Cisco 7945 Phones Ringing Tracking

I posted a very similar question recently. But on further investigation I need to ask again. I need to track when and for how long various Cisco phones ring. I thought I found this in the Call Detail Reporting.  BUT it turns out that this information is only available for calls that were picked up. The problem I am analyzing is trying to figure out why the phone is NOT being picked up. So I need ringing information to correlate with data from our call distribution system. I looked also at the call traces. But that only give me the SIP code for "ringing" and not more specific information as to when the phone started ringing and when it stopped. Any other thought about how I could track this? One thought I had was that for an individual I could add their line to my phone and I would be able to see whenever it rang. Kind of cumbersome but perhaps better than nothing. Any other thoughts??
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amigan_99Network EngineerAsked:
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José MéndezCommented:
My friend, the time difference between the 180 Ringing message and the next message is the time period the phone was in ringing state.

For example, if you see the 180 in the inbound direction, and the next message is a CANCEL out to the phone 12 seconds later, that means the phone rang 3 times and then Callmanager canceled the connection to the phone to proceed with VM or whatever.
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amigan_99Network EngineerAuthor Commented:
Excellent.  Thank you again.
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José MéndezCommented:
Friend, sometimes I feel you close the thread without having asked everything you want to ask. Please do elaborate on your inquiries as much as needed so I can help you clear all doubts =D
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amigan_99Network EngineerAuthor Commented:
Thanks again www.
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