# 40110: TaskRouter->Call

Log Level: ERROR

## Description

### Possible causes

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

### Possible solutions

* Make certain "to" contains a valid phone number, client URI, or SIP URI.

### Example

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