How can I disable the modem speaker when dialing?

Double click 'My Computer'

Double click "Dial-Up Networking'

Select the Dial-up connection, click More and select 'Edit entry and modemproperties'

Select the Basic tab and at the bottom next to 'Dial using:' clickConfigure

At the bottom of the Modem Configuration dialog is a 'Disable modemspeaker' check box, check it and click OK

Click OK to the main dialog and close all other dialogs

Start the Modem control panel applet (Start - Settings - Modems)

Select the modem and click Properties

Select the Connection tab

Click the Advanced button and the bottom of the dialog

In the 'Extra settings' box enter the command string to disable thespeaker, e.g.
M0

Click OK to the dialogs