> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firetone.com.au/llms.txt
> Use this file to discover all available pages before exploring further.

# What it does not do yet

> The honest list: what is missing, what is built but unproven, and what the platform will not allow.

export const Unverified = ({what, detail}) => <Warning>
    <strong>Not yet verified on a live call.</strong> {what} is built and covered
    by tests, but {detail} FireTone's engineering tracker records this as an open
    check rather than a passing one. Treat what follows as the design, and expect
    rough edges the first time you run it.
  </Warning>;

Every one of these is a real gap rather than a setting you have not found. They
are listed so you can plan around them.

## An iPhone that is not open does not ring

This is the big one.

iOS does not let an app hold a SIP connection while it is in the background. The
sanctioned answer is a push that wakes the app a moment before the call arrives,
and the phone half of that is built: the app obtains a VoIP push token and
carries it in its SIP registration, so the server learns where to wake it from
a registration it has already authenticated.

<Unverified what="Push wake-up" detail="nothing on the server sends the push yet, so no iPhone has been woken by one." />

Until that is deployed, an iPhone rings only while FireTone is in the
foreground. **Android is unaffected** — it holds the line open with the
background connection described in [Installing it](/mobile/installing), which is
on by default.

See [Mobile push](/operator/mobile-push) for the server side.

## Video calls

Not in this build. The plumbing carries video and the account screen has a
switch for it, but there is no in-call video UI and the path has never been run
against a PBX — so every entry point is hidden and no camera permission is
asked for. A number dialled as a video call is the one case that has no carrier
fallback.

## Transfer, and merging two calls

Neither is in the app. You can hold a call, place a second, and swap between
them, but you cannot join them or hand one to another extension. Both exist in
[the browser phone](/agent/the-phone).

## Voicemail is a dial-through, not an inbox

There is no list of messages, no playback, no transcription. The Voicemail tab
calls your mailbox and you listen to it as you would from any phone.

## Register on Wi-Fi only

The switch is on the account screen and the setting is saved, but nothing reads
it yet — the app registers on whatever connection it has. Treat the switch as
not yet doing anything.

## Self-signed certificates

A PBX serving a self-signed certificate over TLS cannot be trusted from the app;
there is no switch for it. Use TCP against such a server, or install a
certificate the phone will accept.

## UDP

Selectable, and it will register. It cannot carry a FireTone call — the INVITE
fragments and the call fails every time. The app warns you in red when you pick
it. Use TCP or TLS.

## On the iPhone only

* **No system call log.** iOS opens it to nobody, so Recents holds FireTone's
  own history. Calls placed from the Phone app are not in it.
* **No default-dialer role.** iOS 18.2 added a Calling default in Settings, and
  the app will take you there. Below that version there is nothing to set.
* **No carrier voicemail number.** Hence the voicemail extension setting.