commands can be used to verify that the ISDN configuration has been implemented correctly.

To confirm BRI operations, use the show isdn status command to inspect the status of the BRI interfaces. This command can be used after configuring the ISDN BRI to verify that the TE1, or router, is communicating correctly with the ISDN switch. In the Figure output, the TEIs have been successfully negotiated and ISDN Layer 3 is ready to make or receive calls.

Verify that Layer 1 Status is ACTIVE, and that the Layer 2 Status state MULTIPLE_FRAME_ESTABLISHED appears. This command also displays the number of active calls.

The show isdn active command displays current call information, including all of the following:

• Called number
• Time until the call is disconnected
• Advice of charge (AOC)
• Charging units used during the call
• Whether the AOC information is provided during calls or at end of calls

The show dialer command displays information about the dialer interface:

• Current call status
• Dialup timer values
• Dial reason
• Remote device that is connected

The show interface bri0/0 displays statistics for the BRI interface configured on the router. Channel specific information is displayed by putting the channel number at the end of the command. In this case, the show interface bri0/0:1 command shows the following:

• The B channel is using PPP encapsulation.
• LCP has negotiated and is open.
• There are two NCPs running, IPCP and Cisco Discovery Protocol Control Protocol (CDPCP).