@Kevin_Z Yesterday i tried this dns solution and rebooted my router and tested for a day, my issue is not solved.

Issue: When calling on any VOIP Service (Whatsapp, FB Messenger, Snapchat, Telegram etc), the phone does not have any access to Internet in the background while connected to WiFi Explanation: Like...

@Kevin_Z I am facing exactly same issue on my Tplink archer c20 AC750 router. Please provide the solution which worked for this person.