Abstract: A method to wirelessly network a sensor/actuator node is described. The sensor/actuator node is installed in a sensor/actuator node network and arranged in a hierarchical manner with a plurality of node levels and a cluster head network. A unique node identifier is assigned to the sensor node and the sensor node network is initialized. The sensor node is woken-up to perform a task and then set to an active low power mode.

Abstract: The invention is directed to enabling an serving node and a gateway node to be informed of a new route for a new node or sub-network that has become active behind a Mobile Terminal that can also act as a router. When IP level route injection occurs at the Mobile Terminal, a Modify session profile message causes insertion of a new IP address or prefix at a gateway node related to the new route. Also, the gateway node will update the serving node and the Mobile Terminal with information related to the new route or a proposed new route. The Mobile Terminal and the gateway node can share routing information over a dynamic routing protocol. Additionally, the Mobile Terminal and the gateway node can configure static routing information on routes towards each other. The new route can be added with 24.008 and/or GTP messages when initiated on the Mobile Terminal side for either the dynamic or static case.

Abstract: A method and arrangement for processing of CCTrCH data in a UMTS system, by: receiving CCTrCH data across a plurality of radio frames and timeslots (310); storing the received CCTrCH data (320); and upon receipt of complete data for a CCTrCH, processing the stored CCTrCH data through channel processing asynchronously to the received timeslot structure (360). Preferably, the received CCTrCH data is stored in a single RAM memory in link-list form, whereby each timeslot of received CCTrCH data can be independently accessed in the memory. This method of buffering the different parts of the received CCTrCH data, so that they can be recombined before the TrCH decoding and de-multiplexing, is both memory efficient and spreads out the processing load over time.

Abstract: A method according to one embodiment of the invention monitors a paging channel from one wireless network during an active communications session with another wireless network.

Abstract: A method for optimizing a communications network such as a wireless telecommunications network, having central switch nodes and intermediate base station transport nodes, via a non-hierarchical clustering technique is provided. At least one of the central switch nodes may be fixed in location, the remaining central switch nodes being moveable. After an initial network configuration is obtained, distances from each base station to each central switch node are calculated and the nearest central switch node to each base station is determined. Each base station is assigned to its nearest central switch node. Thereafter, the moveable central switch nodes are relocated to the location minimizing the sum of the distances between each base station assigned to the switch and the switch.

Abstract: A communication apparatus is applicable to a communication system such as a wireless LAN, and is always capable of establishing good communications in an automatic and speedy manner thereby to eliminate human operations and achieve the low cost irrespective of the presence or absence of jam transmissions. The communication apparatus can wirelessly communicate with terminal devices 1A, 1B. A channel setting part 31 is able to set a plurality of communication frequency bands with a specific communication frequency band being set as a default. An SN ratio detection part 34 detects the communication conditions of a plurality of communication frequency bands, which can be set by the channel setting part 31, by detecting SN ratios thereof.

Abstract: The invention relates to a method for detecting travel information in a traffic network covered by a cellular mobile radio network with a plurality of base stations provided with a clear identifier and wherein a plurality of vehicles move, said vehicles being respectively provided with an operating mobile terminal for the mobile radio network. Information on the contact between the end terminals and the base stations is used to estimate the location of the terminals. At least for one part of the traffic network, wherein the base stations have a transmission range with a cell radius corresponding to the distance separating neighboring traffic routes, characteristic models are determined in the form of sequences of identifiers of said base stations with which a terminal respectively enters into contact when it is displaced along a route, allocated to the respective route and permanently stored.

Abstract: A method for establishing a connection between a circuit-switched mobile station (MS) and a packet-switched switching element (MSC). A radio network controller (RNC) receives a first initiation signal (an attach request) from the mobile station (MS) via a circuit-switched connection. The RNC opens a signaling connection for the mobile station. While the signaling connection is active, the RNC receives a second initiation signal (call setup) and opens a real-time connection for the mobile station. Thus the packet-switched switching element (MSC) is able to switch a real-time connection to/from the circuit-switched mobile station (MS).

