Abstract: A base station including a plurality of codebooks embodied on a computer readable storage medium. The base station further includes a transceiver configured to i) notify a first receiver of a first codebook of the plurality of codebooks to be used for transmissions between the base station and the first receiver, ii) notify a second receiver of a second codebook of the plurality of codebooks to be used for transmissions between the base station and the second receiver, iii) receive, from the first receiver, a first precoding vector from the set of precoding vectors in the first codebook, iv) receive, from the second receiver, a second precoding vector from the set of precoding vectors in the second codebook, v) transmit, in accordance with the first precoding vector, first data to the first receiver, and vi) transmit, in accordance with the second precoding vector, second data to the second receiver.

Abstract: A method is provided for transmitting an uplink scheduling request in a mobile communication system. A terminal compares a lowest priority for permitting transmission of the scheduling request notified from a radio resource controlling node with a highest priority among service priorities corresponding to generated data or control signals, if data or control signals to be transmitted in the uplink are generated from an upper layer. The terminal transmits the scheduling request to the radio resource controlling node to thereby request the radio resource controlling node to allocate radio resources for transmitting the data or control signals, when the highest priority is greater than or equal to the lowest priority.

Abstract: A communications system for exchange of information between a base station and a terminal by a multicarrier transmission mode using a plurality of subcarriers. The communication system includes a base station, a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data between said communication apparatuses; and a transmitter configured to transmit the frequency band information, using a specific frequency band, set from among a plurality of frequency bands assigned to the communications system, and to transmit data by using at least one frequency band set from among said plurality of frequency bands, and at the time of establishing the wireless channel, the frequency band usable by the communications apparatus is restricted, and said specific frequency band and said at least one frequency band set, other than the specific frequency band, are assigned within that restricted frequency band.

Abstract: An apparatus or method for transmitting data blocks on a communications channel having a radio link between two stations including a user equipment comprises receiving first data blocks from the user equipment, and transmitting second data blocks to the user equipment. A polling interval is dynamically set for the transmission of polling messages to the user equipment after transmission of the second data blocks, the polling interval being set in accordance with at least one of: a size of one or more data blocks received by the apparatus from the user equipment, a size of one or more blocks transmitted from the apparatus to the user equipment, and a service to which the user equipment is subscribed. The apparatus may be used as a PCU in a cellular mobile telephone system.

Abstract: A base station apparatus capable of communicating with a user equipment terminal using a downlink shared channel is disclosed. The base station apparatus includes a radio resource allocation unit allocating radio resource blocks to the shared channel after allocating the radio resource blocks to at least one of a synchronization signal, a common control channel, a broadcast channel, a paging channel, an MBMS channel, and a random access response channel.

Abstract: A transmitting apparatus is capable of transmitting data at a first frequency and second frequency to a receiving apparatus. A transmitter of the transmitting apparatus transmits a predetermined wideband signal, in a first time period in a frequency band which does not include the first frequency and in a second time period in a frequency band which does not include the second frequency. A quality measuring unit of the receiving apparatus measures the quality of communication with the transmitting apparatus based on the wideband signal received in the first and second time periods.

Abstract: The embodiments disclose a method for scanning in a radio communication system, in particular in a WLAN (Wireless Local Area Network), including transmitting by a MS on all channels a probe message containing the IP address of the original AP of the MS and an MAC address of the MS; switching to the original channel; transmitting a response inquiry message to the original AP; and receiving a probe response message within a predetermined period, wherein, if the AP of the probe message received on the channel is not the original AP, then the AP transmits the probe response message containing the MAC address to the original AP according to the IP address; and the original AP buffers the probe response message received, and transmits the probe response message to the MS according to the MAC address after the response inquiry message sent by the MS has been received. The embodiments further disclose a scanning system in a WLAN.

Abstract: A system and method for allowing legacy circuit switch user equipment (CS UE) to operate via a packet switch system, such as an IP Multimedia Subsystem (IMS) system, is provided. The mobility and session control aspects of communications with the legacy CS UE is separated. A user agent is placed in the receiving node (e.g., a home node B) that acts as the SIP agent for the CS UE for session control. An interworking function is provided to allow mobility between the macro CS network and the PS (e.g., IMS) network. Hand-back and hand-in procedures with service continuity are also provided.

