System and method for data transfer between terminals in voice communication under voice over internet protocol (VOIP)

A telecommunication service system for coordinating data transfer between VoIP communication terminals, the system comprising:

• a VoIP session coordinator configured to coordinate a VoIP session for a voice communication between a first communication terminal and a second communication terminal;
• a data session coordinator configured to coordinate a data session for a data transfer between the first and second communication terminals, wherein the data session coordinator is configured to establish the data session in response to a data transfer request from at least one of the first and second communication terminals;
• and
• a data converter configured to convert a data format in view of characteristics of the at least one of the first and second communication terminals,
• wherein the data transfer request is received during the VoIP session,
• wherein the data session coordinator determines location information of data to be shared between the first and second communication terminals and determines a sharing method which is selected from among a uni-casting method and a multi-casting method according to a contents file type,
• wherein the contents file type corresponds to at least one contents type from among general documents, web pages, web catalogs, characters, chat messages, image files, motion pictures, and media files,
• wherein at least one from among the VoIP session coordinator and the data session coordinator is implemented as one of a device and a combination of a device and at least one software program,
• wherein the VOIP session is set using a session description protocol (SDP) and the voice communication is performed by real-time transport protocol (RTP),
• wherein traffic control of contents sharing between callers is performed with reference to a contents share server so that terminal-to-terminal quality of service is provided, and
• wherein at least part of information used in coordinating the VoIP session comprises at least one from among a uniform resource identifier, an IP address, and a subscriber profile.

A method for data transfer between communication terminals, the method comprising:

• participating in a voice communication, by a first communication terminal, with a second communication terminal during a VoIP session;
• receiving, by the first communication terminal, a data transfer request from the second communication terminal during the VoIP session;
• transferring, by the first communication terminal, data to the second communication terminal during a data session established using at least part of information used in establishing the VoIP session, and
• converting a format of the data in view of characteristics of the second communication terminal, and
• wherein the data session is established by a contents share server which determines location information of data to be shared between the first and second communication terminals and determines a sharing method which is selected from among a uni-casting method and a multi-casting method according to a contents file type,
• wherein the contents file type corresponds to at least one contents type from among general documents, web pages, web catalogs, characters, chat messages, image files, motion pictures, and media files,
• wherein the VOIP session is set using a session description protocol (SDP) and the voice communication is performed by real-time transport protocol (RTP),
• wherein traffic control of contents sharing between callers is performed with reference to the contents share server so that terminal-to-terminal quality of service is provided, and
• wherein the at least part of information used in coordinating the VoIP session comprises at least one from among a uniform resource identifier (URI), an IP address, and a subscriber profile.