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Three main reasons for ISDN calls failing are going to be
Layer 1 Deactivated – Cable not plugged in or possibly a local telephone company line trouble.
Ensure the cable you are using is snuggly connected – you may want to try reseating the cord.
SPIDS showing as not valid
Need to have the local telephone company test the …
When working with Cisco it can be helpful or sometimes necessary to have a crash file to send to Cisco.
What is a crashfile?
The crashinfo file contains this information:
limited error message (log) and command history
description of the image running at the time of the crash show alignment
malloc and free traces
process level stack …
For new IMA installs, cell delineation can initially appear to be a telco issue. However, Cisco has identified a bug that can cause the ATM interfaces to drop and show cell delineation messages in the log. Regardless of the telco line status.
The fix for this is to upgrade to 12.4(20)T2 or higher. If …
Running into this error would suggest an equipment failure:Router1#sho ser ser0Interface Serial0Module type is T1/fractionalHardware revision is 1.5, Software revision is 20050811-0.3,Image checksum is 0×80ACD1B3, Protocol revision is 0.1Receiver has no alarms.Framing is ESF, Line Code is B8ZS, Current clock source is line,Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec.Last module …