Hello Jaguar9,
Generally with cordless phone sets you get a "base station" like the one I've (horribly) circled in red here:
All you would need to do is connect that base station to the HughesNet Voice ATA for all of the cordless phones to work! If you get a multi-phone set like the one in the picture, the bases are usually free standing, so if you don't like where you set up one of the phones you can always just plug it in somewhere else or charge the handset in another room if needed. Otherwise, plug the base station into your ATA, charge the handset and you are free to roam around with it.
~Amanda
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