Probably the place to start is with a CAREFUL review of how the various devices are connected.
It is easy to get WAN ports and LAN ports and Phone 1 and Phone 2 connections mixed up
here is one diagram:
(click on picture for larger image)
But I would encourage you to get the entire PDF and look at the progressive pictures and validate each connection and port as you go.
That can be found here:
http://customer.kb.hughesnet.com/Documents/1041087-0001_a.pdf