Only hide the volume view when the InCall view appears and until further call updates arrive.

Classes/InCallViewController.m

@@ -36,7 +36,9 @@
 
 const NSInteger SECURE_BUTTON_TAG=5;
 
-@implementation InCallViewController
+@implementation InCallViewController {
+    BOOL hiddenVolume;
+}
 
 @synthesize callTableController;
 @synthesize callTableView;
@@ -116,6 +118,9 @@ static UICompositeViewDescription *compositeDescription = nil;
     [[UIApplication sharedApplication] setIdleTimerDisabled:YES];
     UIDevice *device = [UIDevice currentDevice];
     device.proximityMonitoringEnabled = YES;
+
+    [[PhoneMainView instance] setVolumeHidden:TRUE];
+    hiddenVolume = TRUE;
 }
 
 - (void)viewWillDisappear:(BOOL)animated {
@@ -128,6 +133,10 @@ static UICompositeViewDescription *compositeDescription = nil;
         [callTableController viewWillDisappear:animated];
     }
     
+    if( hiddenVolume ) {
+        [[PhoneMainView instance] setVolumeHidden:FALSE];
+        hiddenVolume = FALSE;
+    }
     
     // Remove observer
     [[NSNotificationCenter defaultCenter] removeObserver:self 
@@ -211,6 +220,12 @@ static UICompositeViewDescription *compositeDescription = nil;
 
 - (void)callUpdate:(LinphoneCall *)call state:(LinphoneCallState)state animated:(BOOL)animated {
 	LinphoneCore *lc = [LinphoneManager getLc];
+
+    if( hiddenVolume ){
+        [[PhoneMainView instance] setVolumeHidden:FALSE];
+        hiddenVolume = FALSE;
+    }
+
     // Update table
     [callTableView reloadData];  
     

Classes/PhoneMainView.h

@@ -68,6 +68,7 @@
 - (void)updateStatusBar:(UICompositeViewDescription*)to_view;
 - (void)startUp;
 - (void)displayIncomingCall:(LinphoneCall*) call;
+- (void)setVolumeHidden:(BOOL)hidden;
 
 - (void)addInhibitedEvent:(id)event;
 - (BOOL)removeInhibitedEvent:(id)event;

Classes/PhoneMainView.m

@@ -90,11 +90,9 @@ static PhoneMainView* phoneMainViewInstance=nil;
     
     [super viewDidLoad];
 
-    // insert invisible volumeView to prevent iOS from displaying the volume notification all the time.
     volumeView = [[MPVolumeView alloc] initWithFrame: CGRectMake(-100,-100,16,16)];
     volumeView.showsRouteButton = false;
     volumeView.userInteractionEnabled = false;
-    [self.view addSubview:volumeView];
 
     [self.view addSubview: mainViewController.view];
 }
@@ -181,6 +179,20 @@ static PhoneMainView* phoneMainViewInstance=nil;
     loadCount--;
 }
 
+- (void)setVolumeHidden:(BOOL)hidden {
+    // sometimes when placing a call, the volume view will appear. Inserting a
+    // carefully hidden MPVolumeView into the view hierarchy will hide it
+    if( hidden ){
+        if ( !(volumeView.superview == self.view) ){
+            [self.view addSubview:volumeView];
+        }
+    } else {
+        if( volumeView.superview == self.view ){
+            [volumeView removeFromSuperview];
+        }
+    }
+}
+
 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
     if(interfaceOrientation == self.interfaceOrientation)
         return YES;