Finally, even if your software is set up properly, the settings may not work all the times. The initialization string described here is for the ATI modem only. Refer to your modem manual for the equivalent initialization string for your modem. Qmodem initializes the modem and also configures itself to use hardware flow control. HyperAccess 5 also initializes the modem properly, however it does not configure itself to use hardware flow control.
All modems come with default settings pre-configured from the factory.
Many V.32 high-speed modems are preset to use V.42bis and hardware flow control when they are turned on. Interestingly enough, not all high-speed modems are configured this way. There is another change required. CD is a signal generated by the modem which is used to indicate its connection status. DTR is a signal generated by your computer.