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The app is au.remotiq.firetone.client on both stores. Ask your administrator which build you should be on; a handset one version behind a PBX change is the commonest cause of a fault that looks like a network problem.

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The first run

The app asks for what it needs on the way in, and explains each one as it asks. Nothing is requested that is not used. You can skip the SIP account at this point and add it later. You cannot skip the microphone and still make calls.
The camera permission string appears in the iPhone’s privacy list even though FireTone does not use the camera. It is there because the media library the app links declares it. Video calling is switched off in this build.

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Making it the default phone app

This is worth doing on Android and it is the single biggest difference in how the app feels. As the default phone app, FireTone answers tel: links, shows the lock-screen call UI, writes to the system call log, and handles carrier calls with the same screen as FireTone calls. Settings › Calling › Default calling app opens the system prompt. The row says which app currently holds the role. On the iPhone there is no equivalent role. iOS 18.2 added a Default Apps list, and the same row will open Settings for you — Settings › Apps › Default Apps › Calling. Below that version there is nothing to set, and FireTone works as an ordinary app: you open it to call, and carrier numbers hand off to the Phone app.

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Keeping the line up

Settings › Calling › Keep FireTone connected (Android only) holds the registration open while the app is closed, so calls ring. It shows a quiet notification because Android requires one, and it is on by default. Switch it off and the app only rings while it is open — until push wake-up is deployed. What that depends on is worth reading before you turn it off.