Abstract: A method for reducing a risk of a call connection failure in a video communication providing a multimedia ring back tone service includes replying to a call connection request from a calling terminal, receiving a first message, determining whether the first message includes predetermined data and if the first message includes the predetermined data, setting a second message from the calling terminal as an initial value for a Numbered Simple Retransmission Protocol (NSRP) session with the calling terminal. The predetermined data may include a video temporal spatial tradeoff command, miscellaneous video temporal spatial indication, or a video fast update picture command. A system to perform the method includes a receiving unit, a determination unit, and a setting unit.

Abstract: A terminal includes a communication unit to transmit a first custom message to a called terminal according to a video call request, and to receive a connect message from the called terminal; and a connection unit to setup a session for the video call with the called terminal, and if a second custom message is received from the called terminal, to replace the session with a fast session for a high-speed video call. A method for establishing the fast session of a video call includes transmitting the first custom message to the called terminal, receiving a connect message, setting up a session for the video call with the called terminal, and replacing the session with a fast session for a high-speed video call if a second custom message is received from the called terminal.

Abstract: A terminal includes a communication unit to transmit a first custom message to a called terminal according to a video call request, and to receive a connect message from the called terminal; and a connection unit to setup a session for the video call with the called terminal, and if a second custom message is received from the called terminal, to replace the session with a fast session for a high-speed video call. A method for establishing the fast session of a video call includes transmitting the first custom message to the called terminal, receiving a connect message, setting up a session for the video call with the called terminal, and replacing the session with a fast session for a high-speed video call if a second custom message is received from the called terminal.

Abstract: A method for reducing a risk of a call connection failure in a video communication providing a multimedia ring back tone service includes replying to a call connection request from a calling terminal, receiving a first message, determining whether the first message includes predetermined data and if the first message includes the predetermined data, setting a second message from the calling terminal as an initial value for a Numbered Simple Retransmission Protocol (NSRP) session with the calling terminal. The predetermined data may include a video temporal spatial tradeoff command, miscellaneous video temporal spatial indication, or a video fast update picture command. A system to perform the method includes a receiving unit, a determination unit, and a setting unit.