I just got the service today. I have my repeater running through it using Allstar link to a group of other repeaters and have no problem yet. I hope to connect echolink to it as well. I'll check tonight and see if I have any problems and let you know.
From what I gather, you are using Echolink to let people come in and use your HAM to talk to other HAM users in the area? Sadly, if that is the case, it wont be possible with Hughesnet as you are behind CGN (Carrier Grade Network Address Translation), and at the same time, don't have a public facing IP address.
That aside, Hughesnet can't forward ports to you, as this would essentially block the same port for everyone else on your gateway assignment.
Agree with CORROSIVE...... Unless you upgrade to a package with a static IP address, you are dead in the water. UPD (or TCP) ports require an associated IP address, and without a static IP, you will not get your traffic through the NAT'd network.