A modem initialization string is a series of commands that instruct a modem to perform certain tasks, for example dial or hang up.
Initialization strings help configure modems for optimum performance.
Here is an example of a Hayes compatible modem string. If your modem's initialization string is incorrect or incompatible with the modem you are calling, you may experience problems like dropped connections or even an inability to connect. To check your modem's initialization string, you'll need to determine your modem type. Windows should display a Modems Properties dialog box with your modem listed. If the modem doesn't appear in this dialog box, your computer doesn't recognize it yet.