diff --git a/Classes/LinphoneCoreSettingsStore.m b/Classes/LinphoneCoreSettingsStore.m
index b3eb2ff30..655f6859e 100644
--- a/Classes/LinphoneCoreSettingsStore.m
+++ b/Classes/LinphoneCoreSettingsStore.m
@@ -102,7 +102,7 @@ extern void linphone_iphone_log_handler(int lev, const char *fmt, va_list args);
 			
 			[self setString: linphone_address_get_username(addr) forKey:@"username_preference"];
 			[self setString: linphone_address_get_domain(addr) forKey:@"domain_preference"];
-            [self setInteger: lp_config_get_int(linphone_core_get_config(lc),"app","default_expires",3600) forKey:@"expire_preference"];
+            [self setInteger: lp_config_get_int(linphone_core_get_config(lc),"default_values","reg_expires",600) forKey:@"expire_preference"];
 			[self setString:linphone_proxy_config_get_dial_prefix(cfg) forKey:@"prefix_preference"];
 			if (strcmp(linphone_address_get_domain(addr),linphone_address_get_domain(proxy_addr))!=0
 				|| port!=NULL){
@@ -355,7 +355,7 @@ extern void linphone_iphone_log_handler(int lev, const char *fmt, va_list args);
 		
 
 		int expire = [self integerForKey:@"expire_preference"];
-		lp_config_set_int(linphone_core_get_config(lc),"app","default_expires",expire);
+		lp_config_set_int(linphone_core_get_config(lc),"default_values","reg_expires",expire);
 		
 		BOOL isWifiOnly = [self boolForKey:@"wifi_only_preference"];
 		
diff --git a/Classes/LinphoneManager.m b/Classes/LinphoneManager.m
index 641c285c5..a2140d4ad 100644
--- a/Classes/LinphoneManager.m
+++ b/Classes/LinphoneManager.m
@@ -501,7 +501,10 @@ void networkReachabilityCallBack(SCNetworkReachabilityRef target, SCNetworkReach
 				&& (lLinphoneMgr.connectivity == newConnectivity || lLinphoneMgr.connectivity == none)) {
 				linphone_proxy_config_expires(proxy, 0);
 			} else if (proxy){
-				linphone_proxy_config_expires(proxy, lp_config_get_int(linphone_core_get_config([LinphoneManager getLc]),"app","default_expires",3600));
+				int defaultExpire = [[LinphoneManager instance] lpConfigIntForKey:@"default_expires"];
+				if (defaultExpire>=0)
+				linphone_proxy_config_expires(proxy, defaultExpire);
+				//else keep default value from linphonecore
 			}
 			
 			if (lLinphoneMgr.connectivity != newConnectivity) {
@@ -1066,6 +1069,10 @@ static LinphoneCoreVTable linphonec_vtable = {
 	lp_config_set_string(linphone_core_get_config(theLinphoneCore),"app",value?[key UTF8String]:NULL, [value UTF8String]);
 }
 -(NSString*)lpConfigStringForKey:(NSString*) key {
+	if (!theLinphoneCore) {
+		[LinphoneLogger log:LinphoneLoggerError format:@"cannot read configuration because linphone core not ready yet"];
+		return nil;
+	};
 	const char* value=lp_config_get_string(linphone_core_get_config(theLinphoneCore),"app",[key UTF8String],NULL);	
 	if (value) 
 		return [NSString stringWithCString:value encoding:[NSString defaultCStringEncoding]];
diff --git a/Resources/linphonerc b/Resources/linphonerc
index 1aa810d4c..5057f2f02 100644
--- a/Resources/linphonerc
+++ b/Resources/linphonerc
@@ -20,3 +20,5 @@ display_filter_auto_rotate=1
 
 
 
+[default_values]
+reg_expires=600
\ No newline at end of file
diff --git a/Resources/linphonerc-factory b/Resources/linphonerc-factory
index c2a9d7950..488ee816c 100644
--- a/Resources/linphonerc-factory
+++ b/Resources/linphonerc-factory
@@ -30,5 +30,3 @@ history_max_size=30
 max_calls=3
 
 
-[default_values]
-reg_expires=600