@Al3xis It's not just me then. I purchased one of these just before Xmas and have spent hours this evening trying to set it up.

i can find absolutely no way to prevent the issue you're having (to make matters worse both myself and my wife have iPhones and iPads, so they all start going off when the doorbell is pressed).

Worryingly I Googled the issue and found at least one person reporting isthe sme problem at least 5 months ago, so it doesn't look like it's being addressed. I'm rather wishing I hadn't purchased the doorbell at the moment, as I've recently moved home and the doorbell was purchased in readiness. Currently it's not even fixed to the wall. 
 

I hope we manage to find a solution, as it's so annoying. 

  @TPQA  hello, 

Thank you for your reply, i have seen the post in reddit, probably the same as you've seen.

This problem is not a game changer for me because for exemple: My wife answer the call if i answer also it's writted "Busy Line" one the top of the screen.

I had a Netatmo doorbell that was doing this perfectly if someone answer, it cut the others and send a notification "someone answered the call". but for the rest the Netatmo doorbell is a very very bad product.

TP-LINK i love this brand but they need to improve the calling and notifications system.