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Справка Windows

To enable operator-assisted calls or manual dialing:

Open Network Connections.
On the Advanced menu, click Operator-Assisted Dialing.
Double-click the connection you want to dial.
Pick up the telephone handset, and then dial the number or ask the operator to dial it for you.
The number assigned to the entry is displayed in the dialog box for easy reference.

Immediately after you have finished dialing, click Dial.
Hang up the handset only after the modem takes control of the line, which is typically signaled with a click followed by silence.
It is always safe to replace the handset once Network Connections begins verifying your user name and password. The status message will remind you of this.