Use Cases for Testing Restrictoutboundnetworkaccess for Speech Service

Transcribing an Audio File from a Storage Account Using the Speech Service

UseCase 1 – Azure Speech Service Outbound access not restricted

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1. Prepare the Audio File: Upload the audio file to your storage account and note its URL. We can take sample file from here: cognitive-services-speech-sdk/sampledata/audiofiles at master · Azure-Samples/cognitive-services-speech-sdk · GitHub
   
2. Set Up the Speech Service: Obtain the API key and endpoint URL from your speech service in Azure as below reference
   

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3. Make the GET Request: Follow below steps in Postman to make a POST request to Speech Service

• Open Postman and create a new POST request.
  
• Set the URL to https://<SpeechServiceLocation>.api.cognitive.microsoft.com/speechtotext/v3.2/transcriptions.
  
• Add Headers:
  Ocp-Apim-Subscription-Key: <keyOfSpeechService>
  Content-Type: application/json
  
• Set the Body to raw and select JSON format.
  Then, paste the following JSON:
  

{

"contentUrls": [

"SASLinkToAudioFileOnStorage"

],

"locale": "en-US",

"displayName": "My Transcription",

"model": null,

"properties": {

"wordLevelTimestampsEnabled": true,

"languageIdentification": {

"candidateLocales": [

"en-US", "de-DE", "es-ES"

]

}

}

}

The Post Request will return a status code of 201 as shown – it indicates that the request was successfully processed, and a new transcription job has been created. This status code confirms that the transcription process has been initiated

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In the response body of the POST request, find the URL provided under the ‘Links’ section and make a GET request to that URL.

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The response from this GET request will contain a contentUrl, which you need to use to make another request to fetch the transcribed data

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Since the outbound access was not disabled, we were able to fetch the Transcribed data from speech service.

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UseCase 2 – Azure Speech Service Outbound access is restricted

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Repeat the steps as mentioned in UseCase1 to send POST request to Speech Service.

The request will return a status code of 403.This means that we are not allowed to access Audio File from Storage account because here we have mentioned - restrictOutboundNetworkAccess": true, and "allowedFqdnList": "microsoft.com" which means we have restricted outbound access and speech service can only access “microsoft.com” only.

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