Abstract: Method and apparatus for unified messaging is described. More particularly, a visual or audible indication is provided to a served party that one or more messages are waiting on a network based centralized mail accumulation system. These messages may be voicemail, e-mail, fax mail, data mail, video mail, videoconference mail, picture mail, and the like, including without limitation any combination thereof. This notification is accomplished in part through use of an application running on a mail accumulation system or on an adjunct computer serving multiple mail accumulation systems. This application may be operatively coupled to customer premises' equipment and a message waiting indicator device. This coupling may be achieved using telephone wiring.

Abstract: In one embodiment, the system includes a processor (referred to herein as a tandem access controller) connected to the PSTN which would allow anyone to directly provision, that is to say set-up and make immediate changes to, the configuration of his or her phone line. In another embodiment, a tandem access controller (TAC) subsystem is connected internally to the PSTN in a local service area. The TAC provides features, selected by the subscriber, to all edge switches connected to the PSTN tandem switch. In one embodiment, the TAC is controlled by the subscriber using the web.

Abstract: A telecommunications system (18) comprises a control node (24) and a base station node (22). The control node (24) maintains a first list (42) of idle radio channels which is consulted in order to obtain channels for a first type of telecommunications service. A second list (56) of idle radio channels is maintained for a specialized telecommunications service, the idle radio channels of the second list being radio channels which are unallocated with respect to the specialized telecommunications service but yet activated (e.g., having an established transmission path and synchronization). The second list of idle radio channels is initially consulted in order to obtain channels for the specialized telecommunications service. If no channels are available for the specialized telecommunications service on the second list, idle channels from the first list are adapted and utilized for the specialized telecommunications service. The specialized telecommunications service preferably involves packet data transfer (e.

Abstract: A quality of service guarantee for voice and other delay sensitive transmissions within an Internet Protocol (IP) network is provided by identifying the IP network path utilized for IP packet transmission between source and destination edge devices and virtually provisioning IP network path bandwidth for priority voice traffic. Priority for voice packets and admission control of new voice calls (and other delay sensitive traffic) based on the remaining available capacity over the IP network path guarantees that high priority voice (and other delay sensitive traffic) meet stringent delay requirements. A Virtual Provisioning Server is utilized to maintain bandwidth capacity data for each path segment within the IP network and to forward the bandwidth capacity data to a Signaling Gateway. The Signaling Gateway determines whether to accept or reject an additional delay sensitive traffic component based upon available bandwidth capacity for an IP network path.

Abstract: Applications running on a mobile station or an external network entity such as an Internet service provider may specify on an individual application flow basis a requested quality of service. From that requested quality of service, an optimal type of bearer to transfer the application flow through the mobile communications network is determined. For example, a circuit-switched bearer may be allocated if the request is for a real-time service, and a packet-switched bearer may be allocated if the request is for a non-real time type of service. Various other decision making criteria may be employed. A mobile station and a mobile network gateway node each include a mapper for mapping an individual application flow to one of a circuit-switched network and a packet-switched network bearer depending on the quality of service requested for the individual application flow.

Abstract: An architecture and method for permitting internet telephones assigned to a common telephone number but each having a unique IP address to be used in the manner of telephones and extension telephones in PSTN. A calling agent is provided with the fully defined address of two or more telephony devices. Telephone traffic to or from either of these devices is directed to a call agent, which contacts a gateway, which rings one or both of the telephony devices. This gateway then forms a bridge with a secondary gateway, to which are attached the other telephony devices that are to act as extensions of the first, and combines the audio from both so that they appear to the consumer to act like conventional PSTN extension telephones. This architecture can be used with any Internet Protocol telephony device, including video telephones.

Abstract: An architecture and method for providing voice over internet telephony with data processing intensive features that would otherwise not be economical to provide to subscribers. A dial server is centrally located and receives audio from a consumer's telephone. The audio signal, which may be voice or dial tones, is processed by the dial server, which associates the information in the audio signal with a telephone number, which is passed to a gateway and thence to a call agent for further routing.

