Abstract: In a network having an L2SW in which uplink VLAN is set, a transfer delay of a voice call packet is prevented. In a process of establishing a session between terminals (5), a packet transfer device (1) stores information capable of specifying a sending terminal (5-1) and a receiving terminal (5-2) and a correspondence relation (user connection information) to a connection port into a table. A SIP message of a session control packet communicated between the terminals (5) is snooped, and a destination IP address, a transmission source IP address, a destination port number, a transmission source port number, a connection port etc. are stored into the table. In a case where an RTP packet as voice data is received after the session is established, the packet transfer device (1) performs a loopback transfer or transfers it to an uplink port in accordance with the table.

Abstract: A packet forwarding apparatus comprises a plurality of line interfaces each for communicating with one of user terminals or one of redundant gateways, and a protocol processing unit for controlling packet forwarding among the line interfaces. The protocol processing unit forwards a connection initiation request packet received from a user terminal to the plurality of redundant gateways and forwards to the user terminal only one response packet which is selected according to connection load status information of each gateway stored in a load distribution management table from among a plurality of response packets received from the gateways within a predetermined period of time.

Abstract: A packet forwarding apparatus (L2SW) having a frame segmentation function of converting a extended Ethernet frame such as a MAC-in-MAC frame into a plurality of fragment frames when a payload length of the received frame exceeds a standard MTU size communicable in an Ethernet network to be a forwarding destination, by segmenting the received frame into a plurality of data blocks having a size not longer than the MTU size, and a frame assembling function of restoring an original extended frame from a series of fragment frames received from the Ethernet network.

Abstract: To implement a calling party number anonymous service in an IP telephone service. An IP telephone terminal adds the setting of requesting a Pool IP address along with a normal IP address to a REGISTER message directed from the IP telephone terminal to an SIP server and requests the assignment of a temporary IP address if receiving an anonymous call incoming request message. The SIP server makes the temporary assignment of the Pool IP address and notifies the temporary IP address to a called party IP telephone terminal by adding it to an INVITE message, if the called IP address of the anonymous call incoming request INVITE message is the IP telephone terminal. The called IP telephone terminal receiving the assignment of the temporary IP address can make the connection, communication and disconnection processes employing the temporary IP address as the self IP address in the following dialog.

Abstract: A listening-or-viewing charge is differentiated with bit rates depending on distributed programs. A broadband access server for holding user channels by PPP and replicating and transferring multicast packets have a counter for counting the number of distributed multicast packets and the number of distributed bytes at each multicast group address. The counter values (byte counts and packet counts) when a user joins a multicast group and when the user leaves the multicast group and a multicast session ID containing a PPP user ID and a multicast group address are sent to a multicast accounting radius server. The multicast accounting server provides an accounting on a basis of the byte counts, the packet counts, or a bit rate.

Abstract: Packet forwarding apparatus comprises a plurality of line interfaces and a protocol processing unit for controlling packet forwarding among the line interfaces and for forwarding a connection initiation request packet received from a user terminal to a plurality of redundant gateways, wherein the protocol processing unit has a management table for storing forwarding control information to control forwarding of communication control packets for each user terminal, selectively forwards one of response packets replied from the plurality of gateways in response to the connection initiation request packet to the requester user terminal and discards the other response packets based on the forwarding control information.

Abstract: In a wide area Ethernet network, an edge side gateway (EGW) acquires layer 2 tunneling control information from an authentication server when a PADI is received from a user terminal, stores the correspondence between the source address of the PADI and the layer 2 tunneling control information in its management table, encapsulates the PADI in accordance with the layer 2 tunneling control information, and transmits the encapsulated PADI packet to the wide area Ethernet network. A core side gateway (CGW) having received the encapsulated PADI packet stores the correspondence between the tunneling control information and the source address extracted from the received packet in its management table, and forwards the PADI obtained by decapsulating the received packet to a broadband access server. Thereafter, each of the EGW and CGW forward received packets for the user after converting their format by referencing to the management tables.

Abstract: In a network system where a switching exchange accommodating an ISDN provides TDMoIP packet communication over an IP network, measures for packet loss prevention need to be taken during a period during which a TDM service is packet-transferred over the IP network. When a transmitting-end switching exchange in the above network system multiplexes TDM data, the present invention varies the degree of multiplicity in accordance with the delay in the IP network and the type of data.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: A communication system controls connection to the interface, such as an IP line to which a subscriber terminal connects, according to the information in the tables in which information is registered and updated, wherein the registered and updated information includes information as to which line type, ISDN line or analog line, is used and as to which high way (HW) of a time-division switch (TSW) of a media gateway (management device) is selected for providing TSs (timeslots) for use in the connection, as well as subscriber information on services for which a subscriber contracts.

Abstract: A packet forwarding apparatus with a function of registering packet forwarding control information for each user terminal into a user management table during PPPoE connection and authentication phases in which the apparatus carries out predetermined communication procedures with each user terminal. During DHCP and IP forwarding phases following the authentication phase, the packet forwarding apparatus controls packet forwarding based on the user management table. Packets are forwarded in the form of PPPoE frame until the authentication phase is completed and packets are forwarded in the form of Ethernet frame in the DHCP and IP forwarding phases.

