COURIER HIGH SPEED MODEMS
%T  | Enables the modem, when off hook, to detect the tone | 
  | frequencies of dialing modems. %T is meant primarily for use  | 
  | with network applications, but may also be integrated into  | 
  | certain software programs. For example, %T could be used in a  | 
  | security program to identify incoming tone security codes.  | 
To enable %T, type ATH1 <Enter> to force the modem off hook. Then type AT%T <Enter>.
To return the modem to Command mode, press any key or drop the computer's or terminal's DTR signal. The modem responds OK.
%V=PWn Assign the password in account n in your Courier modem’s security as your autopass password. See Appendix D.