Abstract: A method for controlling access of a terminal to a Home (e)NodeB by a network entity, the terminal accessed to the Home (e)NodeB operated in a closed access mode or a hybrid access mode by using a specific closed subscriber group (CSG) ID, the method comprises: recognizing by the network entity, that an allowed access timer of the specific CSG ID with respect to the Home (e)NodeB has expired; transmitting an Update Bearer Request message to other network entity in order to change a membership of the expired CSG ID; transmitting a Bearer Modify Request message to the Home (e)NodeB in order to change a membership of the expired CSG ID; and updating a bearer with said other network entity, and a bearer with the Home (e)NodeB.

Abstract: There is provided a method including providing a local breakout service to an Internet protocol gateway while retaining user access control and a remote Internet protocol gateway of a packet core network of a radio network for a mobile terminal; providing information on neighboring macro cells in which the local breakout service can continue, the macro cells belonging to a network using another tracking area than that of the serving cell of the mobile terminal; executing a handover process of the mobile terminal from a source base station in the serving cell of the mobile terminal to a target base station in a neighboring macro cell; and providing session continuation of the mobile terminal local breakout service traffic in the neighboring macro cell by controlling user plane tunneling between the target base station and the local packet switched network from which an Internet protocol address for the local breakout service was assigned.

Abstract: A fast uplink data transmission method for a handover is disclosed. This method effectively uses a handover signal when there is data to be transmitted to an uplink during an Intra Radio Access Technology (I-RAT) handover, such that it quickly transmits and receives uplink data. The method of transmitting uplink data in a wireless access system includes, transmitting a message including an information bit to a target base station by a mobile station during a handover, wherein the information bit indicates whether the uplink data is present, and receiving a radio resource for transmitting the uplink data from the target base station, if the information bit indicates the uplink data is present, wherein the radio resource is allocated by the target base station. So, uplink user data can be quickly transmitted to a destination while the UE performs the handover.

Abstract: A method and apparatus for providing load state information of a Base Station (BS) in a broadband wireless communication system are provided. The method includes determining a ratio of a whole allocated resource compared to a whole resource of the BS and a ratio of a resource allocated for a rate requiring security compared to the whole resource, generating at least one load indicator for indicating a first value expressing the ratio of the whole allocated resource and a second value expressing the ratio of the resource allocated for the rate requiring security, and transmitting the at least one load indicator.

Abstract: To enable a network apparatus to detect L3 roaming users and to take appropriate forwarding actions, L3 knowledge is introduced inside an L2 bridge forwarding table in the network apparatus. As a client moves from a subnet associated with a first network element to a subnet associated with the network apparatus, a determination is made regarding whether the client is roaming by evaluating a source IP address within a L3 packet header within a first frame received at the network apparatus. If, as a result of the evaluating step, it is determined that the client is roaming, the L2 bridge forwarding table is configured to include a source MAC address of the client together with information identifying a destination interface for use in directing client data traffic back towards the subnet associated with the first network element.

Abstract: Disclosed is a multi-mode multi-band mobile communication terminal and a mode switching method thereof wherein a mode switching can be performed between an asynchronous network and a synchronous network by minimizing interruption in communication. According to the switching method of a multi-mode multi-band mobile communication terminal, the power of a signal received from an asynchronous network or a synchronous network is measured and the measured power of the received signal drives a modem portion, thereby switching the mode of the mobile communication terminal.

Abstract: A video streaming client (105) transmits an MIH_Get_Service_Quality.request which requests a report about service quality which is used in the video streaming client (105) at regular intervals to an MIHF (Media Independent Handover Function) (203). When the MIHF (203) acquires the MIH_Get_Service_Quality.request, on the basis of the communication quality of a radio link which is notified from a link control unit (205), the MIHF (203) calculates a prediction value of the service quality in the future in the regular intervals and notifies the video streaming client (105) of the calculated prediction value by an MIH_Get_Service_Quality.response.

Abstract: Tones within WiMAX signals are disabled to eliminate interference at third-party receivers. A level of interference is determined between a base station transmitting a WiMAX signal and a third-party receiver. The level of interference is determined based at least on a characteristic of the third-party receiver and the WiMAX signal. One or more tones within the WiMAX signal are determined to disable at the base station to eliminate the interference. The tones are disabled prior to transmitting the WiMAX signal by the base station.

