diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index 93cf6dc01..f8ca71bd2 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -4174,6 +4174,9 @@ int linphone_core_get_inc_timeout(LinphoneCore *lc){
 **/
 void linphone_core_set_in_call_timeout(LinphoneCore *lc, int seconds){
 	lc->sip_conf.in_call_timeout=seconds;
+	if( linphone_core_ready(lc)){
+		lp_config_set_int(lc->config, "sip", "in_call_timeout", seconds);
+	}
 }
 
 /**