| Commands | Description |
| show isdn physicalIf lapd | Displays the lapd's current status. |
| show isdn physicalIf basicRate | ISDN interface type, line topology, and signal mode for each ISDN link. |
| show isdn physicalIf bearer (B) Channel | B-channel information for each ISDN link. |
| show isdn physicalIf directory | Displays the Index, Number, Signaling Index, and status of the ISDN physical interface. |
| show isdn physicalIf endpoint | Terminal endpoint, service profile, and status for each ISDN link. |
| show isdn physicalIf baseLapd | Displays the lapd timer and window parameters. |
| show isdn physicalIf signalStatistics | Incoming and outgoing counters for each ISDN link. |
| show isdn physicalIf signalTable | Address and status information for each ISDN link. |