CHAT SYSTEM, KEY TELEPHONE UNIT, AND RECORDING MEDIUM

摘要

A chat system includes a key telephone unit and a plurality of user terminals connected to the key telephone unit. When the key telephone unit receives presence information including an IP address of the user terminal, it refers to a list in a list table, selects the received IP address in presence information, and transmits the presence information including the IP address to a recipient included in the list. Thus, the key telephone unit establishes peer-to-peer chat communication between the user terminal that has transmitted the IP address and the recipient. When the user terminal which is continuing a chat moves to a different user terminal, the chat is being continued by transmitting presence information including an IP address of the different user terminal to the key telephone unit and chat data are transferred between the user terminal and the different user terminal in a peer-to-peer connection.

主权项

1. A chat system comprising:
a plurality of user terminals assigned with IP addresses, respectively; and a key telephone unit accommodating the plurality of the user terminals;wherein:
the key telephone unit is configured to:
receive presence information from a first user terminal in the plurality of the user terminals, the presence information including the IP address assigned to the first user terminal;refer to a list within a list table to pick up a second user terminal included in the list;transmit the presence information including the IP address received from the first user terminal to the second user terminal; andmake the first and the second user terminals perform a chat communication in a peer-to-peer connection;wherein;
when a user of the first user terminal moves from the first user terminal to a third user terminal, the third user terminal
transmits, to the key telephone unit, presence information of the user which includes an IP address of the third user terminal and the key telephone unit
refers to the list within the list table andtransmits, to the second user terminal included in the list, the presence information including the received IP address of the third user terminal;wherein:
chat data between the first user terminal and the second user terminal
are transferred from the first user terminal to the third user terminal in a peer-to-peer connection andare taken over as chat data between the third user terminal and the second user terminal, and the peer-to-peer chat communication between the first and the second user terminals is continued as a peer-to-peer chat communication between the third and the second user terminals.