ISDN call failure

Answered Question
Aug 21st, 2008
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What are the ways to troubleshoot if inbound calls fail on the PRI / BRI interface? what possible debugs can help? ( sh isdn status)

Correct Answer by Ayodeji Okanlawon about 8 years 10 months ago

Every engineer's dream debug is


debug isdn q931.


Two keys things you need to observe are


1. Cause code


2. Direction of disconnection.


With the cause codes you will be able to know the reason why the call was disconnected.


The directin of the disconnection will tell you which party initiated disconnect, this will help you know if the problem is coming from your gateway or the Telco.

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Correct Answer
Ayodeji Okanlawon Thu, 08/21/2008 - 00:46
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  • Super Bronze, 10000 points or more
  • Cisco Designated VIP,

    2017 IP Telephony

Every engineer's dream debug is


debug isdn q931.


Two keys things you need to observe are


1. Cause code


2. Direction of disconnection.


With the cause codes you will be able to know the reason why the call was disconnected.


The directin of the disconnection will tell you which party initiated disconnect, this will help you know if the problem is coming from your gateway or the Telco.

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