Abstract: A hybrid access terminal is a Wireless Communication Device (WCD) capable of operating over different types of communication networks. An exemplary WCD operates on both IS-2000 and IS-856 networks, and is capable of inter-system handoffs between these two types of networks. Such capabilities enable the exemplary WCD to provide voice, data and short messaging services on IS-2000 networks, and also to provide high speed packet data service on IS-856 networks. A method of operating on different networks includes establishing a data session on the first network, detecting a request for a packet data service, handing-off the data session to a second network, detecting a dormancy of the data session, transitioning to a dormant state and initiating a Dormancy time-out period when the dormancy is detected, and monitoring both the first network and the second network for paging messages while in the dormant state.

Abstract: A receiver of a multicarrier communication system capable of reducing inter-subcarrier interfering signals is to be provided. Receive signals received by a receiving antenna are amplified by a receiving amplifier, subjected to quadrature demodulation by multipliers with respect to the respective subcarriers, and band-limited by lowpass filters. The signals band-limited by the lowpass filters are converted into digital signals by A/D converters at a sampling frequency fs. With respect to the receive signals converted into digital signals, interfering signals leaking between subcarriers are estimated by using A/D converted by the A/D converters and are canceled. The receive signals reduced in interfering signals are multiplexed into a single sequence by a multiplexer, and decoded by a decoder into output signals.

Abstract: A novel and improved method and apparatus for high rate CDMA wireless communication is described. A set of individually gain adjusted subscriber channels are formed via the use of a set of orthogonal subchannel codes. The set of sub-channel codes are comprised of four Walsh codes. The pilot data and control data are combined onto one channel. The remaining two transmit channels are used for transmitting non-specified digital data including user data or signaling data, or both.

Abstract: Data transmission apparatus for transmitting the data of a data frame as a plurality of packets, comprising: segmentation apparatus capable of identifying delay-critical data within the data frame, and forming a plurality of packets comprising data of the data frame, wherein the identified data is formed in to one or more packets capable of being decoded independently of the other packets; and a transmitter for transmitting the packets.

Abstract: A wireless local area network system comprises an ATM switch (10) coupled to an access point (12) having a transceiver and a plurality of mobile terminals (14) each having a transceiver. The transceivers operate in accordance with an Orthogonal Frequency-Division Multiplexing (OFDM) transmission scheme having a plurality of channels. In response to the access point (12) polling the mobile terminals (14) enquiring if they want a time slot in the next down-link frame, those mobile terminals wanting a time slot transmit an E-burst on selected ones of the plurality of channels whose phases are selected to minimise the transmitted peak to mean envelope power. Optionally the E-burst can be modulated to provide a limited amount of signalling information.

Abstract: The present invention discloses a communication terminal accommodation device that makes communication terminals under the control of different wireless LAN systems communicate with each other. In a first system, the transmission and reception periods of a downlink signal, a direct-link signal, and an uplink signal are set after the transmission and reception periods of RCH, BCH, FCH and ACH control channels. In a second system, the transmission and reception period of a PCF mode is set immediately after a beacon, and the transmission and reception period of a DCF mode is set after that. In the first system, a period after the PCF mode of the second system is set as an unused period, and the RCH reception period is set to start at the start time of the PCF mode of the second system.

Abstract: A wireless local area network (WLAN) transceiving integrated circuit services voice communications in a WLAN with at least one other WLAN device and includes a WLAN interface, a transcoder, and a switch box. The WLAN interface wirelessly communicates with at least one WLAN device to receive inbound packetized audio data from the at least one WLAN device and to transmit outbound packetized audio data to the at least one WLAN device. The transcoder receives the inbound packetized audio data and converts the inbound packetized audio data to inbound Pulse Code Modulated (PCM) WLAN audio data. The WLAN interface also receives outbound PCM WLAN audio data and converts the outbound PCM WLAN audio data to the outbound packetized audio data. The switch box operably couples between the transcoder and a PCM bus, to which an audio COder/DECoder (CODEC) couples. A speaker and a microphone coupled to the audio CODEC.

Abstract: A wireless local area network (WLAN) transceiving integrated circuit includes a WLAN interface, an input buffer, an input buffer controller, and a processor. The WLAN transceiving integrated circuit may also include an output buffer, an output buffer controller, a transcoder, and/or an audio Coder-Decoder (CODEC). The WLAN transceiving integrated circuit is installed in a WLAN device that services voice communications. The input buffer receives packetized audio data from the WLAN interface. When the input buffer satisfies a buffer vacancy threshold, the processor and the input buffer controller cooperatively operate to fill at least a portion of the input buffer with packetized audio data. The processor copies packetized audio data from the input buffer and fills the input buffer with the copied packetized audio data to maintain an audio pattern in the input buffer. The input buffer controller fills the input buffer when the processor is available and after copying/filling is no longer effective.

