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Knowledge Base

A settlement of the conference offline in ISDN video conference

Publication Date:  2012-09-22  |   Views:  160  |   Downloads:  0  |   Author:  SU1001522602  |   Document ID:  EKB1000015837


Issue Description

When we convene ISDN and E1 conference at the same time, the ISDN site will be offline and can not enter again, but the E1 is OK.

Alarm Information


Handling Process

These ISDN conference sites were all OK before, it may not be the terminal fault that induced a lot of sites offline, it must be the fault of MCU or switch. As the E1 sites are OK, so it is not the transmission problem; examined the connection of PRI from E16 on MCU side to DDF and it is OK; At last, the CPU1 debugger on the MCU operation bench constantly receive the second level message from the switch, so it may be the problem of switch’s LAP board, reset it but the fault stay still, so it must be LAP board fault, replace it and then the fault is settled.

Root Cause

The second level protocol process board of the switch had a fault, the restarting can not settle, the board must be replaced.