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

# Channels

> Voice, chat, WhatsApp, and SMS

A **channel** is how an agent actually reaches someone. Agentic OS supports
four channels today, all handled by **comms-engine**.

<CardGroup cols={2}>
  <Card title="Voice Calls" href="/docs/features/channels/voice" icon="phone">
    Outbound and inbound phone calls via Twilio, Plivo, or Acefone.
  </Card>

  <Card title="Chat" href="/docs/features/channels/chat" icon="comments">
    In-app or web-embedded text conversations.
  </Card>

  <Card title="WhatsApp" href="/docs/features/channels/whatsapp" icon="whatsapp">
    Business messaging over the WhatsApp Business API.
  </Card>

  <Card title="SMS" href="/docs/features/channels/sms" icon="message-sms">
    Text messages sent from a purchased or ported number.
  </Card>
</CardGroup>

## Sessions

Every conversation on any channel is tracked as a **session** — a single call,
chat, or WhatsApp thread instance, viewable from the dashboard.

## Call logs

Regardless of channel, every completed interaction is recorded to call logs —
transcript, recording (voice), duration, cost, and outcome.