A method performed by, and a system embedded within, a communication device operating in a communication network, performing the steps of: obtaining a plurality of caller identification codes for the caller device, where each of the caller identification codes identifies the caller device in a network; obtaining at least one rule for selecting a caller identification code from the plurality of caller identification codes according to a characteristic of the called device; obtaining a characteristic of the called device; selecting a caller identification code from the plurality of caller identification codes according to the characteristic of the destination telephone identification, or caller environment or destination environment parameters, or caller decision on the time of making the call; and forwarding the selected caller identification code to any of another communication network and a terminal device of a communication network.