Tonmind IP Speakers support DTMF (Dual-Tone Multi-Frequency) control, providing a simple and flexible way to trigger preset actions directly from an external SIP phone or softphone.

With a SIP application such as Linphone, users can make a SIP call to a Tonmind IP Speaker and press a predefined number on the keypad. The corresponding DTMF command can then trigger an audio file stored on the IP Speaker or execute a configured HTTP URL.

This feature makes remote audio control and system integration easier for applications such as schools, factories, shopping malls, hospitals, office buildings, warehouses, and other public-address environments.

How Does DTMF Control Work?

DTMF is the keypad signaling method commonly used when pressing numbers during a phone call.

With Tonmind IP Speakers, different keypad numbers can be configured as trigger commands. For example, the number 2 can be assigned to play a specific audio file, trigger an HTTP URL, or perform both actions depending on the configuration.

The basic process is:

SIP Phone / Linphone → SIP Call → DTMF Key → Tonmind IP Speaker → Trigger File or HTTP URL

This allows users to control preset actions without opening additional management software.

How to Configure DTMF on Tonmind IP Speaker

The configuration is simple and can be completed through the IP Speaker's web interface.

Step 1: Configure the DTMF Number

Log in to the Tonmind IP Speaker web page and go to:

Alarm Input → DTMF

Enter the DTMF number you want to use.

For example: DTMF: 2

This means that when the speaker receives the DTMF digit 2 during an active SIP call, it can execute the corresponding configured action.

Step 2: Enable Audio File Playback

If you want the DTMF command to trigger a stored audio message, enable:

File Enable

Then select or configure the corresponding audio file.

For example, pressing 2 could play a prerecorded message such as an emergency announcement, evacuation instruction, closing notice, or other customized audio.

Step 3: Enable HTTP URL Trigger

Tonmind IP Speakers can also use DTMF commands to trigger an HTTP URL.

Enable:

URL Enable

Then enter the required HTTP URL.

When the configured DTMF number is received, the IP Speaker will send the corresponding HTTP request.

This is especially useful when integrating the speaker with alarm systems, automation platforms, access control systems, security systems, or other network devices.

How to Trigger the Function with Linphone

After completing the configuration on the IP Speaker, an external SIP phone or softphone such as Linphone can be used to activate the function.

The operation is straightforward:

1. Open Linphone or another compatible SIP phone.

2. Make a SIP call to the IP address or SIP address of the Tonmind IP Speaker.

3. Wait until the call is connected.

4. Open the dial keypad.

5. Press the configured DTMF number, for example 2.

6. The IP Speaker receives the DTMF command and executes the configured task.

If File Enable is activated, the corresponding audio file will be played.

If URL Enable is activated, the configured HTTP URL will be triggered.

This provides a convenient way to remotely activate different functions through a standard SIP communication workflow.

Multiple DTMF Commands for Different Tasks

Different DTMF numbers can be assigned to different actions according to project requirements.

For example:

• Press 1: Play a welcome message

• Press 2: Play an emergency announcement

• Press 3: Trigger an HTTP URL

• Press 4: Activate another predefined audio message or automation task

By configuring different keypad commands, users can create a simple remote-control system for daily paging, emergency notification, security integration, and automation.

Application Scenarios

Schools

Staff can use a SIP phone to remotely trigger prerecorded messages for class changes, emergency announcements, evacuation instructions, or other campus notifications.

Factories and Warehouses

Operators can trigger safety warnings, production notifications, shift announcements, or HTTP commands from a control room without manually accessing each IP Speaker.

Shopping Malls

DTMF commands can be used to activate promotional messages, closing announcements, emergency notifications, or other scheduled and temporary broadcasts.

Hospitals

Authorized staff can quickly trigger predefined announcements or integrate the IP Speaker with existing communication and alarm systems.

Office Buildings

DTMF can be used for building-wide notifications, emergency messages, security alerts, and integration with access control or building automation systems.

Benefits of Tonmind IP Speaker DTMF Control

The DTMF function provides several advantages for IP audio and paging systems:

• Simple remote operation through a SIP phone or softphone

• Fast triggering of prerecorded audio files

• HTTP URL support for third-party system integration

• Flexible configuration for different keypad commands

• No additional control hardware required for basic remote triggering

• Suitable for both daily paging and emergency applications

• Easy integration with existing SIP communication systems

Flexible SIP Paging and Automation with Tonmind

By combining SIP communication, DTMF control, prerecorded audio playback, and HTTP URL triggering, Tonmind IP Speakers provide a flexible solution for modern IP paging and notification systems.

Users can simply make a SIP call from Linphone or another SIP phone, press a configured keypad number, and remotely trigger the required action on the IP Speaker.

Whether deployed in schools, factories, shopping malls, hospitals, office buildings, or other commercial and industrial environments, the DTMF function helps make IP paging systems more convenient, responsive, and easier to integrate with existing network infrastructure.