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An assistant is one configured voice agent. It holds the prompt, the voice, the models, and the lists of tools, knowledge and playbooks it may use. One assistant can answer a phone number, run on your website, and make outbound calls at the same time.
The assistant editor

The assistant editor.

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Name and avatar

Give the assistant a name you’ll recognise in the calls list — if you run several lines, name them after the line rather than the persona. Pick an avatar to tell them apart at a glance.

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Prompt

The system prompt is the assistant’s instructions. Keep it specific about what it should do and how it should sound. You can use variables anywhere in it, so the prompt knows the time, the caller, and anything your systems told it:
First message is what the assistant says when the call connects. Leave it empty and the assistant waits for the caller to speak first.
New to this? Writing prompts for voice calls covers how to structure one so it works on the phone.

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Voice and models

Browse voices and hear them before choosing. For multilingual calls, Soniox handles language switching mid-conversation; set language hints for the languages you expect. You can also set a fallback model, so a call continues on a second provider if the first one fails.

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What it will cost

As you change models, the editor shows an estimated cost per minute, broken down by the language model, the voice and the transcription. Swap a model and the figure moves before you save anything. Anything running on your own provider key shows as BYOK and isn’t billed by Qall.
The language model is usually the biggest line and the easiest to over-spend on. Try the cheapest one that holds the conversation before reaching for a larger one — on a phone call, latency often matters more than reasoning.

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Voice settings

Pick a voice from the list, or paste a voice id from your provider for a cloned or custom voice. ElevenLabs voices add three more controls: For phone calls, moderate stability and low style usually sound most natural — heavy styling reads as theatrical down a phone line, and costs time on every turn.

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Speech-to-text settings

Keyterms are worth the five minutes. If your callers say a brand name the transcriber keeps mangling, adding it here fixes it more reliably than anything in the prompt.

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Conversation behaviour

These control how the assistant handles the back-and-forth. The defaults work for most phone calls — change them if callers tell you something feels off.

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Turn-taking

The assistant decides when you’ve finished speaking rather than waiting for a fixed silence. It commits after 0.3 seconds at the earliest and 2.5 seconds at the latest. Lower the minimum for a snappier feel; raise the maximum if your callers pause mid-sentence to think. Two detectors are offered. Audio model is the one to use — it listens to how you’re speaking and decides from that. Text model is kept for older setups; it waits for the transcript before deciding, which adds a noticeable pause on providers that only transcribe once you’ve stopped.

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When the caller goes quiet

Set idle timeout to the number of seconds of silence after which the assistant checks in. It asks up to three times, then says goodbye and hangs up. Leave idle message empty and the assistant writes its own check-in, in whatever language it has been speaking. Fill it in only if you need exact words — what you write is what’s said, in the language you wrote it.

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Recording

For the consent gate in full — keypad answers, per-language wording, and what happens when a caller declines — see Recording and consent.
Recording is on by default. Each call produces one audio file of both sides, as MP3 or OGG. Turn on ask for consent and the assistant asks before recording starts. The caller can answer out loud or press 1 to agree and 2 to decline. Either way the call continues — declining only means it isn’t recorded.

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What the assistant can use

Attach tools, knowledge and playbooks from the assistant’s own page. Outcomes work the other way round: an outcome lists the assistants it applies to, so you assign those from the Outcomes page.