We have US and EU support teams that would greatly benefit of some sort of sync of Active Directory information and their mobile phone book. It became quickly apparent the features in the Meraki documentation were for VoIP phones.
Depending on the resources you have available the best solution would be a new App built Cross platform. I am sure someone might have already solved this problem though. But if you want quick some quick Agile tool you can build yourself then "Google Firebase" might be a good start.