I have an Ernest payphone and I am looking for the software and manuals to program it. How can I tell which model it is? I can not find a model on it anywhere. It is touchtone with no display. It works fine except it answers with the modem when someone calls the house after 3 rings. I would like to change that so that my answering machine picks up before the payphone does. Can anyone help with manuals and programming instructions?