fixed dial transcribe is not able to received final transcribe when c…

…lose call.

lib/utils/place-outdial.js

@@ -358,6 +358,25 @@ class SingleDialer extends Emitter {
         this.logger.info(err, 'place-outdial:_configMsEndpoint - error enable inband DTMF');
       }
     }
+
+    const origDestroy = this.ep.destroy.bind(this.ep);
+    this.ep.destroy = async() => {
+      try {
+        if (this.dialTask.transcribeTask) {
+          // Wait for final transcription before destroying endpoint
+          // some vendor may take some time to send the final transcription when closing the connectin
+          // if there is final transcription but the endpoint is destroyed, the transcription will be lost
+
+          // wait for maximum 1 second, if the transcription is not received, destroy the endpoint
+          this.logger.info('SingleDialer:_configMsEndpoint -' +
+            ' Dial with transcribe task, wait for some time before destroy');
+          await new Promise((resolve) => setTimeout(resolve, 1000));
+        }
+        await origDestroy();
+      } catch (err) {
+        this.logger.error(err, 'SingleDialer:_configMsEndpoint - error destroying endpoint');
+      }
+    };
   }
 
   /**