Abstract: Systems, processes, and computer readable media are described for dynamically routing calls over one of a plurality of possible networks to a client device. A process comprises determining, by a processor, at least one characteristic of a voice communication path to a client device across a plurality of different networks, where one network includes an Internet routing service and another network includes a mobile or cellular network service. The process further includes initiating voice communication between a telephony server and the client device via one of the at least two different networks based on the at least one characteristic. The process may further include accessing data preferences associated with the client device, where initiating the voice communications is further based on the data preferences associated with the client device.