dont check limits on self-hosted deployments

lib/middleware.js

@@ -90,7 +90,10 @@ module.exports = (srf, logger, opts) => {
 
       const capacities = await lookupAccountCapacitiesBySid(account_sid);
       const limit = capacities.find((c) => c.category == 'voice_call_session');
-      if (!limit) throw new Error('no account_capacities found');
+      if (!limit) {
+        logger.debug('checkLimits: no call limits specified');
+        return next();
+      }
       const limit_sessions = limit.quantity;
 
       if (calls > limit_sessions) {