Is there IOS support for phone/video calling with PWAs?

Through my agency’s testing with other vendors, we have discovered that using a JavaScript SDK for a Progressive Web App doesn’t work on IOS. When using an iframe that requires camera or microphone permission from the device, if the application loses focus (if the user clicks out of the app in any capacity), the permissions are lost and must be regranted. This becomes an issue on IOS because the default inputs for camera/microphone do not get set after regranting permissions. We are hoping your solution gets around this.