I would first check to make sure that all cables are securely in place. If they are, the next step is to power cycle your HughesNet equipment.
1. After turning off any connected devices (desktop computer, laptop, etc), unplug the HughesNet Voice unit from the power outlet, then unplug the HughesNet modem from the power outlet.
2. After waiting at least a minute, which gives the modem time to purge any temporary settings, plug the HughesNet modem back in.
3. After waiting for at least five minutes, which gives the HughesNet modem time to be fully back up and ready, plug the HughesNet Voice unit back in.
4. After waiting a couple of minutes, check your phone to see if it's now working.
It's been a while since we last heard from you, so we will close this thread. If you still have concerns, please start a new thread and include a detailed explanation so we can better assist you.