if you enabled the log calls with zero duration you should see them look at this:
Cause 2
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a008056bd4e.shtml#cause2
Note: Sometimes, the zero and minimum duration calls to 911 do not show up in the CDR database if the calls are hung up quickly (as if 911 was dialed mistakenly). This issue can happen when the CDR parameter called Log calls with zero duration is set to False. Unless this parameter is enabled, the server does not log calls with zero duration in the CDR database. This includes calls that are never connected. In this situation, go to the CallManager Service Parameters and make sure that the Log calls with zero duration flag is set to True.
HTH
HTH
java
if this helps, please rate