Abstract: A network infrastructure operable to support the exchange of communications, such as voice communications, between a first client terminal having a first user identifier and a second (destination) client terminal associated with a second user identifier (handle). This second client terminal may be part of a family of client terminals. The network infrastructure includes a packet-switch network, a shared database and a number of client terminals serviced by one or more service providers. These terminals include a network interface and are identified by their service provider by a network address. The shared database associates user identifiers, metadata and network addresses. This allows a user to access the shared database in order to initiate a call request from the first client terminal to the second client terminal(s). The first client terminal receives the network address or vectoring information on the network address of the destination terminal through the shared database.