Abstract: A wireless local area network (WLAN) transceiving integrated circuit services voice communications in a WLAN with at least one other WLAN device. The WLAN transceiving integrated circuit includes a WLAN interface, an input buffer, a transcoder, and a processor. The WLAN interface wirelessly communicates with the at least one WLAN device to receive packetized audio data from the at least one WLAN device. The input buffer operably couples to the WLAN interface and receives the packetized audio data from the WLAN interface. The transcoder operably couples to the input buffer and receives the packetized audio data from the input buffer. The transcoder converts the packetized audio data to Pulse Code Modulated (PCM) audio data and outputs the PCM audio data to a coupled audio COder/DECoder (CODEC). The processor operably couples to the WLAN interface, the input buffer, and the transcoder.

Abstract: A method for setting and adjusting MAC fragmentation threshold for IEEE 802.11 networks operating at different data rates is presented. The fragmentation threshold is adjusted based on throughput performance, delay constraints and hidden node influence.

Abstract: A method is provided for transmitting wireless signals in a network comprising a network coordinator and one or more remote devices. The available transmission time is divided into a plurality of superframes, each of which is further divided up into a beacon duration, one or more management time slots, one or more guaranteed time slots, and one or more asynchronous time slots. Each of the management time slots, guaranteed time slots, and asynchronous time slots are assigned to one of the one or more remote devices. The network coordinator sends a beacon to the one or more remote devices during the beacon duration. The device or coordinator assigned to the current guaranteed time slot sends frames of isochronous data in the current guaranteed time slot. The device or coordinator assigned to the current asynchronous time slot sends frames of asynchronous data in the current asynchronous time slot.

Abstract: A packet switched streaming implementation for a WCDMA network in which media information is carried on a separate radio access bearer from control information, whereby only the media information need have real time quality of service.

Abstract: A device for activating a signal emitter for use in a firefighter locator system operates in conjunction with the firefighter's self-contained breathing apparatus (SCBA). The activation device includes a pressure sensor to monitor pressure on an air line that delivers air from the SCBA air tank to the SCBA air regulator. When the firefighter opens the SCBA air tank valve, pressure is sensed in the air line and the emitter is activated to transmit a signal. The signal is received by base stations that then use the signal to locate/track the signal emitter. Preferably, the activating system also includes a user operated reset button(s) and a shutoff circuit to allow the user to stop transmission of the signal by the signal emitter. The shutoff circuit is designed to stop transmission of the signal only after the air line has been depressurized and the reset button(s) is depressed.

Abstract: Data of a transport block set is to be transmitted in a wireless communication system. The wireless communication system uses adaptive modulation and coding and has a physical layer hybrid automatic repeat request mechanism. Segmentation information for potential segmentation of the transport block set is provided. The transport block set is transmitted with a first specified modulation and coding scheme. The transport bock set is received and whether the received transport block set is determined to meet a specified quality. When the specified quality is not met, a repeat request is transmitted. The first specified modulation and coding set is changed to a second specified modulation and coding set. In response to the repeat request, the transmit block set is segmented into a plurality of segments supported by the second specified modulation and coding set in accordance with the provided segmentation information. The segments are transmitted and at least two of the segments are transmitted separately.

Abstract: A radio access network includes a transport network layer; a radio network layer having a layer 2 network for communicating between entities within the radio network layer by exchanging datagrams having a predetermined format used only within the radio network layer. Accordingly, the present invention provides for a true decoupling at layer 2 between the radio network layer and the transport network layer. Addressing at layer 2 can enable both connectionless and connection oriented using an overlay connectivity model. Layer 2 in the radio network layer is implemented as an Ethernet network.

Abstract: 18A method and system for controlling the switching and control operation of at least one of an Softswitch system, an Signal Transfer Points (STP) and a gateway (GW) (e.g., in a SS7 signaling environment). By providing support for redundancy, a second switch system can take over the routing and control operations of a first switch system when the first switch system experiences difficulty. Difficulty may be any one of several forms (e.g., switch crash, congestion, hardware failure).

Abstract: An integrated IP network telephone distributor with switching and routing functions is disclosed. A packet classifying device performs a packet classifying process to the network packets received from a network for classifying the network packets into voice package or data package. The voice packet is sent to a voice processing circuit to be transformed into voice signal for output, while the data packet is sent to a connected personal computer.

Abstract: A net-aware telephone switch enabling a user to receive or send calls from/to both the Internet and the PSTN comprises a two-line switch connecting with the communication terminal for switching the outgoing call between IP call mode and PSTN call mode; a CPU, operated for sending out an IP call and receiving an IP call to/from the outside; a storage, for storing programs and data required for sending out or receiving the IP call; a connector for connecting the net-aware telephone switch with the Internet; and a bus for connecting all the above components with each other and for transferring data among them.

Abstract: Controlling a user's usage of network resources, after the user has been authenticated, without using any network resources beyond the user's entry point to the network. A plurality of users may be connected to an entry point of a network of a network device by a shared transmission medium. Each users' usage of network resources is controlled, after such user has been authenticated, without using any network resources beyond such user's entry point to the network. For each one or more users, packet rules may be provisioned to the user's entry point to the network, where such entry point may be shared with other users. The packet rules may be applied to each packet received from the user before any network resources beyond the entry point are used. These packet rules may be associated with an identity of the user and then provisioned to the user's entry point in response to the user being authenticated.

Abstract: Techniques for determination of endpoint Internet Protocol (IP) address assignment in an Internet telephony system are disclosed. In conjunction with the establishment of a voice path between an endpoint and a gatekeeper in the Internet telephony system, a virtual address assigned to the endpoint in a network address translation operation is determined. The virtual address is then communicated to the endpoint as part of or otherwise in conjunction with a registration process prior to establishment of the voice path such that the registration process can complete successfully despite the network address translation operation. Advantageously, the invention overcomes problems associated with voice path registration failures resulting from network address translation in a router, virtual private network (VPN) gateway or other similar network address translation device.

Abstract: A traffic concentrator for combining a plurality of digital data streams into at least one higher speed digital data stream is provided. The traffic concentrator includes a plurality of inputs that are adapted to receive the plurality of digital data streams. The traffic concentrator further includes a memory that has first and second portions. The traffic concentrator also includes a control circuit that is coupled to the plurality of inputs and the memory. The control circuit generates control signals for storing data from the plurality of digital data streams in one of the first and second portions of the memory during a first time slot. The control circuit further retrieves the data from the portion of the memory during a subsequent time slot for combination and transmission as the at least one higher speed digital data stream.

Abstract: In a communication system having a first network unit and a second network unit, a plurality of subscriber units which transmit and receive signaling messages to the second network unit are provided in the first network unit. The signaling messages of the subscriber units are in each case divided into a first class of signaling messages and into a second class of signaling messages. The signaling messages are transmitted between the first network unit and the second network unit via a common link. In the case where a measured utilization of the common link exceeds a first threshold, the transmission of signaling messages assigned to the second class is interrupted for all subscriber units. In the case where the measured utilization of the common link drops below the first threshold and exceeds a second threshold which is lower than the first threshold, the transmission of signaling messages assigned to the second class can be interrupted for some subscriber units.

Abstract: A redundant multistage network can be expanded by increasing the fanout of each router in a non-stop manner, involving a port addition, a reconfiguring and an activation section. The port addition section involves the addition of new ports to each switching element. The reconfiguring section involves the selection of a port and disconnecting any connections necessary to connect that port with its proper corresponding port as derived from the final desired topology. This section can further include the optional permutation of port address to minimize traffic disruption. The activation section involves attaching any new external ports desired to external sources and putting those new connections into service.

Abstract: An optical routing device for wavelength division multiplexed (WDM) optical signals includes an optical switch matrix (50) having a first optical switch array (54) and a second optical switch array (52), the first optical switch array being adapted to couple optical signals to the second optical switch array on the basis of the wavelength of respective optical signals. The second optical switch array (52) includes a number of optical switch devices, each of which is dedicated to route traffic on a respective wavelength. The device includes a drop traffic path and a through traffic path, in which the drop traffic path includes a transponder unit (170; 220) that is selectively reconfigurable to couple signals to a through traffic path and thereby provide a signal regeneration path. The transponder unit (170; 220) may be tunable so as to provide a wavelength translation function for any optical signal received by the transponder unit. This feature enables efficient sharing of transponders.

