Control system, control method, and computer-readable recording medium

A control system comprising:

• a first control device connected to a first communication terminal to control a session for sending and receiving contents data;
• and
• a second control device connected to a second communication terminal to control a session for sending and receiving contents data, wherein
• the first control device includes
• a first destination information sender configured to send destination information indicating address of the first communication terminal in a communication network to a management device that manages the destination information;
• a first destination information receiver configured to receive destination information indicating address of the second communication terminal from the management device;
• a first inter-terminal information receiver configured to receive, from among inter-terminal information sent between the first communication terminal and the second communication terminal, the inter-terminal information sent by the first communication terminal, the inter-terminal information to be received including a start request for starting communication between the first communication terminal and the second communication terminal;
• and
• a first inter-terminal information sender configured to send, based on the destination information of the second communication terminal, the inter-terminal information indicating the start request to the second communication terminal, and
• the second control device includes
• a second destination information sender configured to send the destination information of the second communication terminal to the management device;
• a second destination information receiver configured to receive the destination information of the first communication terminal from the management device;
• a second inter-terminal information receiver configured to receive, from among inter-terminal information sent between the first communication terminal and the second communication terminal, the inter-terminal information sent by the second communication terminal, the inter-terminal information to be received including authorization for starting communication between the first communication terminal and the second communication terminal;
• and
• a second inter-terminal information sender configured to send the inter-terminal information indicating the authorization for starting communication to the first communication terminal, based on the destination information of the first communication terminal.