@Anon22 Hello, apologies for the super late reply, I hope you have figured this out already. As far as I can understand, you will need to subscribe to some kind of VoIP service from your ISP if you...

@Pala73 Thank you for posting on the TP-Link Community. Firstly, please ensure you are running the latest firmware on the AX1500, you may hit the Check for updates on its web interface to confirm, or...

@zexoni70 There was a historical background for this specific model and firmware, but I cannot explain that for you in details. We will soon release a new firmware soon in weeks, please check it...

@HAMATONER @LeThang Hello, apologies for the super late reply. Make sure you are tagging a TP-Link Admin if you want a timely response. Unless we are tagged we do not see that new responses have been...

@crevent Was there any error message when you were trying to upgrade the firmware? Can you upgrade to the previous versions, such as M7350(EU)_V5_181220? Try to upgrade to this version first and see...

@zexoni70 Hi, this firmware you are trying to update is actually an older version, so there is no need to update it. You can verify the firmware version via the build number.