diff --git a/Classes/LinphoneCoreSettingsStore.m b/Classes/LinphoneCoreSettingsStore.m
index 3c82e86..97ea78b 100644
--- a/Classes/LinphoneCoreSettingsStore.m
+++ b/Classes/LinphoneCoreSettingsStore.m
@@ -269,6 +269,9 @@ extern void linphone_iphone_log_handler(int lev, const char *fmt, va_list args);
 	LinphoneCore *lc = [LinphoneManager getLc];
 	LinphoneManager* lLinphoneMgr = [LinphoneManager instance];
 	LinphoneProxyConfig* proxyCfg = NULL;
+
+    bool stoppedTimer = [lLinphoneMgr stopTimer];
+    
 	/* unregister before modifying any settings */
     {
         linphone_core_get_default_proxy(lc, &proxyCfg);
@@ -413,6 +416,11 @@ extern void linphone_iphone_log_handler(int lev, const char *fmt, va_list args);
 		linphone_address_destroy(linphoneAddress);
 	}
     [[[LinphoneManager instance] fastAddressBook] reload];
+
+    
+    if (stoppedTimer) {
+        [lLinphoneMgr startTimer];
+    }
 }
 
 + (int)validPort:(int)port {
diff --git a/Classes/LinphoneManager.h b/Classes/LinphoneManager.h
index b90e36f..64a8f3e 100644
--- a/Classes/LinphoneManager.h
+++ b/Classes/LinphoneManager.h
@@ -119,6 +119,8 @@ typedef struct _LinphoneManagerSounds {
 
 - (void)startLibLinphone;
 - (void)destroyLibLinphone;
+- (bool)stopTimer;
+- (bool)startTimer;
 - (BOOL)resignActive;
 - (void)becomeActive;
 - (BOOL)enterBackgroundMode;
diff --git a/Classes/LinphoneManager.m b/Classes/LinphoneManager.m
index 9297622..9ba68ff 100644
--- a/Classes/LinphoneManager.m
+++ b/Classes/LinphoneManager.m
@@ -796,6 +796,27 @@ static LinphoneCoreVTable linphonec_vtable = {
 	linphone_core_iterate(theLinphoneCore);
 }
 
+- (bool)startTimer {
+    if (! mIterateTimer) {
+        mIterateTimer = [NSTimer scheduledTimerWithTimeInterval:0.02
+                                                         target:self
+                                                       selector:@selector(iterate)
+                                                       userInfo:nil
+                                                        repeats:YES];
+        return true;
+    }
+    return false;
+} 
+
+- (bool)stopTimer {
+    if (mIterateTimer) {
+        [mIterateTimer invalidate];
+        mIterateTimer = nil;
+        return true;
+    }
+    return false;
+}
+
 - (void)startLibLinphone {
     if (theLinphoneCore != nil) {
         [LinphoneLogger logc:LinphoneLoggerLog format:"linphonecore is already created"];
@@ -856,11 +877,8 @@ static LinphoneCoreVTable linphonec_vtable = {
     [self setupNetworkReachabilityCallback];
 	
 	// start scheduler
-	mIterateTimer = [NSTimer scheduledTimerWithTimeInterval:0.02
-													 target:self 
-												   selector:@selector(iterate) 
-												   userInfo:nil 
-													repeats:YES];
+    [self startTimer];
+    
 	//init audio session
 	AVAudioSession *audioSession = [AVAudioSession sharedInstance];
 	BOOL bAudioInputAvailable= [audioSession inputIsAvailable];
@@ -931,7 +949,7 @@ static LinphoneCoreVTable linphonec_vtable = {
 }
 
 - (void)destroyLibLinphone {
-	[mIterateTimer invalidate]; 
+	[self stopTimer];
 	//just in case
 	[self removeCTCallCenterCb];