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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

dialer caller — interface

Synopsis

dialer caller number [callback]
no dialer caller number [callback]

Configures

Caller ID screening

Default

Disabled

Description

This command configures a dialer interface to reject calls that do not match the given number. The number can be any phone number; the character x can be used as a wildcard. The callback keyword enables Caller ID callback; in this case, the incoming call is refused, and the router initiates a call to the Caller ID number. This may help you to manage your telephone charges. This feature is available only on certain routers with special dialer interfaces. A switch that supports Caller ID is also required for this operation. If you enable this feature and do not have the required hardware for Caller ID, all calls are denied.

Example

The following command allows any number from 4,105,554,290 through 4,105,554,299:

dialer caller 410555429x

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