Patent ID: 7941134
Filing Date: 2011-05-10
Classification: H04W

Abstract:
1. A push-to-talk communication system, comprising: a plurality of portable terminals; and a server connected to said portable terminals through a communication network, said server configured to manage group communication between said portable terminals, said server comprising i) call control means for performing communication control between said portable terminals which perform group communication, and ii) real-time communication means for receiving and delivering data between said portable terminals which participate in group communication in accordance with communication control by said call control means, said call control means comprising data format check requesting means for issuing a request to check a data format of data to be delivered with respect to each of said portable terminals, and said real-time communication means comprising i) reception means for receiving data transmitted form said portable terminal, ii) data conversion means for converting the received data into a predetermined data format in accordance with a response from said portable terminal to the request by said call control means, and iii) delivery means for delivering the converted data to another portable terminal, wherein said data format check requesting means is configured to show each of said portable terminals compatible with moving image data a set of available data formats including moving image data formats and sound data formats to allow the portable terminal to prompt a user thereof to select a data format, and wherein said portable terminal comprises response means for selecting an arbitrary data format on the basis of a request from said data format check requesting means of said server, and returning a request for delivery in the selected data format to said server.