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Conversation State Transitions - Outbound

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The Conversation state transitions for outbound calls are shown in the following illustration.

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  1. The transition from Idle to Establishing occurs when Call.BeginEstablish executes for the first call bound to the Conversation instance.

  2. The transition from Idle to Conferencing occurs when Conversation.ConferenceSession.BeginJoin is called.

  3. The transition from Establishing to Established occurs when the first call is successfully established by Call.EndEstablish.

  4. The transition from Establishing to Terminating occurs when auto-termination is triggered and all conditions are satisfied. For details, see the explanation immediately following this list.

  5. The transition from Conferencing to Idle occurs when a conferencing failure occurs.

  6. The transition from Established to Terminating occurs when Conversation.BeginTerminate is called or when auto-termination is triggered and all conditions are satisfied. For details, see the explanation immediately following this list.

  7. The transition from Established to Conferencing occurs when Conversation.ConferenceSession.BeginJoin is called to escalate the conversation.

  8. The transition from Conferencing to Terminating occurs when Conversation.BeginTerminate is called.

  9. The transition from Conferencing to Established occurs when there is an escalation failure for the established calls.

  10. The transition from Idle to Terminating occurs when Conversation.BeginTerminate is called or when auto-termination is triggered and all conditions are satisfied. For details, see the explanation immediately following this list.

  11. The transition from Establishing to Idle occurs when a call is terminated while there are other calls that are about to be established.

  12. The transition from Conferencing to Establishing occurs when a conference failure occurs with no calls in the Established state, but at least one call in the Establishing state.

  13. The transition from Conferencing to InLobby occurs when a participant is placed in the lobby of a conference during a conference join.

  14. The transition from InLobby to Idle occurs when a conferencing failure occurs while a participant is in the InLobby state.

  15. The transition from Conferencing to Conferenced occurs when the calls are successfully escalated or when the conversation is successfully joined to the conference session.

  16. The transition from InLobby to Conferenced occurs when a presenter admits a participant from the lobby into the conference.

  17. The transition from Conferenced to Terminating occurs when Conversation.BeginTerminate is called, connection with the conference is disconnected, or a conference participant is ejected from the conference.

  18. The transition from InLobby to Terminating occurs when Conversation.BeginTerminate is called while the participant is in the lobby.

  19. The transition from Terminating to Terminated occurs when Conversation.EndTerminate completes.

Auto-termination is triggered when the last non-idle call in the conversation is terminated or when the ConferenceSession join operation fails.

Auto-termination occurs when all three of the following conditions are satisfied.

  1. All calls bound to the Conversation instance are in the Idle state.

  2. The state of the ConferenceSession instance that is bound to the Conversation instance is neither Connecting nor Connected.

  3. The conversation does not involve an MCU.