05-15-2012 06:58 AM - edited 03-16-2019 11:10 AM
We have recently installed a UC540 system with two BRI connections to the ISDN.
Incoming and outgoing calls are fine however when a call is received the phone displays 'Unknown number' and 'From: <blank>' regardless of the caller. Even numbers within the local directory show up like this. Any assistance with this would be appreciated!
Thanks Jim
05-15-2012 07:18 AM
As mentioned in so many other posts on the very same subject.
Take "debug isdn q931" with "term mon"
If no calling number is present, complain to telco.
08-28-2015 11:16 AM
Hello every one!
I got the same problem; but I can't execute the debug what Paolo says. My router are running Version 15.0(1)M1 of IOS, and there's imposible introduce it. I tried with many options and searched with "?":
Rotuer#
Rotuer#debug isdn q931
^
% Invalid input detected at '^' marker.
Rotuer#
Paolo, can you post here the links about your other posts. Please :) .
08-28-2015 11:22 AM
Hi,
Can you share the output of debug voice ccapi
08-29-2015 11:18 AM
Jim,
Please share "show run" and "show version" from router.
~Avinash
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