# Real-time recording
> Enable real-time recording in your Vivox project.
## Overview
Real-time recording is a feature designed to stream data in real time from the Vivox backend to external services. By leveraging Vivox real-time recording, developers can capture voice data for purposes such as analytics, moderation, or storage.
## Get started
To get started with Vivox real-ime recording reach out to your technical account manager or create a [ticket](https://support.unity.com/hc/en-us/requests/new?ticket_form_id=360003199531) to request the feature for your project.
## Websocket specification
In order to accept real-time recording data, your service must implement a websocket server that can handle incoming connections from the Vivox real-time recording service.
### Set up the websocket connection
When establishing a websocket connection, your server must validate the authentication token sent in the `Authorization` header. Once you have a token and WSS endpoint you must provide it to your technical account manager to configure the Vivox real-time recording service to connect to your websocket server.
## Data flow
All audio is delivered in 15 second chunks. You will receive two types of messages via a websocket connection:
1. Metadata messages: These messages contain information about the file, such as User URI, channel URI, timestamp, and other relevant metadata.
2. Audio data messages: These messages contain the actual audio data in `OGG` format with 15 seconds of audio data.
Immediately following each metadata message, you will receive a binary audio data message containing the corresponding audio data.
The following diagrams shows the sequence of events and information flow between the real-time recording service and your service:
**Frame:**
```mermaid
sequenceDiagram
participant WSServer as Real Time Recording
participant External as Your Service
Note over WSServer,External: Cycle 1: Sent at T+0s
(Contains 15 seconds of audio data)
WSServer->>External: 1. Send Metadata Message (JSON)
Note over External: User ID, Channel ID, Timestamp, etc.
WSServer->>External: 2. Send Audio Data (OGG Binary)
Note over External: 15-second audio chunk
Note over WSServer,External: 15 seconds elapse (T+0s to T+15s)
Note over WSServer,External: Cycle 2: Sent at T+15s
(Contains next 15 seconds of audio data)
WSServer->>External: 1. Send Metadata Message (JSON)
Note over External: User ID, Channel ID, Timestamp, etc.
WSServer->>External: 2. Send Audio Data (OGG Binary)
Note over External: Next 15-second audio chunk
```
### JSON metadata message format
The metadata message is sent as a JSON object with the following structure:
```json
{
"type": "metadata",
"timestamp": 1705270000, // Unix timestamp indicating the start of the 15-second interval the audio belongs to
"speaker": "sip:.issuer.alice.@domain.vivox.com", // The user the audio belongs to
"listeners": ["sip:.issuer.bob.@domain.vivox.com", "sip:.issuer.charlie.@domain.vivox.com"], // List of users who heard the speaker
"channel": "sip:confctl-g-issuer.general-chat@domain.vivox.com", // Channel the audio was spoken into
"muted": false, // Indicates if the speaker was muted during this interval
"kicked": false // Indicates if the speaker was kicked from the channel during this interval.
}
```
### OGG audio format specification
All audio data is delivered in OGG Opus format with the following specifications:
| Property | Value |
| -------------------- | -------- |
| **Container Format** | Ogg |
| **Audio Codec** | Opus |
| **Channels** | 1 (Mono) |
| **Channel Layout** | Mono |
| **Sample Rate** | 48 kHz |
| **Compression** | Lossy |
## Metadata filtering
Vivox real-time recording supports optional filters that restrict which participants' audio your service receives. When active, each filter is fail-closed: if a participant's metadata isn't received before the recording interval ends, that participant's audio is dropped.
Contact your technical account manager to enable or change any of these filters.
The following table describes the available metadata filters:
| Filter | Description |
| --------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `Allowed Channels` | Limits recording to channels whose URI matches at least one of the configured regular expression patterns. Patterns use [RE2 syntax](https://github.com/google/re2/wiki/syntax). |
| `Allowed User Agents` | Limits recording to participants whose Vivox SDK client platform matches one of the configured platform names. Supported values: `Windows`, `OSX`, `Linux`, `iOS`, `Android`, `Xbox360`, `XboxOne`, `XboxOneGDK`, `XboxSeriesXDK`, `XboxSeriesGDK`, `Playstation4`, `Playstation5`, `NintendoSwitch`, `NintendoSwitch2`, `Web`, `WindowsUAP`. |
| `Allowed Regions` | Limits recording to participants whose IP address resolves to one of the configured [ISO 3166-1 alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2) country codes (for example, `US`, `DE`). |
### Join and leave events
Join and leave events are sent as JSON objects with the following structure:
```json
{
"type":"join",
"timestamp":1677610000, // This timestamp is the time the user joined the channel NOT the minute interval like the audio data
"speaker":"sip:.alice.my-issuer.@domain.com",
"channel": "sip:confctl-g-my-issuer.mychannel1@domain.vivox.com"
}
```
```json
{
"type":"leave",
"timestamp":1677610000, // This timestamp is the time the user joined the channel NOT the minute interval like the audio data
"speaker":"sip:.alice.my-issuer.@domain.com",
"channel": "sip:confctl-g-my-issuer.mychannel1@domain.vivox.com"
}
```