Abstract: A computer-implemented method for establishing a communications link between a source and a target comprises: a) receiving, at a server, data identifying the source and the target; b) for each of the source and the target, retrieving a respective communication profile identifying one or more communications systems by which the respective one of the source or target may be communicated with; c) comparing the profiles to identify one or more common communications systems; and d) opening a communications link between the source and the target using one or more of the common communication systems.