You can switch the telephony function in the Home App on or off as you wish to answer calls to landlines from your smartphone.
You can customize the option as follows:
1. Switch to the "Phone" section in the Home app.
2. Select the "Settings" tab. To do so, scroll the top navigation list all the way to the right.
3. Set the "Telephony function" switch to on or off, depending on your needs.
This way you can activate or deactivate the telephony function at any time. Please note that the telephony function currently only works with an active WLAN connection to your router.