A data-communications (e.g. VoIP-type) server is configured to provide data-communications services such as VoIP services to a plurality of endpoint devices. The server receives, from applications running on the endpoint devices, location updates identifying geographic locations of the endpoint devices. The server may modify a location database to include entries specifying the geographic locations of the endpoint devices. Data/telephone calls are routed based upon the entries specifying geographic locations of the plurality of endpoint devices. Based upon input parameters, a set of periodic update timings are generated and sent to the endpoint devices.