Communication terminal, communication system, communication method, and recording medium

A communication system, comprising:

• a first communication terminal including;
• a memory to store first terminal identification information identifying the first communication terminal;
• first circuitry to provide the first terminal identification information read out from the memory to a mobile terminal,
• a second communication terminal including:
• second circuitry to obtain the first terminal identification information from the mobile terminal;
• and
• a transmitter to transmit a request for starting communication with the first communication terminal to establish a communication session with the first communication terminal, and
• a memory to store, for each one of one or more candidate counterpart communication terminals capable of communicating with the first communication terminal, terminal identification information identifying a respective communication terminal, the terminal identification information being received from a communication management system different than the mobile terminal,
• wherein the first circuitry further determines whether the first terminal identification information matches any one of the terminal identification information stored in the memory,
• wherein, based on a determination indicating that the first terminal identification information matches the terminal identification information stored in the memory, the transmitter starts communicating with the first communication terminal, and
• wherein, based on a determination indicating that the first terminal identification information does not match the terminal identification information stored in the memory, the transmitter transmits a request for adding the first communication terminal as a candidate counterpart communication terminal for the second communication terminal.

A method of communicating, comprising:

• receiving, from a mobile terminal, first terminal identification information for identifying a first communication terminal that is located remotely from the communication terminal, the mobile terminal being a mobile terminal that has obtained the first terminal identification information from the first communication terminal;
• determining the first communication terminal identified with the first terminal identification information as a communication destination;
• and
• starting communicating with the first communication terminal,
• wherein the determining further determines whether the first terminal identification information matches any one of the terminal identification information stored in a memory which stores, for each one of one or more candidate counterpart communication terminals capable of communicating with the communication terminal, terminal identification information identifying a respective communication terminal, the terminal identification information being received from a communication management system different than the mobile terminal,
• wherein, based on a determination indicating that the first terminal identification information matches the terminal identification information stored in the memory, the starting communicating starts communicating with the first communication terminal, and
• wherein, based on a determination indicating that the first terminal identification information does not match the terminal identification information stored in the memory, the starting communicating communicates a request for adding the first communication terminal as a candidate counterpart communication terminal for the communication terminal.