Good morning oboe1960,
Welcome and thanks for posting. We can certainly help address your HughesNet Voice concerns. Please confirm that your ATA is set up properly with cables secured on each end; it should look like this:

If you don't already have this, this is the user guide for your Voice service:
http://voice.hughesnet.com/installguide/ Page ten is where it goes into detail about how where to plug everything in. It's very important that if you have a router, that the ATA is between the modem and the router. If the router is connected to the modem first, and the ATA is connected to the router, that can cause problems.
Then please ensure this is the power supply that's plugged into the ATA:

Then at the back of the ATA, make sure your phone is plugged into the PHONE 1 port. The HughesNet modem should be plugged into the INTERNET port. Finally, if applicable, your router should be plugged into the ETHERNET port.

If any connection feels loose, please let me know, that could be a cause of no dial tone.
After verifying your setup, please let me know which lights you see lit up on the ATA. Under normal conditions, all three lights should be solid green.
Your cooperation and patience are much appreciated and I look forward to hearing back from you.
Thanks,
Liz
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