Configuring an ISDN Interface to Screen Incoming Calls

By default, an ISDN interface is configured to accept all incoming calls. If multiple devices are connected to the same ISDN line, you can configure an ISDN interface to screen incoming calls based on the incoming called number.

You can configure the incoming called numbers that you want an ISDN interface to accept. You can also use the reject option to configure a called number that you want an ISDN interface to ignore because the number belongs to another device connected to the same ISDN line. For example, if another device on the same ISDN line has the called number 4085551091, you can configure the called number 4085551091 with the reject option on the ISDN interface so that it does not accept calls with that number.

When it receives an incoming ISDN call, the Services Router matches the incoming called number against the called numbers configured on its ISDN interfaces. If an exact match is not found, or if the called number is configured with the reject option, the incoming call is ignored. Each ISDN interface accepts only the calls whose called numbers are configured on it.

To configure an ISDN interface to screen incoming ISDN calls:

1. Navigate to the top of the configuration hierarchy in either the J-Web or CLI configuration editor.
2. Perform the configuration tasks described in Table 71.
3. If you are finished configuring the router, commit the configuration.
4. To verify that the network interface is configured correctly, see Verifying the ISDN Configuration.

Table 71: Configuring an ISDN Interface to Screen Incoming ISDN Calls