Old / incompatible firmware being used.
Recommend upgrading to the latest UC500 software pack. https://supportforums.cisco.com/docs/DOC-9829
CCA Upgrade Failing
Go through the CCA connection checklist - https://supportforums.cisco.com/docs/DOC-9779
Incompatibility of configs with CCA.
Recommend doing most of the configuration via CCA & tweaking via command line if required.
If you would like to use command line please start with the latest CCA templates to ensure compatability for future upgrades etc.
No or incorrect IP connectivity. L2 or L3 Issues.
Troubleshoot connectivity.
ISDN Configuration
Typically need to tweak the ISDN parameters to ensure compatibility with your Telco.
FXO Configuration
Typically its to do with supervisory disconnect or CP tone.
Wireless issues
Make sure you have world mode enabled for the 7921G to work in Australia (Other countries ?)
Under wireless interface > World-mode dot11d country au both
Dial plan / call flow issues
Variety of things. The key is to isolate the specific dial-peer & voice port that is creating the issues.
Voice Troubleshooting Overview
Always apply good troubleshooting methodology. You must isolate the issue before you attempt to fix it.
http://docwiki.cisco.com/wiki/Cisco_Unified_Communications_--_System_Troubleshooting_Methodology
http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_Guide
IP Connectivity Troubleshooting
Recommended Command
>show ip route
>ping
>Show cdp neighbour
>Show cdp neighbour detail
ISDN Troubleshooting
Recommended Commands
>Show isdn status
>Debug isdn q921
>Debug isdn q931
http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800a754a.shtml
http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_--_T1_or_E1_Interface_Troubleshooting
http://www.cisco.com/en/US/docs/ios/12_2/voice/configuration/guide/vvfisdn.html
FXO Troubleshooting
Recommend commands
>show voice port
>show voice call summary
>debug vpm all
http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_--_FXO_Interfaces
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800ae2d1.shtml
Call flow Issues
Recommend commands
> show dialplan number <phone number to test>
> debug voip dialpeer
> debug ccsip all (SIP including CUE issues)
>debug voip ccapi inout (VOIP issues)
http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_--_Call_Flow_Overview
http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_--_Call_Flow_Overview