Abstract: A data communication controller processes incoming data frames. The controller includes a pre-processing block for receiving data frames and a frame processing unit coupled to the pre-processing block. The pre-processing block is configured to compare header fields of a current frame with header fields of a previous frame. The pre-processing block provides an output signal to the frame processing unit on the basis of the comparison of the header fields of the current and previous frames. The controller may operate in accordance with the Fibre Channel protocol, and the output signal may include bits to indicate that the current frame is of the same exchange, of the same sequence, and is next in sequence relative to the previous frame.

Abstract: A switched platform management architecture and related methods are generally described. In accordance with but one aspect of the present invention, a method is presented comprising receiving a datagram through an intelligent platform management communication channel, and analyzing at least a subset of the received datagram for information necessary to identify routing information of the received content.

Abstract: A method and system for forwarding traffic through a network node involve translating a virtual local area network identifier (VLAN ID) of received VLAN traffic from an input VLAN ID to an output VLAN ID (or VLAN IDs) before the traffic is transmitted from the network node. In an embodiment, the input VLAN ID is different from the output VLAN ID. In an embodiment, VLAN ID translation occurs at port interfaces within the network node that receive incoming VLAN traffic. In an embodiment, each port interface can be configured to independently translate input VLAN IDs to output VLAN IDs and output ports.

Abstract: An embodiment of this invention pertains to a network processor that processes incoming information element segments at very high data rates due, in part, to the fact that the processor is deterministic (i.e., the time to complete a process is known) and that it employs a pipelined “multiple instruction single date” (“MISD”) architecture. This MISD architecture is triggered by the arrival of the incoming information element segment. Each process is provided dedicated registers thus eliminating context switches. The pipeline, the instructions fetched, and the incoming information element segment are very long in length. The network processor includes a MISD processor that performs policy control functions such as network traffic policing, buffer allocation and management, protocol modification, timer rollover recovery, an aging mechanism to discard idle flows, and segmentation and reassembly of incoming information elements.

Abstract: This invention describes a switched full-duplex Ethernet type communication network comprising at least one source subscriber equipment (13) and at least one destination subscriber equipment (14) connected to each other through at least one physical link through at least one switch and at least one virtual link (VL), which is the conceptual representation of a link from a source equipment (13) to at least one destination equipment (14), in which each equipment transmitting Ethernet frames comprises:

Abstract: A services processor includes an editing unit, which performs various functions for editing data packets, such as packet creation, packet encapsulation, and packet replication.

Abstract: SDH/SONET signals are transported as a service including payload and overhead information by mapping associated payload data or information and selected associated overhead data or information of at least one SDH/SONET client signal to be transported into a SDH/SONET server signal. More specifically, client overhead information of the SDH/SONET client signal is mapped into free overhead positions of the SDH/SONET server signal. The SDH/SONET server signal is then transported with the SDH/SONET client signal including associated payload and overhead information embedded therein.

Abstract: A system and method for fault tolerant multimedia communication provides a first connectionless channel for communicating packets from a server to a client. Packets are either header packets or media packets. Header packets include only a header payload providing information pertaining to succeeding media packets. One or more media packets corresponding to a single frame of video succeeds each header packet. The client detects missing packets and determines whether or not the missing packet is a header packet. If a header packet is missing, the corresponding succeeding media packets are not processed. Instead, the system waits until the next header packet is received to resume processing of media packets succeeding that next received header packet. If a media packet is missing, the client may continue processing media packets received, although the resulting video may be somewhat distorted, especially if the received media packets depend upon the missing media packet for proper processing.

Abstract: The present invention relates to a method of blocking undesired traffic in data communication systems that uses packet switching. Blocking is effected by determining the sender address of incoming data packets, and then comparing this address with a list of reliable addresses. The data packet is erased immediately, if the sender addresss is not included in the list. The list of accepted addresses can be created in several wayoi among others by including in the list addresses to which the user has himself sent data, these addresses therefore being considered reliable addresses. Addresses of friends and acquaintances can also be inserted in the list manually. The invetion thus enables undesired data from unreliable senders to be avoided. Such data loading limited resources, such as wireless internet connections for example. Neither is there any risk of the receiver being required to pay for information that he himself has not requested.

Abstract: The invention relates to a packet switching device comprising a plurality of line cards (1 and 2), each consisting of a port control system (6 and 7) for storing and arranging packets in output queues and for the clocked generation and amendment of weightings containing information about the states of the output queues, and comprising a plurality of switch cards (3 to 5), each consisting of a crosspoint matrix (8) and an arbiter (9) for controlling the crosspoint matrix (8). Herein, the port control systems (6 and 7) each transmit to the arbiter (9) an amended weighting selected from a Table using a round robin method (30).

