ISDN - digitial phone system

• Notes on Cisco ISDN trouble shooting, mostly voice on BRI(2Ch) and PRI(31Ch)
• Alarm RAI

  • #sh controllers e1 0/3/0
     E1 0/3/0 is down.
      Applique type is Channelized E1 - balanced
      Description: Link to PSTN
      Receiver has remote alarm.
      ...

  • Indicates that the remote side (Provider) has a problem and is sending a alarm to the Cisco router interface.

  • #sh isdn status
    ISDN Serial0/3/0:15 interface
            dsl 0, interface ISDN Switchtype = primary-net5
            L2 Protocol = Q.921 0x0000  L3 Protocol(s) = CCM MANAGER 0x0003 
        Layer 1 Status:
            DEACTIVATED
        ...

...