diff --git a/tester/call_single_tester.c b/tester/call_single_tester.c
index c3f65ac5c..691f1dfb1 100644
--- a/tester/call_single_tester.c
+++ b/tester/call_single_tester.c
@@ -305,10 +305,11 @@ bool_t call_with_params2(LinphoneCoreManager* caller_mgr
 							||(caller_mgr->stat.number_of_LinphoneCallOutgoingEarlyMedia==initial_caller.number_of_LinphoneCallOutgoingEarlyMedia+1));
 
 
-	BC_ASSERT_PTR_NOT_NULL(linphone_core_get_current_call_remote_address(callee_mgr->lc));
+	if (linphone_core_get_calls_nb(callee_mgr->lc) == 1)
+		BC_ASSERT_PTR_NOT_NULL(linphone_core_get_current_call_remote_address(callee_mgr->lc)); /*only relevant if one call, otherwise, not always set*/
 	callee_call=linphone_core_get_call_by_remote_address2(callee_mgr->lc,caller_mgr->identity);
 
-	if(!linphone_core_get_current_call(caller_mgr->lc) || !linphone_core_get_current_call(callee_mgr->lc) || !linphone_core_get_current_call_remote_address(callee_mgr->lc)) {
+	if(!linphone_core_get_current_call(caller_mgr->lc) || (!callee_call && !linphone_core_get_current_call(callee_mgr->lc)) /*for privacy case*/) {
 		return 0;
 	} else if (caller_mgr->identity){
 		LinphoneAddress* callee_from=linphone_address_clone(caller_mgr->identity);
@@ -337,7 +338,7 @@ bool_t call_with_params2(LinphoneCoreManager* caller_mgr
 	}
 
 	BC_ASSERT_TRUE(wait_for(callee_mgr->lc,caller_mgr->lc,&callee_mgr->stat.number_of_LinphoneCallConnected,initial_callee.number_of_LinphoneCallConnected+1));
-	BC_ASSERT_TRUE(wait_for(callee_mgr->lc,caller_mgr->lc,&caller_mgr->stat.number_of_LinphoneCallConnected,initial_callee.number_of_LinphoneCallConnected+1));
+	BC_ASSERT_TRUE(wait_for(callee_mgr->lc,caller_mgr->lc,&caller_mgr->stat.number_of_LinphoneCallConnected,initial_caller.number_of_LinphoneCallConnected+1));
 
 	result = wait_for_until(callee_mgr->lc,caller_mgr->lc,&caller_mgr->stat.number_of_LinphoneCallStreamsRunning,initial_caller.number_of_LinphoneCallStreamsRunning+1, 2000)
 			&&
diff --git a/tester/tester.c b/tester/tester.c
index 8e9af1629..131252823 100644
--- a/tester/tester.c
+++ b/tester/tester.c
@@ -850,7 +850,7 @@ static void linphone_conference_server_registration_state_changed(LinphoneCore *
 LinphoneConferenceServer* linphone_conference_server_new(const char *rc_file, bool_t do_registration) {
 	LinphoneConferenceServer *conf_srv = (LinphoneConferenceServer *)ms_new0(LinphoneConferenceServer, 1);
 	LinphoneCoreManager *lm = (LinphoneCoreManager *)conf_srv;
-
+	LinphoneProxyConfig *proxy;
 	conf_srv->vtable = linphone_core_v_table_new();
 	conf_srv->vtable->call_state_changed = linphone_conference_server_call_state_changed;
 	conf_srv->vtable->refer_received = linphone_conference_server_refer_received;
@@ -858,13 +858,17 @@ LinphoneConferenceServer* linphone_conference_server_new(const char *rc_file, bo
 	conf_srv->vtable->user_data = conf_srv;
 	conf_srv->reg_state = LinphoneRegistrationNone;
 	linphone_core_manager_init(lm, rc_file,NULL);
+	if (!do_registration) {
+		proxy = linphone_core_get_default_proxy_config(lm->lc);
+		linphone_proxy_config_edit(proxy);
+		linphone_proxy_config_enable_register(proxy,FALSE);
+		linphone_proxy_config_done(proxy);
+	}
 	linphone_core_add_listener(lm->lc, conf_srv->vtable);
 	linphone_core_manager_start(lm, do_registration);
 	return conf_srv;
 }
 
 void linphone_conference_server_destroy(LinphoneConferenceServer *conf_srv) {
-	linphone_core_manager_uninit((LinphoneCoreManager *)conf_srv);
-	linphone_core_v_table_destroy(conf_srv->vtable);
-	ms_free(conf_srv);
+	linphone_core_manager_destroy((LinphoneCoreManager *)conf_srv);
 }