@nls,
The VOIP setting is only for the doorbell to initiate a phone call to your phone so you can talk to the person who pressed the button on a 2 way Voice Over Internet Protocol phone call.
I don’t have my Alexa running constant in the background on my phone, so it is not one of my Alexa default devices, but I do have Echo Dots in the house that I do have set up to vocalize Person Detection at my entry door cams. So, it is entirely possible that you have your settings for each cam in Alexa set to announce detections and your phone is one of the devices it pushes it to, although for mine, it will only announce for Person Detection. In Alexa, it is in the settings for that specific cam device:
The app I use is Free Notification Reader listed as “FNR Notifications Reader” or com.pelix.notify
Update: FNR has been updated recently and has moved to an Ad based revenue model. Accessing the Advanced Settings requires watching an Ad, but once they are set the App will run in the background without the need for more Ads. You will only need to watch an Ad if you need to return to the Advanced Settings to make a change.
Here is where I posted about it’s capabilities: