Jaton Communicator V.90 - Manual (Page 30)

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Otherwise, you will hear the dial tone from modem. Press “Esc” key on your
keyboard to cancel. You will be in command state.
You will be able to type in AT commands and control your modem directly.
This is a great way to check out if your modem is actually working or not.
Of course, this is not the way you usually use your modem. That is why we
provided you an award wining communication software to make your data
communication easier.
If you have encountered some difficulty using the modem, you may Click on
Properties on “Modem property” on Control Panel.