Message Only Extension Report

We have 15 message only extensions setup as efaxes and am trying to generate a report that lists each one of the efax extensions and gives a total for each for a specified date range. I've tried utilizing the call log but it only allows me to select one extension at a time which is quite time consuming since this will be run on a weekly basis. I've also looked under the analytics reports but am not seeing any criteria for message only extensions. Am I missing something? Is there a better way of doing this?