A communication terminal, a method of communication, and a computer-readable non-transitory recording medium storing a program for causing a computer to execute the method. The communication terminal and the method includes outputting terminal identification information identifying a communication terminal, receiving external terminal identification information identifying an external communication terminal, the external terminal identification information being sent from the external communication terminal through a communication management system to a destination address of the communication terminal indicated by the terminal identification information, and transmitting, when requesting to start communication with a counterpart communication terminal, the received external terminal identification information to the communication management system, instead of the terminal identification information of the communication terminal.