diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index ef108df18..0fe68a0ae 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -1484,11 +1484,7 @@ static void misc_config_read(LinphoneCore *lc) {
 	}else if (strcmp(uuid,"0")!=0) /*to allow to disable sip.instance*/
 		sal_set_uuid(lc->sal, uuid);
 
-	/* DTLS: if media_encryption DTLS SRTP is available, get or create the certificate directory */
-	/*if (ms_dtls_srtp_available()){
-		*//*JOHAN: USELESS? REMOVE IT*/
-		//const char *user_certificate_config_path = lp_config_get_string(config,"misc","uuid",);
-//	}*/
+	lc->user_certificates_path=ms_strdup(lp_config_get_string(config,"misc","user_certificates_path","."));
 }
 
 static void linphone_core_start(LinphoneCore * lc) {
@@ -1617,6 +1613,7 @@ static void linphone_core_init(LinphoneCore * lc, const LinphoneCoreVTable *vtab
 	lc->data=userdata;
 	lc->ringstream_autorelease=TRUE;
 
+
 	memcpy(local_vtable,vtable,sizeof(LinphoneCoreVTable));
 	lc->vtables=ms_list_append(lc->vtables,local_vtable);
 
@@ -6760,10 +6757,11 @@ const char *linphone_core_get_zrtp_secrets_file(LinphoneCore *lc){
 }
 
 void linphone_core_set_user_certificates_path(LinphoneCore *lc, const char* path){
-	if (lc->user_certificates_path != NULL) {
-		ms_free(lc->user_certificates_path);
-	}
-	lc->user_certificates_path = path ? ms_strdup(path) : NULL;
+	char* new_value;
+	new_value = path?ms_strdup(path):NULL;
+	if (lc->user_certificates_path) ms_free(lc->user_certificates_path);
+	lp_config_set_string(lc->config,"misc","user_certificates_path",lc->user_certificates_path=new_value);
+	return ;
 }
 
 const char *linphone_core_get_user_certificates_path(LinphoneCore *lc){
diff --git a/tester/call_tester.c b/tester/call_tester.c
index d19161460..9fe4c5913 100644
--- a/tester/call_tester.c
+++ b/tester/call_tester.c
@@ -1584,6 +1584,11 @@ static void video_call_base(LinphoneCoreManager* pauline,LinphoneCoreManager* ma
 		linphone_core_set_video_policy(pauline->lc,&pauline_policy);
 	}
 
+	if (mode==LinphoneMediaEncryptionDTLS) { /* for DTLS we must access certificates or at least have a directory to store them */
+		marie->lc->user_certificates_path = ms_strdup_printf("%s/certificates/marie", liblinphone_tester_file_prefix);
+		pauline->lc->user_certificates_path = ms_strdup_printf("%s/certificates/pauline", liblinphone_tester_file_prefix);
+	}
+
 	linphone_core_set_media_encryption(marie->lc,mode);
 	linphone_core_set_media_encryption(pauline->lc,mode);