Abstract: A terminal device capable of creating a group for allowing other terminal devices to join the group is provided. When a terminal device not belonging to the group calls a terminal device in the group, any of the terminal devices in the group can answer the call in response a user input. A method for exchanging voice over Internet protocol (VoIP) signaling between the terminal devices within the group is also provided.

Abstract: A terminal device capable of creating a group for allowing other terminal devices to join the group is provided. When a terminal device not belonging to the group calls a terminal device in the group, any of the terminal devices in the group can answer the call in response a user input. A method for exchanging voice over Internet protocol (VoIP) signaling between the terminal devices within the group is also provided.

Abstract: A network device connected to a client includes a table-creation module, a transceiving module, a detecting module, and a translation module. The table-creation module creates an internal table and at least one external table, listing a plurality of real network parameters of the network device, and a plurality of virtual network parameters of the network device, respectively. The real parameters respectively corresponding to the virtual parameters. The transceiving module receives a packet from the network or the client, and forwards the packet. The detecting module detects whether the packet is a voice over Internet protocol (VoIP) packet, and further detects whether the VoIP packet is a VoIP control packet, or a VoIP data packet. The translation module translates network parameters of the VoIP packet according to a corresponding relationship between the internal table and the at least one external table. A packet forwarding method is also provided.

Abstract: A gateway is provided. The gateway (10), connected to a telephone (30) via a telephone network (20) includes a storage module (110), a detecting module (130), and an adjusting module (150). The storage module stores a signal intensity adjusting table, including multiple adjusting levels, and multiple adjusting values corresponding to the multiple adjusting levels respectively. The detecting module detects a tip voltage and a ring voltage of the gateway. The adjusting module computes a line impedance according to the tip voltage and the ring voltage, computes an adjusting level according the line impedance, and adjusts the signal intensity according to the adjusting value in accordance with the adjusting level by inquiring the signal intensity adjusting table. A method for adjusting signal intensity between the telephone and the gateway is also provided.

Abstract: A network device (10) communicates with other network devices with a plurality of loops, and includes a plurality of virtual ringing groups, a plurality of Ringer Equivalency Number (REN) loads (106), a receiving module (100), an assigning module (102), and a ringing module (104). Each virtual ringing group rings during an individually fixed ringing time interval. The REN loads are for generating ringing signals, and the number of REN loads is less than that of the loops. The receiving module receives a calling signal, and transmits the calling signal to one of the loops. The assigning module assigns the calling signal to one of the virtual ringing groups. The ringing module assigns one REN load to the loop with the calling signal according to the assigned virtual ringing group. A load assigning method is also provided.

Abstract: A service switching method includes: providing a time division data bus including a plurality of time slots; receiving a telephone number via a subscriber interface module; determining whether a required service is a first service; assigning a first time slot to the subscriber interface module and a first processing module if the required service is the first service; and transmitting and receiving data between the subscriber interface module and the first processing module via the time division data bus in the first time slot. A voice over Internet protocol (VoIP) device employing the method is also provided.