Abstract: A method for base station reselection in a wireless communications system is disclosed. The method may determine a first indication of signal strength for a first signal sent from a first base station and received by a user equipment (UE). The method may also determine a second indication of signal strength for a second signal sent from a second base station and received by the UE. The method may further determine a relative signal strength based on the first indication of signal strength and the second indication of signal strength. The method may also determine a Q factor based on the relative signal strength. The Q factor may be an indication of when base station reselection should be performed.

Abstract: A method and user equipment for performing a handover between a MBSFN and non-MBSFN areas in a communication network is provided. The communication network comprises a first cell constituting a MBSFN area, a second cell constituting the non-MBSFN area, and a reserved cell between the first and second cells and subordinate to the MBSFN area. Reserved cell indication information being broadcast in the reserved cell. The method including: receiving the reserved cell indication information to learn that a user equipment is located in the reserved cell; measuring in the reserved cell, for a preset service, a first signal strength based on MBMS transmission and a second signal strength based on a single-cell transmission; and selecting the first or second cells as a target cell during a period in which a difference between the first and second signal strengths is lower than a preset threshold.

Abstract: The present invention relates to a transmit unit, a control unit and a method in a transmit unit comprising at least two antennas for transmitting signals relating to a plurality of radio channels. The transmit unit transmit signals relating to a first subset of channels from the first antenna and pilot signals from the first antenna for use a reference for the first subset of channels. The transmit unit is further arranged to transmit signals relating to a second subset of channels from the second antenna using single antenna transmission. The transmit unit also transmits pilot signals on a second type of pilot channel such as the S-CPICH, different from the first type of pilot channel, from the second antenna for use as a reference for the second subset of channels, wherein the first and second type of pilot channels are substantially covering the same area.

Abstract: A base station measures the uplink load on an uplink channel and controls the transmit timing of one or more mobile terminals on the uplink channel based on the measurements of the uplink load. The transmit timing of the mobile terminals may be controlled by sending timing control signals to the mobile terminals over a downlink control channel. In one embodiment, the transmit timing of the uplink channel is slaved to the transmit timing on a downlink channel. In this case, the uplink timing may be controlled by adjusting the downlink transmit timing.

Abstract: The present invention relates to an uplink synchronization request method in a mobile communication system, a CDMA allocation information element structure thereof, and an apparatus using the same. For this purpose the uplink synchronization request method includes: when uplink traffic is generated, determining whether an uplink synchronization error occurs; when the uplink synchronization error occurs, calculating a timing adjustment value; and transmitting a bandwidth request code including the calculated timing adjustment value to a base station and performing a bandwidth request. According to the present invention, the PSS compares a reference adjustment value and an arrival time of a downlink preamble to calculate uplink synchronization timing and synchronize an uplink of the PSS that requests bandwidth allocation through a bandwidth request ranging process to thereby maximize resource use efficiency in the uplink synchronization.

Abstract: A method and corresponding device are disclosed for varying setup mode based on reported latency at a target device. The target device or its serving network may report a latency characteristic associated with the target device, such as an indication of the air interface protocol and/or slot cycle being used by the target device, and an initiating device or communication server may use the reported latency as a basis to decide whether to operate in (i) a normal setup mode when setting up a communication session with the target device or (ii) an optimistic setup mode when setting up a communication session with the target device.

Abstract: Radio communication equipment performs radio communication with a first radio terminal group in a first period by using a frequency commonly for use by an adjacent base station, and with a second radio terminal group in a second period by using a frequency not commonly for use by the adjacent base station. The radio communication equipment includes a control unit to adjust time allocation of the first period and the second period; and a radio communication unit to perform radio communication with the first radio terminal group and the second radio terminal group according to the time allocation adjusted by the control unit.

Abstract: A method for providing precoding weights for data symbols of data control subframes includes generating a downlink frame having control subframes which individually correspond to one of a plurality of downlink data subframes, and inserting weight information into each of the control subframes, such that the weight information is to be applied to data symbols present in the corresponding one of the data subframes. The method further includes transmitting the control subframes and the inserted weight information to a receiving device.

