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Asuming you are using CUCM, you can pull the CDRs by going to Unified Serviceability > Tools >
CDR Analysis and Reporting > CDR. Export the CDRs to a CSV file and search calls to 911. You will find the Mac the call was made from.
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Cisco Serviceability Reporter is not running but now I know how. Thank you!
You need to make sure CDR is enabled on each subscriber. I also recommend enabling zero length CDR recording. This insures records are generated for calls where users hang up quickly.