Internet phone protocol

A method of providing an Internet phone protocol comprising:

• providing a media access control header positioned at the uppermost place for setting a network address of a first Internet phone sending a message and a network address of a second Internet phone receiving the message;
• providing an IP header (Internet protocol header) for setting an IP address and a UDP of the second Internet phone receiving the message;
• providing a frame having a frame check sequence (FCS) for confirming whether a content of the first Internet phone is accurately transferred to the second Internet phone without an error;
• and
• providing a status message header having an interphone number, status information and error information for establishing a direct link between the first and second Internet phones.

An Internet phone comprising:

• means for providing a media access control header positioned at the uppermost place for setting a network address of a first Internet phone sending a message over a network and a network address of a second Internet phone receiving the message;
• means for providing an IP header (Internet protocol header) for setting an IP address and a UDP of the second Internet phone receiving the message;
• means for providing a frame having a frame check sequence (FCS) for confirming whether a content of the first Internet phone is accurately transferred to the second Internet phone without an error;
• and
• means for providing an MOCS call control message having an interphone number, status information and error information for establishing an direct link between the first and second Internet phones.

An Internet phone transfer method for linking, comprising:

• transmitting status information from one of a plurality of Internet phones on a network to all of the other Internet phones connected to the LAN whenever a status of the one Internet phone is changed;
• storing status information of other Internet phones as received by each of the plurality of Internet phones and transmitting a setup message directly to a receiving Internet phone desired for connection, if the receiving Internet phone is in a feasible status for linking;
• and
• transmitting from the receiving the Internet phone a connection message directly to the Internet phone that transmitted the setup message.

An Internet phone protocol transfer method comprising:

• a step in which when a first Internet phone changes from an on hook state to an off hook state for linking to a second Internet phone, status information (‘busy’) of the first Internet phone at the time is provided to all other Internet phones connected to the LAN, and a dial tone is generated at the first Internet phone until buttons of an Interphone number of the first Internet phone are pressed down;
• a step in which when the buttons of the Interphone number are pressed down, a setup message is transferred to a second Internet phone to request the establishment of a link between the first and second Internet phones, and then, the second Internet phone rings if the second Internet phone is in a feasible status for linking, and simultaneously, the second Internet phone transfers a response message to the first Internet phone, while if the second Internet phone is not in the feasible status for linking, the second Internet phone transfers a reject message to the first Internet phone;
• a step in which the first Internet phone received the response message rings back tone, and the second Internet phone transfers a connection message to the first Internet phone, and simultaneously informs all other Internet phones connected to the LAN of its status information (‘busy’), so that the second Internet phone cannot be linked to any other Internet other than the first Internet phone;
• a step in which when the second Internet phone is returned to the on hook state from the off hook state, the second Internet phone transfers a disconnection message to the first Internet phone, while informing the other Internet phones connected to the LAN of its status information (‘idle’) so that the other Internet phones connected to the LAN can recognize that the second Internet phone is in a feasible status for linking;
• and
• a step in which, upon receipt of the disconnection message from the second Internet phone, the first Internet phone generates a guard tone to inform the user of the disconnection of the link, and when the first Internet phone is returned to the on hook state from the off hook state, the first Internet phone informs all of the other Internet phones connected to the LAN of its status information (‘idle’) to indicate that it is in a feasible status for linking, wherein the link between the first and second Internet phones is achieved without using a call server on the LAN.

A method of establishing a communication link between a plurality of Internet phones connected to a local area network (LAN), comprising:

• transferring a status of a prescribed Internet phone from the prescribed Internet phone to the other ones of the plurality of Internet phones;
• receiving and storing the status of the prescribed Internet phone at the age of the other ones of the plurality of Internet phones;
• transmitting a setup message from an initiating one the plurality of Internet phones to at least one receiving Internet phone if the status of the at least one receiving Internet phone is in an available state;
• and
• transmitting a connection message from the at least one receiving Internet phone to the initiating Internet phone upon receiving the setup message from the initiating Internet phone, wherein the communication link between the initiating one of the plurality of Internet phones to the receiving one of the plurality of Internet phones is achieved without using a call server.

A method of establishing a communication link between first and second Internet phones connected to a local area network (LAN), comprising:

• transferring a status of a first Internet phone from the first Internet phone to a second Internet phone over the LAN;
• receiving and storing the status of the first Internet phone at the second Internet phone;
• transmitting a setup message from the second Internet phone to the first Internet phone if the status of the first Internet phone is in an available state;
• and
• transmitting a connection message directly from the first Internet phone to the second Internet phone upon receiving the setup message from the second Internet phone, wherein the communication link between the first Internet phone to the second Internet phone is achieved without using a call server.