Abstract: A base station includes a receiver receiving feedback information including a preferred weight determined by a user equipment (UE); a processor multiplying a weight and data to be transmitted; a transmitter including two antennas and transmitting the weight multiplied data to the UE through a specific physical downlink shared channel where a MIMO transmission scheme for a HS-DSCH (High Speed Downlink Shared Channel) is applied, the transmitter transmitting feed-forward information through a downlink shared control channel when the data is transmitted using the MIMO transmission scheme for the HS-DSCH, wherein the weight applied to the specific physical downlink shared channel is adjusted at a subframe boundary of the specific physical downlink shared channel and the feed-forward information is transmitted through a subframe of the downlink shared control channel corresponding to the specific subframe of the specific physical downlink shared channel.

Abstract: A method for direct mode channel access in a time division multiple access (TDMA) system includes: assigning a radio operating in the TDMA system to transmission on a first time slot of a direct mode channel; initiating a request for a direct mode transmission on the direct mode channel; determining, by the radio, whether there is communication activity present in the first time slot or a second time slot of the direct mode channel; aligning, by the radio, to a selected slot timing based on the determining step; and transmitting, by the radio, with the selected slot timing on the first time slot.

Abstract: The distance to a communicating party is detected using whether or not an electromagnetic-coupled RF field formation is achieved or not as simple measurement means. If the distance to the communicating party is short, i.e., if it is possible to form an RF field, then transmission power is reduced. As a result, power consumption is reduced. Since a reduction in transmission power is accompanied by restriction of the zone in which communication is possible, leakage of information is prevented and security is enhanced.

Abstract: A method and apparatus for handling a call using a wireless integrated access device that is compatible with Voice over ATM and Voice over DSL on a network side while being compatible with VoIP on a customer premise side are disclosed. For example, the present method employs a wireless integrated access device for receiving an incoming call from a broadband access network that uses dedicated connection switching. In turn, the method establishes a wireless connection for the incoming call with at least one VoIP enabled endpoint device located at a customer premise.

Abstract: Disclosed is a method for processing the service connection between a user terminal and a Wireless Local Area Network (WLAN) applicable to a WLAN interactive network that at least comprises: a WLAN user terminal, a WLAN access unit, a service control unit and a user information storage unit. The method comprises: setting flags that represent the attached or detached status of the service connection between the user terminal and the WLAN in the WLAN user terminal and the service control unit respectively; establishing or canceling the connection between the user terminal and the network through the interaction between the WLAN user terminal and the WLAN, meanwhile modifying the corresponding flags.

Abstract: To improve the delivery probability of a random access channel and increase the information amount notified on the random access channel. In a mobile communication system in which a mobile station apparatus and base station apparatus perform multicarrier communication with each other, the mobile station apparatus sets transmission control information about a random access channel based on a state of the mobile station apparatus in transmitting the random access channel, and the base station apparatus determines the state of the mobile station apparatus based on the transmission control information notified on the random access channel, and performs optimal scheduling corresponding to the state of the mobile station apparatus.

Abstract: A method and system is disclosed for setting up, modifying and tearing down an up-stream communication session in a basic service set (BSS) in a wireless local area network (WLAN), so that the communication session has a defined Quality of Service (QoS). Regarding setting up an up-stream communication session, a first Path message and a first Resv message (Path/Resv message) of a RSVP protocol are detected at a designated subnet bandwidth manager (DSBM) in a station having a point coordinator (PC). The first Resv message originates from a RSVP agent of a host outside the BSS, and is a request for setting up an up-stream session between a source non-PC station in the BSS and the PC station. A QoS parameter set and a classifier from the first Path/Resv message for the session are extracted at the DSBM. The DSBM determines whether to admit the up-stream session to the network based on the QoS parameter set defining the session and a channel status report on a medium access control (MAC) sublayer of the BSS.

Abstract: In a data transmission method of a wireless access point (WAP), the WAP determines whether a probe request frame transmitted from a mobile device is present in a wireless network. The WAP further transmits a beacon frame in response to the probe request frame when the probe request frame is present in the wireless network.

Abstract: A method performed by a network element for providing micro-mobility in a network to a mobile node including the steps of receiving a registration request message at the mobility anchor point from an access router that is currently coupled to the mobile node, wherein the registration request message includes an endpoint identifier of the mobile node and a local care-of address of the mobile node, establishing a label switch path (LSP) between the mobility anchor point and the access router, storing the endpoint identifier in a binding entry along with the local care-of address, a regional care-of address, the label switch path and an egress interface, advertising the endpoint identifier with associated regional or local care-of address of the mobile node, and forwarding data packets, received at the mobility anchor point from a corresponding node that have the regional or local care-of address, to the mobile node using the LSP.

