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

# FAQ

> Common product and integration questions.

<div id="caller-installation">
  <Accordion title="Does the caller need to install anything?" defaultOpen>
    No. Any iPhone, iPad, or Mac with FaceTime works. That is the point.
  </Accordion>
</div>

<div id="multiple-lines">
  <Accordion title="Can one assistant serve multiple lines?">
    Yes. Each line resolves the assistant's active published version independently.
  </Accordion>
</div>

<div id="switch-assistant">
  <Accordion title="Can I switch a line's assistant mid-day?">
    Yes. Assign another assistant or publish a new version; it takes effect on the next call. Active calls never change mid-call.
  </Accordion>
</div>

<div id="endpoint-down">
  <Accordion title="What if my Model 3 call.incoming endpoint is down?">
    The call is declined at the response deadline. The caller experiences a normal unanswered or busy call.
  </Accordion>
</div>

<div id="audio-only">
  <Accordion title="Are audio-only agents supported?">
    Yes. FaceTime Audio uses the same assistant; the avatar is simply not rendered.
  </Accordion>
</div>

<div id="custom-voice-llm">
  <Accordion title="Can I run my own voice or LLM but use Chert's avatar?">
    Not currently. Model 3 gives you full control by bringing the entire agent; Model 1 uses Chert's managed stack end-to-end.
  </Accordion>
</div>

<div id="design-partner-access">
  <Accordion title="How do I get design-partner access?">
    Contact the Chert team for access to Sessions and webhooks.
  </Accordion>
</div>