-(void) stopRecording {
if (_disableSpeechSW == YES) {
    return;
}
if (_isAuthorization == NO) {
    return;
}
 
NSLog(@"stopRecording");
 
if ([_audioEngine isRunning]) {
    [_audioEngine stop];
    [_recognitionRequest endAudio];
}

}

-(void) startRecording {
..........
[_speechRecognizer recognitionTaskWithRequest:_recognitionRequest
                   resultHandler:^(SFSpeechRecognitionResult *result,NSError *error){
  if (error != nil ) {
     NSLog(@"%@",[error description]);
  }
  else {
   ..........
  }
}];}

[Utility] +[AFAggregator logDictationFailedWithError:] Error
Domain=kAFAssistantErrorDomain Code=203 “Retry”
UserInfo={NSLocalizedDescription=Retry,NSUnderlyingError=0x17424c690
{Error Domain=SiriSpeechErrorDomain Code=1 “(null)”}}