This number calls every morning and today on Sunday. No response when I answer and if I call back it's a modem sound.

Yes, this number call regularly, and no one there when you answer. When you call back it a fax machine.

This call originates from the prison in Berks County, PA. So if you try and call it back, you will hear a tone, which means it is for outgoing calls only and does not accept incoming calls.

keeps calling me

it kept calling me also noone would say anything nor would anyone pick up but i guess it was my phone cause it finally picked up its definiy berks county prison yall must no someone locked up they keep calling should look into it dont diss them