@tim.mac119 I've tried a new solution, by default SIP ALG is turned on on many routers, in many places it's mentioned that most implementations are causing more issues than assisting. You can read...

It's just heedless that this issue is affecting so many customers (m4, m5, m9) for months and TPLink are not able to provide a software fix. Especially during Covid where everyone is working from...

@TP-Link I'm having the Deco M5 for a week now, before that I was using my ISP router, I'm experiencing same issues as described here before. Sent an email to support@tp-link.com, copying it here...