anchor media on dial if we are recording (#1520)

lib/session/call-session.js

@@ -200,6 +200,10 @@ class CallSession extends Emitter {
     return this.backgroundTaskManager.isTaskRunning('listen');
   }
 
+  get isBackGroundRecord() {
+    return this.backgroundTaskManager.isTaskRunning('record');
+  }
+
   /**
    * SIP call-id for the call
    */

lib/tasks/dial.js

@@ -160,6 +160,7 @@ class TaskDial extends Task {
     const keepAnchor = this.data.anchorMedia ||
       this.isTranscoding ||
       this.cs.isBackGroundListen ||
+      this.cs.isBackGroundRecord ||
       this.cs.onHoldMusic ||
       ANCHOR_MEDIA_ALWAYS ||
       this.listenTask ||