diff --git a/Classes/LinphoneAppDelegate.m b/Classes/LinphoneAppDelegate.m
index 3b3b22d79..33832b435 100644
--- a/Classes/LinphoneAppDelegate.m
+++ b/Classes/LinphoneAppDelegate.m
@@ -27,13 +27,6 @@
 #include "LinphoneManager.h"
 #include "linphonecore.h"
 
-#if __clang__ && __arm__
-extern int __divsi3(int a, int b);
-int __aeabi_idiv(int a, int b) {
-	return __divsi3(a,b);
-}
-#endif
-
 @implementation UILinphoneWindow
 
 @end
diff --git a/Classes/LinphoneUI/UIVideoButton.h b/Classes/LinphoneUI/UIVideoButton.h
index 759911f00..a7b4be5db 100644
--- a/Classes/LinphoneUI/UIVideoButton.h
+++ b/Classes/LinphoneUI/UIVideoButton.h
@@ -24,9 +24,6 @@
 @interface UIVideoButton : UIToggleButton<UIToggleButtonDelegate> {
 }
 
-@property (assign) BOOL locked;
-@property (assign) BOOL unlockVideoState;
-
 @property (nonatomic, retain) IBOutlet UIActivityIndicatorView*  waitView;
 
 @end
diff --git a/Classes/LinphoneUI/UIVideoButton.m b/Classes/LinphoneUI/UIVideoButton.m
index 2368b9bfa..6100bc7da 100644
--- a/Classes/LinphoneUI/UIVideoButton.m
+++ b/Classes/LinphoneUI/UIVideoButton.m
@@ -22,13 +22,9 @@
 
 @implementation UIVideoButton
 
-@synthesize locked;
-@synthesize unlockVideoState;
 @synthesize waitView;
 
 - (void)initUIVideoButton {
-    locked = FALSE;
-    unlockVideoState = FALSE;
 }
 
 - (id)init{
@@ -68,8 +64,6 @@
     
     [self setEnabled: FALSE];
     [waitView startAnimating];
-    [self setLocked: TRUE];
-    [self setUnlockVideoState: TRUE];
     
     LinphoneCall* call = linphone_core_get_current_call([LinphoneManager getLc]);
 	if (call) { 
@@ -95,8 +89,6 @@
     
     [self setEnabled: FALSE];
     [waitView startAnimating];
-    [self setLocked: TRUE];
-    [self setUnlockVideoState: FALSE];
     
     LinphoneCall* call = linphone_core_get_current_call([LinphoneManager getLc]);
 	if (call) { 
@@ -116,26 +108,28 @@
             LinphoneCall* currentCall = linphone_core_get_current_call([LinphoneManager getLc]);
             if (currentCall) {
                 LinphoneCallState state = linphone_call_get_state(currentCall);
-                if (state == LinphoneCallStreamsRunning || state == LinphoneCallUpdated || state == LinphoneCallUpdatedByRemote) {
-                    if (linphone_call_params_video_enabled(linphone_call_get_current_params(currentCall))) {
-                        val = true;
-                        if(locked && unlockVideoState) {
-                            locked = FALSE;
-                            [waitView stopAnimating];
-                        }
-                    } else {
-                        if(locked && !unlockVideoState) {
-                            locked = FALSE;
-                            [waitView stopAnimating];
-                        }
+                switch (state) {
+                    case LinphoneCallUpdated:
+                    {
+                        [waitView stopAnimating];
                     }
-                    if(!locked) {
+                    case LinphoneCallStreamsRunning:
+                    {
                         [self setEnabled:TRUE];
+                        if (linphone_call_params_video_enabled(linphone_call_get_current_params(currentCall))) {
+                            val = true;
+                        }
+                        break;
                     }
-                } else {
-                    // Disable button if the call is not running
-                    [self setEnabled:FALSE];
-                    [waitView stopAnimating];
+                        
+                    default:
+                    {
+                        // Disable button if the call is not running
+                        [self setEnabled:FALSE];
+                        [waitView stopAnimating];
+                        break;
+                    }
+
                 }
             } else {
                 // Disable button if there is no call
diff --git a/linphonerc b/linphonerc
index 543d5f376..0cb29e0e9 100644
--- a/linphonerc
+++ b/linphonerc
@@ -35,6 +35,7 @@ playback_dev_id=AU: Audio Unit Receiver
 ringer_dev_id=AQ: Audio Queue Device
 capture_dev_id=AU: Audio Unit Receiver
 echocancellation=0
+dtmf_player_amp=0.007
 
 [misc]
 history_max_size=30
diff --git a/linphonerc-ipad b/linphonerc-ipad
index 98ddaeba2..fcc5736c0 100644
--- a/linphonerc-ipad
+++ b/linphonerc-ipad
@@ -33,6 +33,7 @@ playback_dev_id=AU: Audio Unit Receiver
 ringer_dev_id=AQ: Audio Queue Device
 capture_dev_id=AU: Audio Unit Receiver
 echocancellation=0
+dtmf_player_amp=0.007
 
 [misc]
 history_max_size=30
diff --git a/submodules/linphone b/submodules/linphone
index 0a12fa9ce..75040297c 160000
--- a/submodules/linphone
+++ b/submodules/linphone
@@ -1 +1 @@
-Subproject commit 0a12fa9ce7af5c795722ce1f7ebad9bc85314d3b
+Subproject commit 75040297c12e118cea0ec87d2bc3980c290f8e86
diff --git a/submodules/mssilk b/submodules/mssilk
index 391b6d6b0..d3a6a0a13 160000
--- a/submodules/mssilk
+++ b/submodules/mssilk
@@ -1 +1 @@
-Subproject commit 391b6d6b0fdf6854e5a25f287c4d8461730a1d40
+Subproject commit d3a6a0a130730c0eaf9a0b6ed2fc466432852684