> ## 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.

# Limits & Operational Guarantees

> Capacity, latency, readiness, and data behavior.

<h2 id="guarantees">
  At a glance
</h2>

<CardGroup cols={3}>
  <Card title="1">
    active call per line
  </Card>

  <Card title="5–10s">
    typical persona initialization
  </Card>

  <Card title="Fail closed">
    when readiness expires
  </Card>
</CardGroup>

<h2 id="operational-limits">
  Operational limits
</h2>

* **Concurrency:** one active call per line. A second caller receives busy. Multi-line scaling is the top capacity roadmap item.
* **Answer latency:** pickup within seconds; persona speaking roughly 5–10 seconds later. Video shows a holding screen.
* **Readiness:** workers continuously verify the media path. Evidence expires and must be renewed; until then the line declines calls.
* **Idempotency:** POST requests accept `Idempotency-Key`.
* **Rate limits:** generous project defaults; a limit returns 429 with `Retry-After`.
* **Data:** call records contain aggregates and lifecycle events. Transcripts are consent-gated and authenticated. Media is not recorded.