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

# Numbers

> Understand caller numbers and how assistants use them.

**Numbers** are the phone lines Ringg AI uses to make and receive calls. A number can come from Ringg AI or from your own telephony provider.

***

## What Numbers Are Used For

| Use Case                 | How the Number Is Used                                  |
| ------------------------ | ------------------------------------------------------- |
| Outbound campaign        | Shows as the caller ID when Ringg AI dials contacts     |
| Individual outbound call | Identifies the caller number for one API-triggered call |
| Inbound assistant        | Receives calls from customers                           |
| Webcall                  | May be used behind the scenes depending on setup        |

***

## Numbers Page

The **Numbers** page lists the phone numbers in your workspace.

| Field        | Meaning                                          |
| ------------ | ------------------------------------------------ |
| **Number**   | Full phone number                                |
| **Country**  | Number country                                   |
| **Added On** | When the number was added                        |
| **Used By**  | Assistant or campaign currently using the number |
| **Tags**     | Labels such as `Default Number`                  |

***

## Telephony Provider

The **Telephony** dropdown shows which provider routes your numbers.

Use **Integrations** and then **Your Telephony** if you need to connect a provider such as Twilio, Exotel, or Plivo.

***

## Default Number

A number tagged as **Default Number** is used when no specific number is selected.

<Note>
  Confirm the default number before launching campaigns. The wrong default caller ID can affect answer rates and customer trust.
</Note>

***

## Number Assignment

You select numbers while creating campaigns. Campaigns can use multiple numbers to distribute call volume.

Inbound assistants need a number that customers can dial.

***

## Removing Numbers

Remove a number only after confirming it is not used by a live campaign, scheduled campaign, or inbound assistant.

<Warning>
  Removing a number that is actively used can interrupt calls.
</Warning>

***

## Developer Handoff

Developers may need number details for API calls, routing, and troubleshooting.

| Item                           | Why It Matters                                        |
| ------------------------------ | ----------------------------------------------------- |
| Phone number                   | Human-readable caller ID                              |
| `from_number_id`               | Preferred API identifier when available               |
| `from_number`                  | Literal phone number used by some API flows           |
| Provider                       | Confirms whether the number is Ringg AI-owned or BYOT |
| Assigned assistant or campaign | Confirms where the number is used                     |

For individual outbound API calls, send exactly one caller-number option: `from_number_id` or `from_number`. Do not send both.