> 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.

# answer

> Add an answer verb to the SWML document.

Add an `answer` verb to the main section. Answers an incoming call.

## **Parameters**

**`config`** `Record<string, unknown> | undefined`

Optional configuration object for the answer verb. Supported keys:

* `max_duration` (`number`) -- Maximum call duration in seconds.
* `codecs` (`string`) -- Comma-separated list of codecs to offer. Valid codecs: `PCMU`, `PCMA`, `G722`, `G729`, `AMR-WB`, `OPUS`, `VP8`, `H264`.
* `username` (`string`) -- Username for SIP authentication.
* `password` (`string`) -- Password for SIP authentication.

---

## **Returns**

`this` -- The builder instance for method chaining.

## **Example**

```typescript {4}
import { SwmlBuilder } from '@signalwire/sdk';

const builder = new SwmlBuilder();
builder.answer({ max_duration: 3600 });
builder.play({ url: 'https://example.com/audio.mp3' });
builder.hangup();
```

> Add an answer verb to the SWML document.