Just a heads up that if you are a voip user and have implemented a blacklist list generated by Firehol at this site http://iplists.firehol.org/
your voip may stop working

For my MikroTik Routers I created a blacklist today using Firehol and after implementing all my voip.ms DID's failed to register. Did some investigating and sure enough a few voip.ms servers are caught up in this blacklist. I have informed voip.ms of this situation so that they can work it out with Firehol .... I strongly suspect that many other voip providers are in the same situation with lists from FireHol.

That's why Its important to whitelist trusted traffic before the blacklist drop rule.