protected override async Task OnMessageActivityAsync(ITurnContext <IMessageActivity> turnContext, CancellationToken cancellationToken)
{
if (turnContext.Activity.Attachments != null)
{
var url = turnContext.Activity.Attachments[0].ContentUrl;
var transcribed = await SpeechRecognizer.RecognizeSpeechAsync(url);
if (transcribed != "")
{
await turnContext.SendActivityAsync("You said: " + transcribed);
}
turnContext.Activity.Text = transcribed;
}
else
{
await turnContext.SendActivityAsync("I can understand voice messages, try me.");
}
}