Abstract: The migration of telephone services by a telecommunications carrier from a PSTN to an IP network entails that problem that when it is not possible for some telephone subscribers to migrate to the IP network due to the types of their telephone lines or services they subscribe to, other subscribers also cannot migrate to the IP network until the former subscribers migrate to the IP network. The present invention provides a media gateway that enables a gradual transition from a PSTN to an IP network on a subscriber-by-subscriber basis or on a service-by-service basis so that a telecommunications carrier can efficiently migrate its subscribers while continuing to provide the services the subscribers currently use and reducing burdens on the subscribers.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: A spanning tree is formed for each of MST (Multiple Spanning Tree Protocol) instances defined by a VLAN ID and a COS value. Each terminal apparatus specifies the COS value corresponding to the TCP/UDP port number of a Ethernet frame to be transmitted, based on a conversion table indicating the correspondence of a TCP/UDP port number to a COS value and sets the specified COS value to the header of the Ethernet frame. Each of bridges in the transit network specifies the MST instance identifier of a received frame based on a conversion table indicating the correspondence of the MST instance identifier to the combination of a VLAN ID and a COS value and forwards the received frame in accordance with the spanning tree having the specified MST instance.

Abstract: Any or unique VLAN ID is dynamically assigned to a user terminal connected to a network, and communication by the assigned VLAN ID is enabled. A connection request from a user terminal is directed to L2GWs by a tagged VLAN frame having a common VLAN ID on the network. The L2GWs determine whether the connection request can be met, obtain a VLAN ID that can be assigned to the user terminal from a VLAN ID management server, configure themselves to communicate by the assigned VLAN ID, and report the VLAN ID to the user terminal. The user terminal performs subsequent communication by the reported VLAN ID. L2SWs monitor communication between the user terminal and the L2GWs and configure themselves to allow communication between the user terminal and the L2GWs by the VLAN ID assigned to the user terminal.

Abstract: A packet transfer apparatus has a controller for controlling transmission of a PADO packet on the basis of the information that is previously set in the packet transfer apparatus in order that the PADO packet can be transmitted back to the terminals or a PADI can be discarded when the PADI packet sent from the terminals to the packet transfer apparatus does not have any Service-Name specified. In addition, another controller is used. This controller is provided so that, when a Service-Name that indicates the type of an offered communication service is specified in the PADI packet, it can judge whether the Service-Name is previously registered in a memory and decide to transmit the PADO packet to the terminal if the Service-Name is previously registered, but to discard the PADI packet if the Service-Name is not registered.

Abstract: A frame forwarding apparatus is provided with a frame forwarding processing unit for converting a VLAN ID of a frame received from one subscriber terminal into a group VLAN ID and converting a group VLAN ID of a frame received from an ISP router into a subscriber VLAN ID, by referring to a VLAN bundling table. Each of the entries in the bundling table defines subscriber side line information including a line number of a physical line connected to one of the subscriber terminals and a subscriber VLAN ID, in association with a MAC address of the subscriber terminal and ISP router side line information including a line number of a physical line connected to the ISP router and a group VLAN ID.

Abstract: A packet forwarding apparatus enabling selective provider type access service in a mobile communication network, including a first group of line interfaces connected to routers deployed to service areas of a mobile network, a second group of line interfaces connected to the Internet or to routers belonging to different ISP networks, an ISP management table indicating correspondence of domain name of each ISP networks to an authentication server address, and a controller that identifies, upon receiving from a mobile terminal a request to connect to one of said ISP networks, the domain name of the ISP network from a user ID in the request, transmits an authentication request including the user ID and password specified in said request to an authentication server associated with the ISP network, based on said ISP management table, and notifies the mobile terminal of a result of authentication by said authentication server.

Abstract: A packet transfer apparatus having a plurality of protocol processing units 10 and a switch 20 for switching IP packets among the protocol processing units, wherein a protocol processing unit connected to an IPv4 network includes: input-side address translator CNv6 (I) for translating the address of an input packet to an IPv6 address; output-side address translator CNv4 (O) for translating, when an IPv6 packet is received from the switch, the address to an IPv4 address and transferring the resultant packet to the IPv4 network; and an operation mode controller for omitting address translation by the input-side address translator.

Abstract: An IPv4-IPv6 multicast address translation table is dynamically created, so that it is unnecessary to register multicast servers in advance. When an IPv4 MC group address exists as a response of a DNS server to a DNS request of an IPv6 MC client or when an IPv6 MC group address exists as a response of the DNS server to a DNS request of the IPv4 MC client H1 to H4, DNS Proxy D3 requests an MC adaptive translator T1 to generate a virtual IPv6 MC group address or a virtual IPv4 MC group address, and the MC adaptive translator T1 generates a virtual IPv6 MC group address or a virtual IPv4 MC group address from an address pool, and also creates an MC address translation table, whereby the MC address translation of IPv4-IPv6 can be dynamically performed.