Abstract: A wireless LAN device for performing wireless communication with another wireless device in a wireless communication system is disclosed. The wireless LAN device includes first and second communication sections which participate in a configuration process using a predetermined protocol. An execution section executes, based on an instruction received at a reception section, the configuration process by use of one of the first and second communication sections in cooperation with the another wireless device. An exclusion section performs, before the configuration process is completed, an exclusion process that excludes the other of the first and second communication sections from continuing to participate in the configuration process.

Abstract: A method includes receiving information flows between users into a basestation of a cellular network, applying a usage accountability framework responsive to predetermined user fairness metrics, bandwidth resources on the network and a history of channel bandwidth variations by the users, and executing bandwidth allocation for the flows between the users responsive to the applying an accountability framework for improving user experience on the network by the users.

Abstract: A method controls a wireless local area network, which includes a centralized performance management controller and a plurality of network elements. The method includes determining interference between each network element and every other network element of the plurality of network elements, and populating an interference matrix identifying the interference between each combination of two network elements of the plurality of network elements. The method also includes generating an adjacency matrix based on the interference matrix indicating each combination of the two network elements of the plurality of network elements that has an unacceptable level of interference. The method further includes improving overall performance of the wireless local area network by reducing the unacceptable levels of interference indicated by the adjacency matrix.

Abstract: In wireless OFDMA systems, sounding channels are allocated within predefined resource blocks. In a distributed sounding channel allocation scheme, a sounding channel is allocated to meet various design considerations. First, sounding signals do not collide with original pilots transmitted in the same resource block by other mobile stations to achieve good quality channel estimation. Second, sounding pattern does not affect data transmission behavior of other mobile stations in the same resource block. Third, sounding pattern consistency among multiple tiles within each resource block is maintained so that mobile stations do not need to implement additional data mapping rules. In a symbol-based sounding channel allocation scheme, a sounding channel is allocated in the first or the last OFDM symbol of a resource block, while the remaining consecutive OFDM symbols are used for data transmission. The symbol-based sound channel naturally satisfies all design considerations.

Abstract: Enhanced frequency division multiple access (EFDMA) is a multiplexing scheme that sends modulation symbols in the time domain and achieves a lower PAPR than OFDM. An EFDMA symbol occupies multiple subband groups that are spaced apart in a frequency band, with each subband group containing multiple adjacent subbands. To generate an EFDMA symbol, multiple modulation symbols are mapped onto a first sequence of symbols. A transform (e.g., a DFT) is performed on the first sequence to obtain a second sequence of values. The values in the second sequence corresponding to the subbands used for the EFDMA symbol are retained, and the remaining values are zeroed out to obtain a third sequence of values. An inverse transform (e.g., an IDFT) is performed on the third sequence to obtain a fourth sequence of samples. A phase ramp may be applied on the fourth sequence, and a cyclic prefix is appended to form the EFDMA symbol.

Abstract: A method and apparatus for transmitting paging control information in a wireless communication system are provided. A method of operating a Base Station (BS) for paging in a superframe-based wireless communication system includes determining a paging listening interval, determining an interval of at least one or more subframes before the paging listening interval, as a paging control listening interval, and, during the paging control listening interval, broadcasting a paging control message.

Abstract: Methods and apparatuses for versatile medium access control (MAC) multiplexing in evolved HSPA are disclosed. More particularly, methods for downlink optimization of the enhanced high speed MAC (MAC-ehs) entity and uplink optimization of the MAC-i/is entity are disclosed. Apparatuses for using the optimized downlink and uplink MAC entities are also disclosed.

Abstract: Apparatus and methods for managing operation information include determining a home network for a wireless device and receiving a call with a number identifying a calling party and a network identification identifying the network for the calling party. The apparatus and methods also include determining whether the received network identification corresponds to the home network for the wireless device. In addition, the apparatus and methods include displaying a notification based upon the determination; and accepting and/or rejecting the call based upon the notification.

