> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cognigy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# USER_BUSY

> This event triggers when the user is busy (SIP 603) and can't answer or accept the call transfer.

This event indicates that the user was busy and could not answer the call or engage in the desired action.

For instance, if an automated voice application tries to transfer the call to a human agent, but the user is already on another call, the `USER_BUSY` event would be logged or recorded.

Payload:

```json theme={null}
{
  "payload": {
    "call_sid": "e234f07d-e7e7-407a-xxxx-xxxxxxxxxxxx",
    "direction": "outbound",
    "from": "441xxxxxxxxx",
    "to": "441xxxxxxxxx",
    "call_id": "aa901330-cbf4-123c-xxxx-xxxxxxxxxxxx",
    "sip_status": 603,
    "sip_reason": "Decline",
    "call_status": "busy",
    "account_sid": "b507f72e-be93-4802-xxxx-xxxxxxxxxxxx",
    "trace_id": "79a6573cf277a174c648c89bd0676dc8",
    "application_sid": "34b16acb-9b93-4312-xxxx-xxxxxxxxxxxx",
    "fs_sip_address": "10.1.193.xx:xxxx",
    "api_base_url": "voice-gateway.cognigy.ai/v1"
  },
  "msgid": "4dPkLyVhcK8bTxUoJFDXhm",
  "event": "USER_BUSY"
}
```

## More Information

* [Hangup](/voice-gateway/references/verbs/hangup)