# DTMF prefix

> Ask callers to key in a number, such as an account number, and show it to the user who answers.

- URL: https://kb.voipcloud.online/au/pbx/identifiers/dtmf-prefix/
- Section: PBX › Identifiers
- Type: reference
- Applies to: All countries
- PBX object: dtmf
- Last reviewed: 2026-11-09

**DTMF prefix** plays a greeting asking callers to enter digits, such as their account number, followed by **#**. The digits are added in front of the caller ID, so the user who answers sees them straight away.

The digits are also available as `{dtmf_prefix}` in [API request](https://kb.voipcloud.online/au/pbx/advanced/api-request/) and [Webhook](https://kb.voipcloud.online/au/pbx/advanced/webhook/) objects.

## Add it to your call flow

1. Drag **DTMF prefix** from the **Identifiers** group onto the canvas and click the gear icon.
2. Enter a **Name**.
3. Add a **Greeting** with **Record your voice** (in the browser or over a phone call) or **Upload file**. Tell callers to enter the digits and then press **#**.
4. Click **Save**, connect it before your users, and click **Apply configuration**.

![DTMF prefix settings](https://kb.voipcloud.online/au/images/pbx/identifiers/dtmf-prefix-settings.webp)

## Settings

| Setting | What it does |
| --- | --- |
| Name | Label on the canvas. |
| Greeting | The message asking for the digits. |

## Related

- [Caller ID prefix](https://kb.voipcloud.online/au/pbx/identifiers/caller-id-prefix/)
- [API request](https://kb.voipcloud.online/au/pbx/advanced/api-request/)