|  | 5.5 | ISDN Configuration Tasks
| 5.5.1 | ISDN global and interface parameter configuration tasks

You must specify global and interface parameters to prepare the router for operation in an ISDN environment. Global parameter tasks include the following: Select the switch that matches the ISDN provider's switch at the CO. This requirement is necessary because, despite standards, signaling specifics differ regionally and nationally. Set destination details. This involves indicating static routes from the router to other ISDN destinations and establishing the criteria for interesting packets in the router that initiate an ISDN call to the appropriate destination. Interface parameter tasks include the following: Select interface specifications. Specify the interface type BRI and the number for this ISDN BRI port. The interface uses an IP address and subnet mask. Configure ISDN addressing with DDR dialer information and any ID supplied by the ISDN service provider. Indicate that the interface is part of the dialer group, using the interesting packets set globally. Additional commands place the ISDN call to the appropriate destination. Following interface configuration, you can define optional features, including time to wait for the ISDN carrier to respond to the call and seconds of idle time before the router times out and drops the call. Next, BRI configuration involves configuration of ISDN, switch type, and ISDN SPIDs. The following section provides examples and descriptions of ISDN configuration tasks.
| Engineering Journal
| ISDN Commands