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when doing outbound call how to know if user is busy and didn't lift the call?

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When making outbound calls, you can determine if a user is busy or didn't answer based on the disconnect reasons:
• *USER_UNAVAILABLE*: Indicates that the SIP callee did not respond in time (no answer).
• *USER_REJECTED*: Indicates that the SIP callee rejected the call or was busy.
These disconnect reasons can be accessed through the `disconnect_reason` property of a participant object in SIP calling scenarios.
 Sources: <https://docs.livekit.io/python/livekit/rtc/participant.html|livekit.rtc.participant API documentation> | <https://github.com/livekit/livekit_composite/blob/4b437f6db613b41c9f1fb00a45d3f11b4a24970b/knowledge_base/how_to_detect_and_handle_silence_during_calls.md#L1-L53|GitHub::livekit::livekit_composite | knowledge_base/how_to_detect_and_handl...>