Abstract: Methods, systems and computer program products are provided for accessing an embedded web server of a broadband access terminal by monitoring communications on at least one of a wide area network connection and a local area network connection of the broadband access terminal so as to determine a domain name server and/or a network gateway associated with the wide area network and accessed by a user terminal using the broadband access terminal. When the wide area network connection of the broadband access terminal is detected as unavailable, the broadband access terminal responds to communications from the user terminal to the domain server and/or the network gateway as if the domain name server and/or network gateway are accessible over the wide area network.

Abstract: A telephone number domain name system is provided for managing a telephone number system using an existing domain name system thereby allowing a telephone number to be unique worldwide. The system includes a telephone number domain name system client and telephone number domain name server. The telephone domain name client includes a telephone number input section for receiving a telephone number, a domain name conversion section for converting the telephone number into a domain name, and an address request section for requesting an Internet protocol (IP) address corresponding to the converted domain name. The telephone number domain name server includes an address search section for searching an Internet protocol (IP) address corresponding to the request, and an address response section for transmitting a searched Internet protocol address to the address request section.

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. When the switch receives a request for change of switching, it does not processes that request at once, but confirms that the cell located at the boundary of the frame has been processed, before processing the change request, so as to protect the frame. When the switch receives a request for change of switching, it protects a frame by multicasting the cells to both destinations before change and after change, for a given period of time.

Abstract: A method and an apparatus solve the problem of how to be able to charge for an outgoing voice call placed by a subscriber who is simultaneously performing an internet session. The problem is solved by creating a table and associating the IP-address, which ordered the call, with the duration and the destination of the call.

Abstract: A system for permitting a first party to initiate a call from a second party to the first party, comprising a network for providing communication between the first party and the second party; web server connected to the network for storing at least one web page associated with the first party containing a first embedded computer program for creating a voice communication path terminating at a location defined by a predetermined Call Value; a first computer connected to the network for sending at least one message from the first party to the second party requesting the call, wherein the at least one message contains a second embedded computer program for allowing the second party to access the at least one web page; mail server connected to the network for storing the at least one message; a second computer connected to the network for retrieving the at least one message from the mail server and in response accessing the at least one web page by execution of the second embedded computer program and executing t

Abstract: A knowledge based system uses a protocol analyzer which acquires real time statistical data on network signal traffic in a monitoring session and reports a session performance history as a real time composite of measured statistics and analysis-derived statistics, together with a real time report of discarded frames.

Abstract: Method and system integrating wireless/wireline and circuit/packet networks (to bypass GSM Memorandum of Understandings) for cellular/PCS services so that GSM subscribers roaming into CDMA networks can be provided with basic call delivery cellular services as long as the roamers can pay the bill with their valid credit card. This is achieved by integrating wireless and wireline networks as well as circuit and packet networks, using IP networks and protocols as an alternative to the existing telephony-based approach.

Abstract: A system for enabling music to be provided to callers placed on hold in a LAN network used for voice communications. Bandwidth consumption is minimized by ensuring that music-on-hold is provided in a manner that enables most necessary tasks to be executed by a client instead of a server. In specific embodiment, the music-on-hold system is configured to transfer a small application program or applet, having a music file and a media player, from the server to the client if necessary. Concurrently, a real time protocol (RTP) stream carrying music is used to provide music to the client from the server during the applet transfer to ensure that the held caller receives music at all times. The RTP stream is initially used to provide music to held callers.

Abstract: Customer premises equipment (11B) connected to a telephone line (13B), is arranged to be woken up remotely and then to initiate communication with a network-based service system. (20). In order to avoid the cost involved in having a dedicated phone line for the equipment, the equipment (11B) needs to be able to be woken up in a selective manner that does not have significant impact on the operation of other apparatus that may be connected to the same phone line (13B). Several different techniques are provided for waking up the equipment (11B) and initiating communication with the service system (20). In one embodiment, equipment wakeup is effected by a call with particular characteristics, the equipment (11B) once woken up calling a network access point (18) to establish communication with the service system (20). In another embodiment, a wakeup call is placed via a network access point (18) and the equipment picks up the call and uses it to establish network access.

