Session initiation protocol (SIP) based voice over internet protocol (VoIP) system and method of registering SIP terminal therein

A method of registering a Session Initiation Protocol (SIP) terminal in a SIP-based Voice over Internet protocol (VoIP) system, the method comprising:

• transmitting a first registration request message to a SIP call server from the SIP terminal;
• transmitting a user information request message to the SIP terminal from the SIP call server, the user information request message comprising an identifier to indicate whether the SIP call server requests a Media Access Control (MAC) address of the SIP terminal;
• determining whether the MAC address is requested based on the user information request message;
• transmitting a second registration request message comprising the MAC address of the SIP terminal to the SIP call server from the SIP terminal in response to a determination that the MAC address is actually requested;
• and
• registering the SIP terminal based on the second registration request message and storing the MAC address to be matched to the registered SIP terminal in the SIP call server, and transmitting a response message to the SIP terminal.

A method of registering a Session Initiation Protocol (SIP) terminal in a SIP-based Voice over Internet protocol (VoIP) system, the method comprising:

• transmitting a first registration request message to a SIP call server and receiving a user information request message from the SIP call server;
• determining whether the SIP call server is requesting a Media Access Control (MAC) address of the SIP terminal based on the user information request message received from the SIP call server;
• transmitting user terminal information comprising the MAC address of the SIP terminal in a second registration request message to the SIP call server in response to a determination that the SIP call server has requested the MAC address of the SIP terminal;
• and
• receiving a response message from the SIP call server to complete registration.

A method of registering a Session Initiation Protocol (SIP) terminal by a SIP call server in a SIP-based Voice over Internet Protocol (VoIP) system, the method comprising:

• receiving a first registration request message from the SIP terminal;
• transmitting a user information request message to the SIP terminal, the user information request message comprising an identifier to indicate whether the SIP call server requests a Media Access Control (MAC) address of the SIP terminal;
• and
• registering the SIP terminal based on a second registration request message received from the SIP terminal, storing the MAC address to be matched to the registered SIP terminal if the second registration request message comprises the MAC address of the SIP terminal, and transmitting a response message to the SIP terminal.