Router settings could be blocking SIP protocols used by the app. You should methodically check each potential cause until the call connects successfully.
Troubleshooting WhatsApp Call Connection Issues
Note that this will log you out and clear local chats, so ensure you have your phone number ready for re-verification. Application and Device State Software glitches are another common cause.
If your signal is weak, or if the network has strict firewall rules that block VoIP ports, the call setup process will fail immediately. Step-by-Step Verification Begin by toggling your connection off and on.
Troubleshooting WhatsApp Call Connection Issues
Clearing the cache and data for WhatsApp (found in your device’s Settings under Apps) will reset the application to its default state. Common Causes of Call Failure The root of this issue usually lies within the network environment or the application's current state.
More About Whatsapp couldn't place call
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