Abstract: A re-transmission method is provided. The method includes: generating, at a transmitting party, a packet; adding, at the transmitting party, parity check bits to the packet to form a new packet; transmitting, at the transmitting party, the new packet to a receiving party; determining, at the transmitting party, whether an ARQ feedback is received, wherein the ARQ feedback indicates which half part of the packet is found erroneous at the receiving party if the packet is found erroneous at the receiving party; determining, at the transmitting party, which half part of the packet is found erroneous based on the ARQ feedback if the ARQ feedback is received; and re-transmitting, at the transmitting party, the half part of the packet which is found erroneous at the receiving party.

Abstract: A voice over internet protocol (VOIP) system and method are provided. The VOIP method includes steps of generating a phone number for a first terminal device, and a domain name corresponding to that phone number, transmitting the domain name and an internet protocol (IP) address to a dynamic domain name service (DDNS) server for registration, applying the same procedure to second and third terminal devices, generating a name of a group for the first, second, and third terminal devices, generating a domain name corresponding to the name of the group, and transmitting the domain name and the IP address for registration, and acquiring the domain name for the required name of the group, thus allowing calls to be made and available within the group.

Abstract: A voice over internet protocol (VOIP) system and method are provided. The VOIP method includes steps of generating a phone number for a first terminal device, and a domain name corresponding to that phone number, transmitting the domain name and an IP address to a DDNS server for registration, applying the same procedure to second and third terminal devices, generating a name of a group for the first, second, and third terminal devices, generating a domain name corresponding to the name of the group, and transmitting the domain name and the IP address for registration, and acquiring the domain name for the required name of the group, thus allowing calls to be made and available within the group.

Abstract: A gateway includes a plurality of line cards and a management board. One of the plurality of line cards connected to one user terminal transmits an Internet control message (ICM) packet with off-hook information of the user terminal. The management board receives the ICM packet with the off-hook information from the line card, and transmits a call request packet to the media gateway controller according to an Internet protocol (IP) address of the management board. The management board further receives a call response packet including a dial tone from the media gateway controller, and transmits an ICM packet with the dial tone to the line card connected to the user terminal. The line card connected to the user terminal further transmits the dial tone to the user terminal. Thus the signaling connection between the gateway and the media gateway controller is established.