If WhatsApp is blocked, does the call go through - briefly?
If WhatsApp is blocked, voice and video calls will not go through as they rely on an active internet connection to function properly.
If WhatsApp is blocked, does the call go through - in detail?
When WhatsApp is blocked, whether a call goes through depends on several factors, including the nature of the block and the specific network conditions.
Firstly, if the block is implemented at the Internet Service Provider (ISP) level, all traffic to WhatsApp servers will be restricted. In such cases, neither voice calls nor text messages can pass through the ISP's network. This type of block is often used by governments or institutions to prevent access to the service entirely.
However, if the block is more selective and only targets specific features, such as voice calling, other parts of WhatsApp might still function. For example, if the block only affects the voice over IP (VoIP) protocol that WhatsApp uses for calls, text messages and media files may still be exchanged normally. This kind of block is less common but can occur in certain regulatory environments where VoIP services are restricted while other internet communications remain open.
Another consideration is the use of Virtual Private Networks (VPNs) or proxies. If a user employs such tools, they might be able to bypass the block and establish a call even if WhatsApp is officially restricted in their region. VPNs reroute internet traffic through servers in different locations, making it appear as though the user is accessing WhatsApp from an unblocked country.
Moreover, WhatsApp itself employs various techniques to ensure its service remains accessible despite blocks. The platform can switch between different protocols and ports to evade detection by blocking mechanisms. For instance, if a particular port used for voice calls is blocked, WhatsApp might attempt to use an alternative port or protocol to establish the connection.
In summary, whether a WhatsApp call goes through when the service is blocked depends on the specific nature of the block and the measures taken by both the user and WhatsApp itself. While comprehensive ISP-level blocks will typically prevent calls from going through, selective blocks or the use of VPNs can sometimes allow for successful communication.