Abstract: A packet transmission scheduling device and packet transmission scheduling method with improved required quality for packets, propagation channel quality and throughput, and which, as well as eliminating delays, performs packet transmission with favorable affinity with wireless resources, wherein a plurality of packet flows input in parallel are stored in output standby packet buffers for each of the flows, the output order priority of each packet flow is determined based on any one of the conditions of packet priority, propagation channel quality, allocatable wireless resources are estimated, and estimated allocatable wireless resources are assigned in a wireless resource allocation means to the packet flows stored in buffering means.

Abstract: A differentiated services device is described. In one embodiment, the differentiated services device includes: a traffic metering unit to indicate whether an information element in a flow conforms to a peak rate and a committed rate; a storage congestion metering unit to determine whether the information element should be accepted or discarded; and a marking unit to mark the information element with one of a plurality of mark values, wherein the marking unit is coupled to the traffic metering unit and the storage congestion metering unit. Also, a method of marking an information element in a flow is described. In one embodiment, the method includes: indicating whether the information element in the flow conforms to a peak rate and a committed rate; determining whether the information element should be accepted or discarded; and marking the information element with one of a plurality of mark values.

Abstract: In a system in which communication is performed among a plurality of devices having a mechanism of disassembling a packet into ATM cells to send them and a plurality of devices having a mechanism of assembling the received ATM cells into the packet, a frame is prevented from being lost owing to change of virtual connections in the course of transferring the frame, improving reliability of the communication on the packet level.

Abstract: The present invention provides a method, apparatus, and a computer program product for selective directional wireless communication. The apparatus comprises a computer system with a directional communication module. The present invention takes advantage of directional antennas in order to optimize wireless communication by minimizing interference with neighboring nodes. The technique presented is a CSMA/CA-based reservation protocol that improves the multiple access throughput of a wireless ad-hoc network by efficiently utilizing the interference reduction feature of switched-beam antennas by balancing the number of neighbors that need to back-off and the number of control/data packet collisions.

Abstract: An excess-port network switch includes a plurality of ports configured to receive and transmit data. The plurality of ports is adapted to have a configured throughput. The excess-port network switch also includes a switch fabric configured to route data between the plurality of ports, where the switch fabric is also configured to have a predetermined throughput being less than the total configured throughput of the plurality of ports.

Abstract: A system and method for managing user preference settings in a vehicle includes an electronic control unit having a microcontroller and memory. The electronic control unit controls vehicle accessory devices. A data controller is in communication with the microcontroller of the electronic control unit for receiving the user preference data to control the accessory devices. The keyless receiver is in communication with the microcontroller of the electronic control unit for receiving a control signal from a key fob. A PDA including a processor, memory, and transceiver in electrical communication can be used to transmit the user preference data to the data controller. The preference data is transmitted to the memory of the electronic control unit, which executes an algorithm to control the accessory devices according to the user preference data.

Abstract: A method and apparatus for effecting multi-party teleconferencing that avoids the need for tandem vocoding of packet based information from conference call participants. In particular, the teleconferencing bridge infrastructure utilizes packet tagging of encoded packets with a tag as well as adaptive scheduling of bandwidth to transmit packet based information to the end user call participants. Decoding is accomplished at each end user based on information included within the tag such that an appropriate decoding algorithm is selected for the packet-based audio information thereby avoiding tandem vocoding.

Abstract: Telecommunication systems should be able to handle different protocols. Thereto, with a first protocol being Internet Protocol v6 using 128-bit addresses of a first kind and with a second protocol being Internet Protocol v4 using 32-bit addresses of a second kind, an access system (1) is provided with a generating section (21) for, in response to an address of one kind, generating a corresponding address of an other kind for a terminal-to-terminal communication and independently of which terminal has initiated said terminal-to-terminal communication. For a set-up phase, a replacing section (22) replaces addresses of a second kind by corresponding addresses of a first kind, and an adding section (23) adds, in addition to addresses of a first kind, corresponding addresses of a second kind, in set-up messages. For a communication phase, activating sections (24,25) activate translating sections (11,12), which translating sections (11,12) translate addresses of one kind into addresses of an other kind, in packets.