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What does `wait_until_answered` do within CreateSIPParticipantRequest.

Also, tell me the difference between `play_dialtone`  and `play_ringtone`  within CreateSIPParticipantRequest

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The `wait_until_answered` parameter in `CreateSIPParticipantRequest` is a boolean option. When set to `true`, it ensures that the request waits until the outbound call is answered before proceeding. This is useful for scenarios where you need confirmation that the call has been picked up before continuing with further actions.
Regarding the difference between `play_dialtone` and `play_ringtone`:
• `play_dialtone`: When set to `true`, it plays a dial tone to the room until the phone is picked up.
• `play_ringtone`: This option is deprecated. It is recommended to use `play_dialtone` instead for the same functionality. Sources: <https://docs.livekit.io/agents/start/telephony/|Agents telephony integration | LiveKit Docs> | <https://docs.livekit.io/server-sdk-js/interfaces/CreateSipParticipantOptions.html|CreateSipParticipantOptions | LiveKit JS Server SDK - v2.9.7> | <https://docs.livekit.io/server-sdk-js/interfaces/CreateSipParticipantOptions.html|CreateSipParticipantOptions | LiveKit JS Server SDK - v2.9.7>