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The app holds each call of the page as a self-managed Telecom call
(transactional API, foreground service), so a headset's AT+CHUP reaches
it. Page and app talk over the Custom Tabs postMessage channel: the page
reports started/ended, the app sends hangup. assetlinks.json grants the
app use_as_origin for that.
/?listen, which the Android app opens, matched no static file and got 404.
The Android app now handles VOICE_COMMAND (HFP AT+BVRA from headsets),
shows over the lock screen and asks to unlock before opening the page.
It opens /?listen, which starts the call without pressing Talk.