HPE FlexNetwork MSR series Configuration Manual page 175

The physical interface can have one or more call destinations.
This method applies when only one interface places or receives calls.
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Configure DDR parameters on a dialer interface.
A dialer interface is associated with a group of physical interfaces and selects a physical
interface to place or receive calls.
A dialer interface can have one or more call destinations. A dialer interface with multiple call
destinations can use any associated physical interface to place calls to any of the call
destinations.
A physical interface can belong to only one dialer interface.
This method applies when one or more interfaces place or receive calls.
Bundle DDR
When using bundle DDR, you can configure DDR parameters only on a dialer interface.
A dialer interface corresponds to a dialer bundle. A dialer bundle can contain multiple physical
interfaces. You can assign a priority to each physical interface in the dialer bundle. Each time a call is
placed, the highest-priority physical interface available is selected. If multiple physical interfaces with
the highest priority are available, these interfaces are selected in a round-robin manner.
A dialer interface can have only one call destination.
A physical interface can belong to multiple dialer bundles and can be used by multiple dialer
interfaces at different times.
Comparison of traditional DDR and bundle DDR
Traditional DDR is based on one-to-one bindings between dial services and physical interfaces. A
new dial service requires a new physical interface. As a result, traditional DDR has poor extensibility.
NOTE:
A dial rule (configured by using the dialer-group rule command) defines one dial service.
Figure 53 Relationships among physical interfaces, dialer interfaces, and call destinations in
traditional DDR
Dialer circular
group 1
Dialer circular
group 2
Bundle DDR is simpler and more flexible than traditional DDR. Bundle DDR separates physical
interface configuration and logical configuration for calls and allows one-to-many bindings between
dial services and physical interfaces. A physical interface can serve multiple dial services.
Physical interface
Ser2/1/0
Bri2/4/0
Ser2/1/1
Bri2/4/1
Ser2/1/2
Asy2/5/0
Dialer interface
Dialer 1
Dialer 2
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Call destination A
Call destination B
Call destination C