respect silence switch for incoming ringing

// FREEBIE

Signal/src/view controllers/CallViewController.swift

@@ -57,15 +57,29 @@ import PromiseKit
 
     private func handleLocalRinging() {
         Logger.debug("\(TAG) \(#function)")
-
         audioManager.setAudioEnabled(true)
         audioManager.handleInboundRing()
+        do {
+            // Respect silent switch.
+            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategorySoloAmbient)
+            Logger.debug("\(TAG) set audio category to SoloAmbient")
+        } catch {
+            Logger.error("\(TAG) failed to change audio category to soloAmbient in \(#function)")
+        }
+
         vibrateTimer = Timer.scheduledTimer(timeInterval: vibrateRepeatDuration, target: self, selector: #selector(vibrate), userInfo: nil, repeats: true)
     }
 
     private func handleConnected() {
         Logger.debug("\(TAG) \(#function)")
         stopRinging()
+        do {
+            // Start recording
+            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord)
+            Logger.debug("\(TAG) set audio category to PlayAndRecord")
+        } catch {
+            Logger.error("\(TAG) failed to change audio category to soloAmbient in \(#function)")
+        }
     }
 
     private func handleLocalFailure() {