If you have a VOIP service like T-Mobile it might not work. If you can't fax on the line, the receiver can't phone home, and you'll need to hook up to internet or pay $5/month.
T-Mobile isn't on the line, they provide the home phone line, like Qwest, Vonage, etc.
Maybe it's a bad phone cord. Have you swapped them out?
Did it work before, and stopped working, or has never worked?
You have no voice phone on the line as well? Do you have to dial anything special to get out?Yes, it has worked before and I have changed the cord.
Again, there is a nothing on the line. I don't use Vonage, Qwest or anything, just a plain old land phone line connected directly to ATT. I don't understand how the caller id can still work if the system shows no phone connection.