diff --git a/Classes/LinphoneUI/UIDigitButton.m b/Classes/LinphoneUI/UIDigitButton.m
index a3b5eded9..7470307db 100644
--- a/Classes/LinphoneUI/UIDigitButton.m
+++ b/Classes/LinphoneUI/UIDigitButton.m
@@ -38,8 +38,8 @@
 	} else {
 		linphone_core_send_dtmf([LinphoneManager getLc],mDigit);	
 	}
-	
 }
+
 -(void) touchUp:(id) sender {
 	linphone_core_stop_dtmf([LinphoneManager getLc]);
 	if (mDigit == '0') {
diff --git a/Classes/PhoneViewController.h b/Classes/PhoneViewController.h
index 84e77b4c0..f9c2e7583 100644
--- a/Classes/PhoneViewController.h
+++ b/Classes/PhoneViewController.h
@@ -64,6 +64,7 @@
 	IncallViewController *myIncallViewController;
 	UIActionSheet *mIncomingCallActionSheet;
 	FirstLoginViewController* myFirstLoginViewController;
+	NSTimer *dtmf_warmup;
 	
 }
 @property (nonatomic, retain) IBOutlet UITextField* address;
diff --git a/Classes/PhoneViewController.m b/Classes/PhoneViewController.m
index aaf2d6fbc..a72c4533a 100644
--- a/Classes/PhoneViewController.m
+++ b/Classes/PhoneViewController.m
@@ -79,6 +79,16 @@
  return self;
  }
  */
+
+
+- (void)dtmfWarmup{
+	@try {
+		linphone_core_play_dtmf([LinphoneManager getLc], ' ', 50);
+	} @catch (NSException *e) {
+		//nop
+	}
+}
+
 - (void)viewDidAppear:(BOOL)animated {
 	[[UIApplication sharedApplication] setIdleTimerDisabled:true];
 	[mute reset];
@@ -88,10 +98,27 @@
 		[[LinphoneManager instance] setRegistrationDelegate:myFirstLoginViewController];
 		[self presentModalViewController:myFirstLoginViewController animated:true];
 	}; 
-	
+	/*
+	 BIG HACK !!
+	 The audio unit takes a lot of time to start, especially on iphone 3G
+	 To prevent a one second delay while playing the first digit, we need to activate
+	 the linphonecore graph responsible to play the dtmfs
+	 */
+	//[self dtmfWarmup];
+	NSDate *soon=[NSDate dateWithTimeIntervalSince1970:(time(NULL)+1)];
+	dtmf_warmup = [[NSTimer alloc] initWithFireDate:soon
+										   interval:4
+											 target:self 
+										   selector:@selector(dtmfWarmup)
+										   userInfo:nil 
+											repeats:YES];
+	[[NSRunLoop currentRunLoop] addTimer:dtmf_warmup
+								 forMode:NSDefaultRunLoopMode];
 }
+
 - (void)viewDidDisappear:(BOOL)animated {
 	[[UIApplication sharedApplication] setIdleTimerDisabled:false];
+	[dtmf_warmup invalidate];
 }
 
 
diff --git a/submodules/linphone b/submodules/linphone
index f89550038..6cd830fda 160000
--- a/submodules/linphone
+++ b/submodules/linphone
@@ -1 +1 @@
-Subproject commit f89550038a73df8d7ded83252401fea09afd65ba
+Subproject commit 6cd830fda4252457082f5b5be6909b573e11fd91