I learned that lesson the hard way. My pbx got abused and I got a huge bill. VPN is the only way to go.personally i only allow external access to voip server using vpns to lower the risk
That's why in the mtcna they teach to do it from scratch. Love it!its important learn to config the router beyond quickset to take full advantage of the functionalities
It gives me headaches... [emoji37]Look the Ubiquiti PicoStation HP (high Power), configure like US and you will enjoy the wirelesss coverage.