---
title: "How to Set Up DTMF"
slug: "how-to-set-up-dtmf"
updated: 2024-11-29T22:57:40Z
published: 2024-11-29T22:57:40Z
canonical: "ametawiki.ametagroup.com/how-to-set-up-dtmf"
excludeFromExternalSearch: true
---

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

# How to Set Up DTMF

### Basic Concept

**What is DTMF?**

Dual-Tone Multi-Frequency (DTMF) is a signaling method in telecommunication systems for numerical inputs. **It allows users to unlock doors by pressing a DTMF "Unlock" button or entering a code on the keypad during a call.**

**How is DTMF Transmitted in SIP?**

In the Session Initiation Protocol (SIP), there are three primary methods for transmitting DTMF tones:

| Inband DTMF | Out-of-band DTMF (RFC 2833) | Out-of-band DTMF (SIP INFO) |
| --- | --- | --- |
| - Sent within the audio stream. - **Simple but less reliable** due to potential sound quality issues. | - Sent via RTP packets as per RFC 2833. - **Reliable and widely supported**. | - Sent as SIP INFO messages. - **Reliable but less commonly supported.** |

### Set Up DTMF on the Akuvox Cloud

1. Click ![](https://cdn.document360.io/698fbf35-46b1-42c8-9a01-0506761ce4e8/Images/Documentation/how-to-set-up-dtmf-image-sg3vi8qr.png)for the site you want to configure.

![A screenshot of a computer Description automatically generated](https://cdn.document360.io/698fbf35-46b1-42c8-9a01-0506761ce4e8/Images/Documentation/how-to-set-up-dtmf-image-w2ctuqvm.png)

2. Click the 'Intercom Devices' button, then click ![](https://cdn.document360.io/698fbf35-46b1-42c8-9a01-0506761ce4e8/Images/Documentation/how-to-set-up-dtmf-image-khve4ffh.png) for the doorphone you want to configure.

![A screenshot of a computer Description automatically generated](https://cdn.document360.io/698fbf35-46b1-42c8-9a01-0506761ce4e8/Images/Documentation/how-to-set-up-dtmf-image-9jccr549.png)

3. In the Edit Device window, Relay 1 is enabled by default for each doorphone. You can assign a DTMF code from 0 to 9, or use '#' or '*' for each relay. Additional relays can be added as needed. In my case, the user will use the '9' button to unlock the door during a call.

![A screenshot of a computer Description automatically generated](https://cdn.document360.io/698fbf35-46b1-42c8-9a01-0506761ce4e8/Images/Documentation/how-to-set-up-dtmf-image-2k6nyf5w.png)