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@llm.ai_callable()
    async def send_dtmf_code(
        self,
        code: Annotated[
            int, llm.TypeInfo(
                description="The DTMF code to send to the phone number for the current step.")
        ],
    ):
This was used in 0.x version what can be used in version 1.x

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In LiveKit version 1.x, the `send_dtmf_code` function from earlier versions or custom implementations can be replaced with the official `publish_dtmf` method. This method is available across multiple SDKs and is the standard way to send DTMF tones. Below are examples for different languages:
*Python:*
```await room.local_participant.publish_dtmf(
    code=code,
    digit=str(code)
)```
*JavaScript/TypeScript:*
```await localParticipant.publishDtmf(code, digit);```
*Node.js:*
```await localParticipant.publishDtmf(code, digit);```
*Android:*
```localParticipant.publishDtmf(code, digit)```
If you were using a custom `send_dtmf_code` function, you can directly call `publish_dtmf` with the numeric code and its string representation. This ensures compatibility with various SIP implementations.
 Sources: <https://docs.livekit.io/recipes/ivr-navigator/|Building an Automated IVR Menu Caller | LiveKit Docs> | <https://github.com/livekit/client-sdk-js/blob/b3cf0a61b5ace261897258406ed47c03435e64b8/src/room/participant/LocalParticipant.ts#L1673-L1740|src/room/participant/LocalParticipant.ts> | <https://github.com/livekit/node-sdks/blob/7b6808a5eb5ee20b9f5914ef85b777cb71ba8743/packages/livekit-rtc/src/participant.ts#L1-L70|packages/livekit-rtc/src/participant.ts> | <https://github.com/livekit/client-sdk-android/blob/c6c0728d04a74c62012cf9ce50ee9e70415d8afc/livekit-android-sdk/src/main/java/io/livekit/android/room/participant/LocalParticipant.kt#L907-L953|livekit-android-sdk/src/main/java/io/livekit/android/room/participant/Local...> | <https://docs.livekit.io/sip/dtmf|Handling DTMF | LiveKit Docs>