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Trunking Recorder Call Transcribe

Call Transcribe enables selected recorded calls to be transcribed using the Microsoft Azure Speech-to-text services. Calls that trigger a Call notification email will also automatically be transcribed.

The Call Transcribe feature does requires a Azure Cognitive Services subscription.
Free (F0) subscriptions currently offers 5 audio hours free per month.
Paid standard (S0) subscriptions cost roughly $1 per audio hour.
To verify currently pricing check Azure for more information.

Note: Azure requires WAV files, when recording Unitrunker calls as MP3 files a WAV file will also be recorded automatically. If importing Calls from SDRTrunk or ProScan as MP3 files they will automatically be converted to WAV as needed. All WAV files will be deleted once Call Notification is complete.

To enable Call Transcribe:

  1. Create and setup an Azure subscription. AZURE - Create one for free
  2. Create the Speech resource in Azure generating the Azure Key and Region information. AZURE - Create a Speech resource in the Azure portal.
  3. From the Configure menu select the "Transcribe" tab.
  4. Check the "Enable Call Transcribe" checkbox
  5. Enter your Azure subscription key that you generated on the Azure portal website.
  6. Enter your Azure region information as displayed on the Azure portal website.
  7. Select the Talkgroups which should be transcribed after each call is recorded.
  8. Click the "Keyword Phrases" tab and enter any extra keyword phrases you need to help improve accuracy of the speech recognition. After a few calls have been processed, you will start to notice if extra phrases are needed.
  9. Trunking Recorder Advanced configuration screen
  10. Click the "Save" button, Trunking Recorder will attempt to verify that the Microsoft Visual C++ 2019 Redistributable 64-bit is installed. If not, it will display a message allowing you to download the file from Microsoft.
  11. Install the Microsoft Visual C++ 2019 Redistributable 64-bit if you were prompted.
  12. If configured correctly all newly recorded calls for the selected Talkgroups will display the call transcription text on the Trunking Recorder Web Interface. Note: Transcribed Calls will display a green colored plus sign to the left of the time. Click the plus sign to expand the Call details.
  13. Trunking Recorder Web Interface with Call Text
  14. Also, all new Call notification emails will include the transcribed call text in the email.
  15. If any errors are encountered, they will be logged in the Trunking Recorder log file.


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