An engineer troubleshoots an outbound call failure on an ISDN-PRI circuit. The engineer is suspecting the error “Incompatible Destination”. Which debugs or commands are run in the voice gateway to troubleshoot the issue?
An engineer troubleshoots an outbound call failure on an ISDN-PRI circuit. The engineer is suspecting the error “Incompatible Destination”. Which debugs or commands are run in the voice gateway to troubleshoot the issue?
The correct commands to troubleshoot an 'Incompatible Destination' error on an ISDN-PRI circuit are 'debug isdn q931' and 'show isdn status'. The 'debug isdn q931' command provides detailed ISDN Layer 3 messages, which include information about the call setup and teardown process, where 'Incompatible Destination' error messages would be displayed. The 'show isdn status' command provides the current status of the ISDN Layer 2 and Layer 3 protocols, helping diagnose and verify the operational status of the ISDN circuit.
C is correct, there is no "Incompatible destination" error message in q921 https://www.cisco.com/c/en/us/support/docs/dial-access/integrated-services-digital-networks-isdn-channel-associated-signaling-cas/8607-isdn-disc-code.html
On3 is right "incompatible destination" is an error a "Disconnect Cause Code" from debug isdn q931. Answer is C
Using the debug voip ccapi inout command you get the following Call informations in detail, like Calling Number, Called Number, Incoming Dial-peer, Outgoing Dial-peer, Trunk group lables, ANI (A Number CLI), ANI type and also the CAUSE VALUE. This Cause Value well help you to identify the reason for call drop So it is A. ccapi will help to understand error
I agree with (On3), there is no "Incompatible destination" error message in q921
C Will show disconnect reason due to incompatibility