Configuring ISDN BRI: Setting the Switch Type

Router(config)#isdn switch-type switch-type	Sets the switch type globally for all ISDN interfaces
Router(config)#int bri 0
Router(config-ifg)#isdn switch-type switch-type	Sets the switch type for this specific interface. Can be different from global switch type if necessary

Note:

The switch type will be given to you from your service provider.

A main office with 30 branch offices might have 28 offices using one switch type and two offices using a different switch type. Thus, you would use the global-level command to set the switch type to the one required by the 28 offices, and the interface-level command to override this on the two interfaces that needed a different switch type.