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Dialer Rotary Group Overview

Dialer rotary groups are designed to simplify configuration for multiple callers and multiple-destination environments by binding a single configuration to multiple physical interfaces. Synchronous, asynchronous, ISDN BRI, and ISDN PRI interfaces can make up a dialer rotary group. A physical interface that is configured as a member of a rotary group assumes configuration parameters for the group. A rotary group consisting of multiple physical interfaces applies the configuration of a logical dialer interface, also called a virtual dialer interface, to all its members.

When rotary groups are used, such characteristics as the IP address, interesting traffic definition, and call parameters are connected with the dialer interface rather than the physical interface. When a call comes into the router, the dialer interface selects a physical interface from the pool of physical interfaces.

With rotary groups, users of several BRIs or PRIs might get a single phone number from the service provider. Therefore, they allocate all their interfaces to a single rotary group so that only one number needs to be dialed. This kind of setup requires the remote routers to have only one set of dialer map statements for your destination. In turn, debugging and management on the user side are less complicated.

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