res_pjsip: Add/update ERROR msg if invalid URI.

ASTERISK-24499

Change-Id: Ie305153e47e922233b2ff24715e0e326e5fa3a6c

res/res_pjsip.c

@@ -2911,7 +2911,8 @@ pjsip_dialog *ast_sip_create_dialog_uac(const struct ast_sip_endpoint *endpoint,
 	res = pjsip_dlg_create_uac(pjsip_ua_instance(), &local_uri, NULL, &remote_uri, &target_uri, &dlg);
 	if (res != PJ_SUCCESS) {
 		if (res == PJSIP_EINVALIDURI) {
-			ast_log(LOG_ERROR, "Could not create dialog to endpoint '%s' as URI '%s' is not valid\n",
+			ast_log(LOG_ERROR,
+				"Endpoint '%s': Could not create dialog to invalid URI '%s'.  Is endpoint registered?\n",
 				ast_sorcery_object_get_id(endpoint), uri);
 		}
 		return NULL;

res/res_pjsip_session.c

@@ -1738,6 +1738,8 @@ struct ast_sip_session *ast_sip_session_create_outgoing(struct ast_sip_endpoint
 
 	/* If we still have no URI to dial fail to create the session */
 	if (ast_strlen_zero(uri)) {
+		ast_log(LOG_ERROR, "Endpoint '%s': No URI available.  Is endpoint registered?\n",
+			ast_sorcery_object_get_id(endpoint));
 		return NULL;
 	}