> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes.

# RelayError

> Error thrown when the Relay server returns an error.

Custom error class for Relay protocol errors. Extends JavaScript's built-in `Error`
class. The `name` property is always `"RelayError"`.

```typescript {1}
import { RelayError } from '@signalwire/sdk';
```

## **Properties**

**`code`** `number`

Numeric error code returned by the Relay server.

---

**`message`** `string`

`"RELAY error {code}: {serverMessage}"`. The standard `Error` message,
prefixed with the code.

---

**`serverMessage`** `string`

The server's own error text, without the `RELAY error` prefix. Read this to
match on or display the server's wording.

---

**`name`** `string`

Always `"RelayError"`.

---

## **Examples**

### Catch a Relay error

```typescript {9}
import { RelayClient, RelayError } from '@signalwire/sdk';

const client = new RelayClient({
  project: process.env.SIGNALWIRE_PROJECT_ID!,
  token: process.env.SIGNALWIRE_API_TOKEN!,
  contexts: ['default'],
});

client.onCall(async (call) => {
  try {
    await call.connect(
      [[{ type: 'phone', params: { to_number: '+15559876543' } }]],
    );
  } catch (e) {
    if (e instanceof RelayError) {
      console.log(`Error ${e.code}: ${e.message}`);
    }
    await call.hangup();
  }
});

await client.run();
```

> Error thrown when the Relay server returns an error.