Abstract: A gateway for communicating telecommunication information between a telecommunication network and customer premises equipment includes a telecommunication interface and a packetization module. The telecommunication interface receives first telecommunication information for a first subscriber and second telecommunication information for a second subscriber.

Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of the network elements.

Abstract: A service provider providing gatekeeper backup services to a plurality of off-site voice packet networks from a single central backup gatekeeper. The gatekeeper maintains a database of local gatekeepers for which the backup service is to be provided. The services provided may be identical to those provided by the corresponding local gatekeeper, or may be a more basic level of service to reduce the cost of the backup service.

Abstract: A method for providing an animated audio message includes wirelessly receiving indicia of an audio message and an image, and animating the image in association with the audio message to produce an animated audio message. A system for providing animated audio messages includes a wireless interface that can receive wireless communications that provide or identify an audio message and provide or identify an image. An animator is coupled to the wireless interface and can animate the image in accordance with the audio message to form an animated audio message. An animation interface is coupled to the animator and can transfer the animated audio message from the animator toward a desired destination.

Abstract: A method of and system for determining an ability of a first device to use an optical trail to communicate across an optical transport network with one or more other devices. The first device and the one or more other devices are external to the optical transport network. A first signal is transmitted from the first device, where the first signal indicates that at least a first port of the first device is available to be an endpoint for an optical trail across the optical transport network. The first signal is received at a first transport network device of the optical transport network. A second signal is transmitted from the first transport network device, where the second signal identifies a second port of a second transport network device included in the optical transport network to which the first device can send signals corresponding to an optical trail. The second signal is received at the first device.

Abstract: A packet switched network is comprised of a communications network, such as the existing IP network, and a number of distributed protocol converters connected to the IP network. X.25 user data terminals are connected to the protocol converters. Each protocol converter serves as an interface between the user data terminals and the IP network by performing protocol conversion between TCP/IP protocol and X.25 protocol.

Abstract: A proxy at the interface between a wireless communications system and a packet network intercepts all traffic between the wireless communications systems and the packet network and re-formats the intercepted traffic according to an optimal maximum transmission unit size between the interception point and the final destination, excluding the wireless link from computation of the optimal maximum transmission unit size. Typically this will result in packets from the wireless communications system being aggregated into a larger maximum transmission unit size, while packets from the packet network are fragmented into a smaller maximum transmission unit size. Congestion at intermediate nodes within the packet network is reduced, while end-to-end bandwidth utilization and latency at the final destination are improved.

Abstract: The invention relates to a method for transferring a call between a telecommunications network and a data network. Between the data network and the telecommunications network an internetwork computer (gateway) is arranged, by which voice data of the call is converted from a format used in the telecommunications network into a format used in the data network, and conversely. Signaling data of the call is processed by a data processing device arranged in the data network. In order to make full use of the available functions of a signaling channel in telecommunications networks, even with voice connections that are partially over a data network, it is proposed that the signaling data be transferred bit-transparently between the gateway and the data processing device.

Abstract: Broadband integrated services are performed via digital, channelized or optically coded networks by a system which organizes, interfaces, provisions, loads and controls, in real time, the transport of grouped or organized information (such as packetized cell data) through interface access devices and packet switches that are compliant with domestic and international communication standards. A packet core network includes multiple packet switches and interface access devices coupled to an existing narrowband or broadband network. A signaling manager, a provisioning manager and a traffic manager perform all broadband and narrowband routing, port provisioning and connecting functions for all network devices. A set of software interface modules for each equipment vendor allows the provisioning manager, the signaling manager and the traffic manager to impose control demands and make network management decisions on a real time basis via an application protocol interface.

