Analytics on returned missed calls and voicemails

it would be useful to be able to analyze which missed calls and voicemails have been returned. We are operating medical practice and our goal is to return all voicemails ASAP. Currently we are exporting all the calls in the Excel and then through some number crunching finding out which voicemails and missed controls have not been returned. If such analytics feature exists, it would save lots of time to do Excel work.