bugfix: calls in K8S may have request-uri like sip:<num>:sbc-sip and that's ok

lib/middleware.js

@@ -194,8 +194,8 @@ module.exports = (srf, logger, opts) => {
     logger.info(`received outbound INVITE to ${req.uri} from server at ${req.server.hostport}`);
     const uri = parseUri(req.uri);
     const desiredRouting = req.get('X-Jambonz-Routing');
-
-    if (!uri || !uri.user || !uri.host) {
+    const validUri = uri && uri.user && uri.host;
+    if (['user', 'sip'].includes(desiredRouting) && !validUri) {
       logger.info({uri: req.uri}, 'invalid request-uri on outbound call, rejecting');
       res.send(400, {
         headers: {