Communication system, terminal, communication method and communication program for terminals while communicating with each other to identify the opposite party

A communication system comprising:

• a terminal which has functionality to make a voice call through user operation and to execute an application;
• a terminal for use by a user as an opposite party;
• circuit switching equipment which performs voice call control for terminals to make a voice call therebetween;
• and
• a relay server which relays communications between applications on terminals,
• wherein each of the terminals includes:
• a hardware processor;
• a voice call unit, implemented by the hardware processor, which controls a voice call between users;
• a voice call information linkage unit, implemented by the hardware processor, which acquires information indicative of voice call status from the voice call unit and stores the voice call status in a voice call information storage unit, and which includes a voice call information transmission unit which stores a voice call status change notice upon detecting a voice call start event, which transmits the voice call status change notice to the relay server when ordered by a voice call linkage application, and which transmits information indicative of the voice call status to the relay server;
• and
• an own ID storage unit which stores a terminal identifier for identifying the terminal on which the voice call linkage application runs, the voice call linkage application communicating with the application on the terminal of the opposite party via the relay server,
• wherein the relay server includes:
• a voice call status reception unit which receives the voice call status change notice giving notification of a change in the voice call status of a terminal;
• a voice call status storage unit which stores information indicative of the voice call status of each of the terminals;
• and
• an inter-application communication unit which communicates with the voice call linkage application running on the terminals so as to relay communications between the applications,
• wherein, upon detecting a voice call end event, the voice call status change notice including a call end notification is transmitted to the relay server and the voice call status change notice in the voice call information storage unit is deleted.

A terminal comprising:

• a hardware processor;
• a voice call unit, implemented by the hardware processor, which controls a voice call between users;
• a voice call information linkage unit, implemented by the hardware processor, which acquires information indicative of voice call status from the voice call unit and stores the voice call status in a voice call information storage unit, and includes a voice call information transmission unit which stores a voice call status change notice upon detecting a voice call start event, which transmits the voice call status change notice to a relay server when ordered by a voice call linkage application, and which transmits the information indicative of the voice call status to the relay server;
• and
• an own ID storage unit which stores a terminal identifier for identifying the terminal on which the voice call linkage application runs, the voice call linkage application communicating with an application on the terminal of an opposite party via the relay server,
• wherein, upon detecting a voice call end event, the voice call status change notice including a call end notification is transmitted to the relay server and the voice call status change notice in the voice call information storage unit is deleted.

A communication method comprising:

• when a voice call process is performed, causing a terminal to transmit to a relay server a voice call status change notice inclusive of information for identifying the terminal and indicative of voice call status having been changed, through communication using an application,
• upon receipt of communication data through communication using the application from a communication source terminal, causing the relay server to identify a communication destination terminal based on the voice call status change notice and to transmit the communication data to the identified communication destination terminal,
• the voice call status having been changed is stored in a voice call information storage unit,
• the voice call status change notice is stored in a voice call information transmission unit upon detecting a voice call start event in the voice call information storage unit, and the voice call status change notice is transmitted to the relay server when ordered by a voice call linkage application, and
• upon detecting a voice call end event, the voice call information transmission unit transmits the voice call status change notice including a call end notification to the relay server and deletes the voice call status change notice in the voice call information storage unit.

A non-transitory computer readable information recording medium storing a communication program that, when executed by a processor, performs a method for:

• when a voice call process is performed, transmitting to a relay server a voice call status change notice inclusive of information for identifying terminals and indicative of voice call status having been changed, through communication using an application,
• the voice call status having been changed is stored in a voice call information storage unit,
• the voice call status change notice is stored in a voice call information transmission unit upon detecting a voice call start event in the voice call information storage unit, and the voice call status change notice is transmitted to the relay server when ordered by a voice call linkage application, and
• upon detecting a voice call end event, the voice call information transmission unit transmits the voice call status change notice including a call end notification to the relay server and deletes the voice call status change notice in the voice call information storage unit.