SpeechToTextSpeakerLabels Property

NON-MULTIPART ONLY: Indicates whether labels that identify which words were spoken by which participants in a multi-person exchange are to be included in the response. If true, speaker labels are returned; if false (the default), they are not. Speaker labels can be returned only for the following language models: en-US_NarrowbandModel, en-US_BroadbandModel, es-ES_NarrowbandModel, es-ES_BroadbandModel, ja-JP_NarrowbandModel, and ja-JP_BroadbandModel. Setting speaker_labels to true forces the timestamps parameter to be true, regardless of whether you specify false for the parameter.

public bool SpeakerLabels { get; set; }