# 40112: TaskRouter->Call

Log Level: ERROR

## Description

### Possible causes

* You did not provide a "url" parameter on your 'call' instruction.
* You provided an invalid format in your "url" field.

### Possible solutions

* Make certain "url" is provided and contains a well formed HTTP or HTTPS URL.

### Example

```bash
{
	"instruction": "call",
	"to": "client:alice",
	"from": "bob",
	"url": "https://example.com/twiml?querystring=1234"
}
```