Preview Tool

Cisco Bug: CSCte51183 - T1/E1 controller stays down even if alarm-trigger condition cleared

Last Modified

Jan 28, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.4(19.10) 12.4(19.10)T 12.4(24)T2 12.4(25b)M0.16 15.0(1)M1.6

Description (partial)

A T1/E1 controller configured for <CmdBold>alarm-trigger blue<noCmdBold> remains in a DOWN state
and transmits Blue Alarm (Alarm Indication Signal, or AIS) even when the trigger
condition for the Blue Alarm has cleared.  Proper function is that when the
trigger condition has cleared, the T1/E1 controller should automatically recover
itself into an UP state.

This behaviour will be observed on a Cisco Voice GateWay which has been
configured for "connection trunk", and which has been set for the "T1/E1 Alarm
Conditioning for Switched Calls and Permanent Connection Trunks" feature.  Even
when all voice-port busyout conditions have been cleared, the T1/E1 controllers
for these voice-ports will remain DOWN and continue to send AIS.

Known affected IOS versions are 12.4(19.10) and newer in the 12.4 mainline 
release train, 12.4(19.10)T and newer in the 12.4T release train, and all 
releases of 15.0M and 15.1T.  

Also see defect ID CSCte76068 "T1/E1 alarm-trigger blue command unconfigured 
when busyout occurs".
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.