Before using ISDN BRI, you must define
the ISDN switch-type global
command to specify the CO switch to which the router connects. The
Cisco IOS command output shown in the figure helps illustrate
the supported BRI switch types (in North America, the most common
types are 5ESS, DMS100, and NI-1). To configure a CO switch on the
ISDN interface, use the isdn
switch-type command in global
configuration command mode. The full syntax of the command is:
isdn switch-type switch-type
The argument switch-type
indicates the service provider switch type. switch-type
defaults to none, which disables the switch on the ISDN interface. To disable the
switch on the ISDN interface, specify isdn
switch-type none.
The following example configures the
AT&T 5ESS switch type:
isdn switch-type basic-5ess
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