Abstract: The present invention relates to a method for generating an uplink reference signal in a system supporting plural uplink-access transmission modes. The method comprises: a step for transmitting the reference signal configuration information about the configuration of a reference signal from a base station to a user device through an uplink grant PDCCH (Physical Downlink Control Channel), and a step for receiving from the user device a sub-frame including the reference signal that is generated based on the reference signal configuration information. The reference signal configuration information is prepared for plural uplink access transmission modes and includes a cyclic shift value for the sequence of the reference signal. The reference signal is supposed to be transmitted to an uplink, and the user device is set up to be operated in the uplink-access transmission mode that corresponding to the reference signal configuration information.

Abstract: The invention relates to a technique for performing a random access procedure over a radio interface, for example between a mobile terminal and a radio base station of a mobile network. A method aspect of the invention comprises the steps of transmitting a synchronization request for synchronization information; receiving synchronization information in response to the synchronization request; and transmitting, based on at least one transmission parameter adjusted in accordance with the synchronization information, a resource request for data transmission resources.

Abstract: The present invention relates to system nodes/entities and methods for enabling determination of the location of an attached User Equipment in a tunneled IP network. The User Equipment location can be determined by means of procedures maintained in a Location Function (LF). An application function can retrieve the User Equipment location by querying the Location Function by using the second source address as a key.

Abstract: A network device component receives traffic, determines whether the traffic is host bound traffic or non-host bound traffic, and classifies, based on a user-defined classification scheme, the traffic when the traffic is host bound traffic. The network device component also assigns, based on the classification, the classified host bound traffic to a queue associated with network device component for forwarding the classified host bound traffic to a host component of the network device.

Abstract: According to one aspect of the present invention, there is provided a SIP network element, for processing messages received from other SIP elements in a network of SIP elements, wherein the element is adapted for receiving a predetermined type of SIP request, the request comprising a plurality of headers and data associated with each of the headers, the element further comprising: a message search function adapted for extracting data from a predetermined selection of said headers, processing logic for processing the extracted data; means for creating a predetermined type of response message associated with the received request, the response message comprising data extracted from the received message; and means for sending the created message to a destination identified in the created response message.

Abstract: An operational mode of a terminal is dynamically configured to allow the terminal to receive services of interest to the terminal while potentially conserving battery power. The terminal operates in a first mode (e.g., an HRPD-only mode) and monitors only a first radio network (e.g., an HRPD network) for pages from a first data network (e.g., and IMS network) if all services from a second data network (e.g., an ANSI-41 network) of interest to the terminal is obtainable via the first radio network. The terminal operates in a second mode (e.g., an 1X-HRPD mode) and monitors the first radio network and a second radio network (e.g., a 1X network) for pages from the first and second data networks, respectively, if at least one service from the second data network of interest to the terminal is not obtainable via the first radio network. The terminal may dynamically select the first or second mode.

Abstract: An indirect communication system and a method of indirect communication include a mobile phone as either a calling device or receiving device. The mobile phone calls another device to set up a prospective communication, and then uses Voice over Internet Protocol (VoIP) to communicate with the other device over the Internet. The receiving device receives a generated signal notifying the receiving device of a proposed communication with the calling device. A server sets up a meeting point channel after the calling device has connected to the server. The server receives outgoing VoIP packets from the calling device and redirects the outgoing VoIP packets to the receiving device.

Abstract: The invention includes a method and apparatus for signaling proprietary information between network elements of a core network (CN) of a wireless communication network. A method for signaling proprietary information within the CN includes encoding the proprietary information in an IPv4 Options field of an inner header of an IP packet, and pre-pending an outer header to the IP packet for Mobile IPv4 (MIPv4) tunneling the IP packet from a first node of the CN to a second node of the CN. The first and second nodes of the CN may include a mobility anchor node and a mobility gateway node, respectively. The first and second nodes of the CN may include a mobility gateway node and a mobility anchor node, respectively.

Abstract: A method of processing a Voice over Internet Protocol (VoIP) call is disclosed. The method includes receiving a Uniform Resource Identifier (URI) associated with a destination telephone number from a telephone number mapping (ENUM) server associated with a third service provider. The method also includes receiving an Internet Protocol (IP) address of a Session Initiation Protocol (SIP) server associated with a second service provider in response to a query by a first service provider to a Domain Name Service (DNS) server. The query is based on the URI. Additionally, the method includes contacting the SIP server using the IP address of the SIP server to set up a bearer path of the VoIP call.