# Asynchronous message reception
<a name="async-message-reception-api"></a>

All response messages are asynchronously delivered to the recipient as events (for example, an SDP offer or SDP answer delivery). The following is the event message structure. 

## Event
<a name="async-message-reception-api-request"></a>

```
{
    "senderClientId": "string",
    "messageType": "string",
    "messagePayload": "string",
    "statusResponse": {
        "correlationId": "string",
        "errorType": "string",
        "statusCode": "string",
        "description": "string"
    }
}
```
+ **senderClientId** - A unique identifier for the sender client.
  + Type: String
  + Length constraints: Minimum length of 1. Maximum length of 256.
  + Pattern: `[a-zA-Z0-9_.-]+`
  + Required: No
+ **messageType** - Type of the event.
  + Type: ENUM
  + Valid Types: `SDP_OFFER`, `SDP_ANSWER`, `ICE_CANDIDATE`, `GO_AWAY`, `RECONNECT_ICE_SERVER`, `STATUS_RESPONSE`
  + Length constraints: Minimum length of 1. Maximum length of 256.
  + Pattern: `[a-zA-Z0-9_.-]+`
  + Required: Yes
+ **messagePayload** - The base64-encoded message content.
  + Type: String
  + Length constraints: Minimum length of 1. Maximum length of 10K.
  + Required: No
+ **correlationId** - An unique identifier of the message for which the status is meant. This is the same correlationId provided in the client messages (for example, SDP offer, SDP answer, or ICE candidate).
  + Type: String
  + Length constraints: Minimum length of 1. Maximum length of 256.
  + Pattern: `[a-zA-Z0-9_.-]+`
  + Required: Yes
+ **errorType** - A name to uniquely identify the error.
  + Type: String
  + Length constraints: Minimum length of 1. Maximum length of 256.
  + Pattern: `[a-zA-Z0-9_.-]+`
  + Required: No
+ **statusCode** - HTTP status code corresponding to the nature of the response.
  + Type: String
  + Length constraints: Minimum length of 1. Maximum length of 256.
  + Pattern: `[a-zA-Z0-9_.-]+`
  + Required: No
+ **description** - A string description explaining the status.
  + Type: String
  + Length constraints: Minimum length of 1. Maximum length of 1K.
  + Required: No