Thank you for posting and welcome to the community. I am sorry to hear this. I am going to need a few pieces of information before we can start troubleshooting.
1. Do you have our HughesNet Voice service (VOIP)?
2. When you mention your house phone is connected, are referencing a third-party house phone connected to the modem/network?
3. What number did you try to call back and was this the number that called you on your house phone originally? Are you trying to use Wi-Fi calling?
4. When did this problem start?