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Cisco Bug: CSCtd25377 - MGCP/ISDN loss of service and repeatively sends ISDN setup

Last Modified

Feb 22, 2014

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

Controller 0/1/1 sends the same ISDN setup without receive any backhaul / MGCP message from CUCM. Basically, the gateway sends the setup without CUCM's control. However, the CUCM backhaul should work as calls via other controllers works fine. 

It seems the gateway repeat sending the setup for same call without controller of CUCM. Those ISDN setup message has the following similarity:

-          Same calling party number
-          Same called party number
-          Same call reference value
-          Always the Same Channel
-          Gateway always send "RELEASE_COMP pd = 8  callref = 0x808F" - incorrect reference value immediately  after the setup 

Normal Condition with IOS 12.4.7b
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