Dialer profiles remove the configuration from the interface receiving or making calls and only bind the configuration to the interface on a per-call basis. Dialer profiles allow physical interfaces to dynamically take on different characteristics based on incoming or outgoing call requirements. Dialer profiles can do all of the following:

• Define encapsulation and access control lists
• Determine minimum or maximum calls
• Turn features on or off

Dialer profiles aid in the design and deployment of more complex and scalable circuit-switched internetworks by implementing a more scalable DDR model in Cisco routers and access servers. Dialer profiles separate the logical portion of DDR, such as the network layer, encapsulation, and dialer parameters, from the physical interface that places or receives calls.

Using dialer profiles, the following tasks may be performed:

• Configure B channels of an ISDN interface with different IP subnets.
• Use different encapsulations on the B channels of an ISDN interface.
• Set different DDR parameters for the B channels of an ISDN interface.
• Eliminate the waste of ISDN B channels by letting ISDN BRIs belong to multiple dialer pools.

A dialer profile consists of the following elements:

• Dialer interface – A logical entity that uses a per-destination dialer profile.
• Dialer pool – Each dialer interface references a dialer pool, which is a group of one or more physical interfaces associated with a dialer profile.
• Physical interfaces – Interfaces in a dialer pool are configured for encapsulation parameters and to identify the dialer pools to which the interface belongs. PPP authentication, encapsulation type, and multilink PPP are all configured on the physical interface.

Like legacy DDR, dialer profiles activate when interesting traffic is queued to be sent out a DDR interface. First, an interesting packet is routed to a remote DDR IP address. The router then checks the configured dialer interfaces for one that shares the same subnet as the remote DDR IP address. If one exists, the router looks for an unused physical DDR interface in the dialer pool. The configuration from the dialer profile is then applied to the interface and the router attempts to create the DDR connection. When the connection is terminated, the interface is returned to the dialer pool for the next call.

Web Links Dialer Profiles http://www.cisco.com/en/US/tech/ tk801/tk133/tk159/ tech_protocol_home.html