> ## Documentation Index
> Fetch the complete documentation index at: https://docs.get2dial.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Voice connectivity

> Connect a carrier, add phone numbers, and set up outbound routes so Get2Dial can send and receive calls.

Before Get2Dial can send or receive a single call, it needs a telephone network connection.
This group covers that connection: the carrier trunk, the phone numbers that ride on it, and
the routes that decide which carrier sends an outbound call.

## How it fits together

A **carrier** is your SIP trunk to the phone network. Everything else in this group depends
on one existing and being approved: **outbound routes** decide which carrier sends an
outbound call, and **phone numbers** are only trusted for inbound calls once their carrier
is active and approved. See [How Get2Dial works](/get-started/how-get2dial-works) for the
full object model.

```mermaid theme={null}
flowchart LR
    A[Carrier] --> B[Outbound route]
    A --> C[Phone number]
```

A carrier connects to an outbound route (for calls leaving Get2Dial) and to a phone number
(for calls arriving at Get2Dial); both depend on the same carrier being active and approved.

## Common tasks

<CardGroup cols={2}>
  <Card title="Connect a SIP carrier" href="/voice/connect-a-carrier" />

  <Card title="Add an outbound route" href="/voice/outbound-routes" />

  <Card title="Add a phone number" href="/voice/phone-numbers" />

  <Card title="Verify your connectivity" href="/voice/test-your-connectivity" />
</CardGroup>

## Learn more

<Card title="How Get2Dial works" href="/get-started/how-get2dial-works" />