Media

GSM to MP3 Converter

Convert GSM audio files to MP3 format

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

# 1) Upload each file first → returns { filePath }
curl -X POST 'https://api.elysiatools.com/upload/gsm-to-mp3' \
  -F 'file=@/path/to/audioFile.ext'

# 2) Call the tool with the returned filePath values
curl -X POST 'https://api.elysiatools.com/en/api/tools/gsm-to-mp3' \
  -F 'audioFile=/path/to/file.ext' \
  -F 'bitrate=128' \
  -F 'sampleRate=auto' \
  -F 'channels=1' \
  -F 'keepMetadata=true'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/gsm-to-mp3

Parameters

Name	Type	Required	Description
audioFile	fileupload required	Yes	Upload a GSM file to convert to MP3
bitrate	select	No	GSM is 13 kbps. 128 kbps recommended for voice audio.
sampleRate	select	No	—
channels	select	No	—
keepMetadata	checkbox	No

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-gsm-to-mp3": {
      "name": "gsm-to-mp3",
      "description": "Convert GSM audio files to MP3 format",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=gsm-to-mp3",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "gsm-to-mp3",
    "arguments": {
  "audioFile": "https://example.com/file.ext",
  "bitrate": "128",
  "sampleRate": "auto",
  "channels": "1",
  "keepMetadata": true
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

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