Abstract: A fixed wireless point-to-multipoint distribution network for providing seamless communication coverage to plurality of subscribers that includes a plurality of base stations for providing wireless access to said subscriber; each base station having connectivity to one another on a first network layer via at least one of a number of IP and/or ATM switches, called IDCN switches; each IDCN switch having connectivity to another over a second network layer via a transport ring thereby enabling one user to communicate directly with another user in said first network layer, or externally of said first network layer via one of said IDCN switches. An integrated data centric network is provided that integrates voice, data and video services into a single network, defines user services by the end user by providing middleware to enable the end user to develop services and applications; and provides a carrier grade service with distributed networking and services.

Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the single-sideband modulated header and data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of the network elements.

Abstract: A computer telephony integration (CTI) system is capable of supporting one-to-one and multiparty communications.

Abstract: The present invention relates to a method and an arrangement and an apparatus for implementing and monitoring a call in a telecommunications system in which the call is routed from a first transceiver to a second transceiver via a first switching center and a second subsequent switching center. In the solution a call setup message from the first switching center to the second switching center includes an address of said first switching center, the call setup message is intercepted at a telecommunications node intermediate to the first and second switching centers, whereafter the address of the first switching center is replaced with an address of the intermediate node.

Abstract: A control method for a web phone includes: a) determining all possible operating states of the web phone, and transition conditions that control transition from one of the operating states to another of the operating states; b) performing state analysis for the operating states in accordance with the transition conditions to generate a state transition table; c) determining a logical function in canonical sum-of-products form for each bit of an n-bit number that is used to represent the operating states from the state transition table; and d) implementing a finite state machine in accordance with simplified equivalents of the logical functions thus obtained such that the finite state machine can control transition of the web phone from one of the operating states to another of the operating states in accordance with current values of the transition conditions. A control apparatus including the finite state machine is also disclosed.

Abstract: An OSI tunnel routing method is provided, in which an IP packet which is encapsulated in an OSI packet is transmitted between transmission apparatuses in an OSI network each connected to an IP network. The transmission apparatuses exchange reachable IP network addresses and each own OSI network address, each of the transmission apparatuses generates an OSI tunnel table which includes the OSI network addresses and the reachable IP network addresses, and a first transmission apparatus which receives an request to access an IP address determines a second transmission apparatus which can transfer data for the IP address by referring to the OSI tunnel table, and generates an OSI tunnel between the first transmission apparatus and the second transmission apparatus.

Abstract: A method and system for performing a route lookup in a routing system, including a plurality of routes places a bound on the number of accesses to the memory necessary to perform a route lookup and guarantees the minimal amount of memory to achieve a particular bound. For each node the memory required to meet a bound on the depth of the tree rooted at that node is computed, given the distribution of routes in the network.

Abstract: A system and method that provides for an exchange of messages and associated data across a plurality of communication network system entities for one or more communications networks, wherein the system includes one or more distributed message brokers which are in communication with any number of communication network system entities. The message broker may perform message processing, which includes relaying and screening based on prioritization rules which may include customer classification criteria, associated service classification, and system entity classification applied to a message classification for messages communicated over the communications networks.

Abstract: A call management messaging system enables the integration of the Internet with the Public Switched Telephone Network PSTN in a manner such that systems, services, and devices on either can communicate with systems, services, and devices on the other. The full benefit and unique characteristics of either network are thereby made available to these communications. Call management messages include call setup requests, call acceptance, call rejection for busy, call forwarding, and similar messages necessary for creating and disconnecting voice and multimedia communications across the PSTN or the Internet. Devices on both the Internet and the PSTN have messaging addresses, and are associated with the call management messaging system. A device creates an Internet communication with another device by dialing its telephone number.

Abstract: Providing Voice Over Internet Protocol (VOIP) networks includes attempting to authorize a call from a user made to a number, routing the call, after the call is authorized, to a remote location, and setting up call signaling at the remote location between the user and a destination of the call so that media content of the call flows between the user and the destination but not through the remote location.

