OptionalactivityDefines what effect activity has.
OptionalautomaticIf not set, automatic activity detection is enabled by default. If automatic voice detection is disabled, the client must send activity signals.
OptionalinterimIf true, enables interim transcript timestamps.
OptionalturnDefines which input is included in the user's turn.
Marks the end of user activity.
This can only be sent if automatic (i.e. server-side) activity detection is disabled.