To use the Interface, communication must be established between a
Ramtel microprocessor based telephone and another telephone.
This can be accomplished by calling the Ramtel phone or by
pushing the emergency button. Once
communications has been established, the called party enters a password
number on their telephone keypad; this will now allow access to the six
controls. The six outputs are controlled by pressing the 1 thru 6 buttons on
the called party's telephone keypad.