# ISP Configuration

On some devices, you can configure a dial back-up interface to the Untrust zone. You can connect an external modem to the RS-232 serial port to allow the device to have a dial-up backup interface to the Untrust zone. The serial interface is used if there is a failure on the connection through the primary, Ethernet interface to the Untrust zone.

You configure the device to automatically dial to an Internet Service Provider (ISP) account when failover to the serial interface occurs. You can configure up to four ISP connections.

### To Configure an ISP

1. On the Interface (ISP) page, enter the necessary information:

ISP Name: Enter a name that identifies the ISP.

Primary Number: Enter the primary phone number to access the ISP. If your modem uses tone dial by default, but you want to use pulse dial, precede the phone number with a P. If your modem uses pulse dial by default, but you want to use tone dial, precede the phone number with a T.

Alternative Number: Enter the alternative phone number to access the ISP.

Login Name: Enter the user login for the ISP account.

Login Password: Enter the user password for the ISP account.

Priority: Enter the priority of this ISP, relative to other ISPs that may be configured. A value of 1 is the highest priority. The priority number determines the order that ScreenOS uses in attempting the dial-up connection; ScreenOS dials up the ISP with the highest priority first.

2. Click OK to save the settings. Click Apply to continue the ISP configuration.

## ISP List

On the Interface (ISP) page, you can see all configured ISPs. The table contains the following information:

ISP: Indicates a name that identifies the ISP.

Primary: Indicates the primary phone number used to access the ISP.

Alternative: Indicates the alternate phone number used to access the ISP.

Login: Indicates the user login for the ISP account.

Priority: Indicates the priority of this ISP, relative to other configured ISPs. A value of 1 is the highest priority. The priority number determines the order that ScreenOS uses in attempting the dial-up connection. A value of 1 is the highest priority; ScreenOS dials up the ISP with the highest priority first.

Configure: Click Edit to modify the ISP configuration, or click Remove to delete it. Click Test to test the ISP configuration (you need to have a modem connected and configured).