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Dialer Interface

The dialer (dln) interface is a logical interface on which you configure dialing properties for ISDN connections. The interface can be configured in two modes:

Multilink mode using Multilink PPP encapsulation
Normal mode using PPP or Cisco High-Level Data Link Control (HDLC) encapsulation

The dialer interface can perform backup, dialer filter, and dialer watch functions, but these operations are mutually exclusive. You can configure a single dialer interface to operate in only one of the following ways:

As a backup interface—for one primary interface
As a dialer filter
As a dialer watch interface

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