diff -dur asterisk-13.5.0.orig/res/res_pjsip/pjsip_configuration.c asterisk-13.5.0/res/res_pjsip/pjsip_configuration.c
--- asterisk-13.5.0.orig/res/res_pjsip/pjsip_configuration.c	2015-09-22 13:40:58.514099218 +0200
+++ asterisk-13.5.0/res/res_pjsip/pjsip_configuration.c	2015-09-22 13:46:48.650282205 +0200
@@ -467,6 +467,8 @@
 	while ((val = strsep(&idents, ","))) {
 		if (!strcasecmp(val, "username")) {
 			endpoint->ident_method |= AST_SIP_ENDPOINT_IDENTIFY_BY_USERNAME;
+		} else if (!strcasecmp(val, "no-username")) {
+			endpoint->ident_method &= ~AST_SIP_ENDPOINT_IDENTIFY_BY_USERNAME;
 		} else {
 			ast_log(LOG_ERROR, "Unrecognized identification method %s specified for endpoint %s\n",
 					val, ast_sorcery_object_get_id(endpoint));
@@ -482,6 +484,8 @@
 	switch (endpoint->ident_method) {
 	case AST_SIP_ENDPOINT_IDENTIFY_BY_USERNAME :
 		*buf = "username"; break;
+	case 0 :
+		*buf = "no-username"; break;
 	default:
 		return 0;
 	}