To configure an installed modem
You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure.
Open Phone and Modem Options in Control Panel.
On the Modems tab, click the modem you want to configure, and then click Properties.
Make any of the following changes:
Change the speaker volume, maximum port speed, or wait for a dial tone before dialing.
Click the Modem tab.
View diagnostic information, including commands supported by your modem, or view a log of modem activity.
Click the Diagnostics tab.
Add extra initialization commands.
Click the Advanced tab.
Change call preferences (manual dialing or disconnecting) or data connection preferences (port speed, data protocol, compression, or flow control).
Click the Advanced tab, and then click Change Default Preferences.
Change hardware settings (data bits, parity, stop bits, or modulation).
Click the Advanced tab, click Change Default Preferences, and then click the Advanced tab.
To open Phone and Modem Options, click Start, click Control Panel, and then click Network and Internet Connections. Under See Also, click Phone and Modem Options.