Create call-transcription-web.md

Author: tomaschladek

articles/communication-services/how-tos/calling-sdk/includes/call-transcription/call-transcription-web.md

@@ -0,0 +1,36 @@
+---
+author: tomaschladek
+ms.service: azure-communication-services
+ms.topic: include
+ms.date: 08/08/2024
+ms.author: tchladek
+---
+
+## Call transcription 
+
+`Transcription` is an extended feature of the class `Call`. You first need to obtain the transcription feature API object
+
+```js
+const callTranscriptionApi = call.api(Features.Transcription);
+```
+
+You can check state of the transcription in the property `isTranscriptionActive`. If value is set to `true`, then transcription is active.
+
+```js
+const isTranscriptionActive = callTranscriptionApi.isTranscriptionActive;
+```
+
+You can subscribe to event, that is triggered when state of transcription changes:
+
+```js
+const isTranscriptionActiveChangedHandler = () => {
+  console.log(callTranscriptionApi.isTranscriptionActive);
+};
+callRecordingApi.on('isTranscriptionActiveChanged', isTranscriptionActiveChangedHandler);
+```
+
+You can unsubscribe from the event with the following code: 
+
+```js
+callRecordingApi.off('isTranscriptionActiveChanged', isTranscriptionActiveChangedHandler);
+```