@Clive_A Whatsapp support is quite difficult to reach for this specific problem, but with a simple internet search for tplink releted to whatsapp problem or nat4 and whatsapp problem you can find a...

@Clive_A The problem appears in both directions no matter where the call was initialized. I have tha same issue in 5 different sites with er707 and er605 router no matter which ap or LAN...

Dear TP-Link Support Team, I am writing to report a critical issue with my TP-Link router, model er 605 and er707. I am unable to consistently use WhatsApp voice/video calls, and I also experience...