you with any issues you might have and also I will show you how to put me in your Linphone contacts, etc etc