A system and method for voice communication between sender users and recipient users, and the sender users and external network entities is provided. The system includes a plurality of voice communication domains interacting with each other and with network entities, and a cross-domain coordinator configured to coordinate interaction between the voice communication domains over Internet. Each voice communication domain includes a plurality of personal communication devices (PCDs) associated with the corresponding users, and a voice communication server deployed within the voice communication domain to control operation of the PCDs. Each PCD is controlled and operated by voice user commands provided verbally, and is configured to provide voice communication between a sender user and a recipient user within the same voice communication domain, between the users of different voice communication domains, and between the sender user and the external network entities.