Messenger Call: Unblock

Because "paper" in this context usually refers to academic literature, and there are no specific academic papers solely dedicated to "unblocking a specific app," the most for this subject fall under the categories of Internet Censorship Circumvention and Network Traffic Analysis .

If you aren't receiving calls because you previously muted or restricted a specific person, you can reverse this in your settings: unblock messenger call

: Scroll down and select Privacy & safety . Because "paper" in this context usually refers to

To "unblock" a Messenger call, you must mask the traffic so the firewall cannot identify it as a VoIP call. The most to read for the theory is "The Design and Implementation of a VPN-based Circumvention System," while the most useful practical tool is switching to Mobile Data or using a Premium VPN with Obfuscation . The most to read for the theory is