What is MIME type "audio/qcelp"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

audio/qcelp is a MIME type for files that use the QCELP codec. This codec stands for Qualcomm Code Excited Linear Prediction and is designed to compress voice data efficiently.

It is primarily used for telephony applications. The format achieves low bit rates, making it ideal for mobile voice recordings and voicemail systems. It ensures that voice messages are compact and quick to transmit over limited-bandwidth networks.

Optimized Voice Data: Compresses speech while maintaining intelligibility.
Low Bandwidth Efficiency: Ideal for mobile communications where network speeds are limited.
Specialized File Format: Mainly associated with the QCP file format.

Applications must support the QCELP algorithm to play these files properly. For more details on media types, visit the IANA Media Types resource.

Associated file extensions

.qcp

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: audio/qcelp

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="audio/qcelp">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'audio/qcelp');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.qcp

FAQs

Can I play audio/qcelp files directly in a web browser?

No, standard web browsers like Chrome, Firefox, and Safari do not support the audio/qcelp MIME type natively via the HTML5 <audio> element. To play these files on a website, developers should convert the audio to a widely supported format like audio/mpeg (MP3) or audio/wav before serving it to users.

How do I open a file sent with the audio/qcelp content type?

Files with this MIME type are typically Qualcomm PureVoice recordings. While standard media players may fail to open them, you can often play them using VLC media player or the legacy Qualcomm PureVoice Player. If you receive this file as an email attachment, it is likely a voicemail message.

How do I configure my web server to serve .qcp files correctly?

You must map the file extension to the correct MIME type in your server configuration. For Apache, add AddType audio/qcelp .qcp to your .htaccess or config file. For Nginx, add audio/qcelp qcp; inside your mime.types file or types block.

How can I convert audio/qcelp to MP3?

Because audio/qcelp is a specialized speech codec, you usually need specific conversion tools to change it to MP3. Command-line tools like FFmpeg can often handle the conversion, or you can use online audio converters that support the qcp file format.

Why is audio/qcelp used for voicemail attachments?

The QCELP codec is highly optimized for human speech and produces very small file sizes, which was essential for older cellular networks. Many legacy telephony systems and mobile carriers still generate voicemail files in this format to ensure fast transmission over low-bandwidth connections.

What is the relationship between audio/qcelp and the .qcp extension?

The MIME type audio/qcelp is the standard internet media identifier for files ending in the .qcp extension. When a web server sends a .qcp file, it includes this MIME header to tell the receiving client that the data is encoded using the Qualcomm Code Excited Linear Prediction algorithm.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.