- Check that the ISDN service is connected: sh isdn status
- Check that calls are going through correctly:
debug isdn q931
term mon
If you do not see any debug messages, use the following command, if on a console session:
logging console debug
If on a telnet session, use
logging monitor debug
One way to check things is to issue the show log command. In the first group of lines displayed it should show the various logging destinations and how they are set (console logging, buffer logging, and trap logging). It should show what is enabled and what is disabled and what severity level is set for each.
For full instructions, visit the Cisco website: http://www.cisco.com/c/en/us/support/docs/dial-access/integrated-services-digital-networks-isdn-channel-associated-signaling-cas/9495-isdn-q931-ts.html
IT Support Blog 