Abstract: A system and method for providing symmetrical connectivity between at least two consumer premises equipment (CPE) telecommunications devices is provided. At least two consumer premises equipment telecommunications devices are operatively connected over an asynchronous transfer mode telecommunications network. The at least two consumer premises equipment telecommunications devices are configured to perform local tone generation, local tone detection and decoding, and direct transfer and decoding of dialed digits using channel associated signaling secondary service packets and dialed digit packets to transition between various states. By providing symmetrical connectivity of CPE devices, central office involvement may be eliminated.

Abstract: Methods and apparatus for implementing a wireless modem that operates in two or more wireless networks, such as a packet switched network and a circuit switched network. In one implementation, a modem includes: at least one antenna; a plurality of air interface components, where each air interface component is connected to an antenna and each air interface component corresponds to a respective wireless network, where at least one wireless network is a packet switched network; a modem control component, where the modem control is connected to each of the air interface components; and a modem interface, where the modem interface is connected to the modem control component.

Abstract: A method for establishing a connection from a network-internal terminal of a communication network, the network-internal connections of which are managed by a connection controller, to a network-external connection destination, wherein the connection is established via a gateway device which is registered in the connection controller under the logical address of the network-external connection destination, and on the basis of the logical destination address, the connection controller establishes a network-internal connection from the terminal to the gateway device, and in the gateway device itself, a network-externally valid transport address is assigned to the logical destination address, on the basis of which transport address the connection is relayed to the network-external connection destination.

Abstract: According to the invention, in an apparatus which can perform a data communication through a plurality of networks such as internet, public telephone network, and the like, an optimum network to perform the data communication is automatically selected in accordance with communicating conditions such as a communicating mode and the like, thereby enabling a data communication via the selected optimum network to be executed.

Abstract: A system and method of PSTN based network roaming and SCP based subscriber management for internet telephony systems. When a call is incoming to the central office 60 of a subscriber's home service area which supports packet data network telephony 10, such as for instance IP telephony, a home location register 40 translates the directory number into an IP address, URL address, or electronic mail address much the same that a local number portability node re-routes calls for non-IP telephony systems. When a subscriber is roaming in another network 100, the roamed into (visited) gateway 130 signals back to the home location register 40 of the subscriber's network 20 and registers its (i.e., the visited gateway's) public switching telephone network 70 telephone directory number and the IP address assigned to the subscriber while connected to the visited network 100.

Abstract: An internet telephone system uses a Public Switched Telephone Network (PSTN). An internet network is coupled to the PSTN. At least two telephone stations are part of the system wherein one of the at least two telephone stations is a DSL telephone station which is coupled to the PSTN. The DSL telephone station has a Plain Old Telephone Set (POTS) splitter coupled to the PSTN for directing low frequency signals to a first line and DSL signals to a second line. A DSL line interface is coupled to the POTS splitter for driving and terminating the second line. A DSL transmitter is coupled to the DSL line interface. A DSL receiver is also coupled to the DSL line interface. A Digital Signal Processor (DSP) is coupled to the DSL transmitter and the DSL receiver. A telephone interface is coupled to the first line. An audio transceiver device is coupled to the telephone interface. A CODEC circuit is also coupled to the telephone interface. A ring and hook detect/control circuitry is coupled to the DSP.

Abstract: A system verifies and validates PSTN to IP Network services prior to the availability of the services to a plurality of subscribers. A PSTN call generator services a plurality of callers coupled to the PSTN and to a test database. An IP client simulator is coupled to the test database and to an IP Network. A data bus couples the PSTN and the IP Network to a registration server for registering the client and a heartbeat server for tracking the system for heartbeat message. An application server processes test service calls from the PSTN call generator whereby PSTN-IP Network services can be executed for all clients or individual clients as represented by the IP Client simulator for verification and validation of PSTN services to IP Network clients prior to the availability of the services to the clients.

Abstract: An interworking unit (14) for providing an interface between a digital communication network (12) and a public switched telephone network (PSTN) (16) includes a de-vocoder (30), a protocol termination unit (32), and a signal combiner (34) for processing signals being transferred from the digital network (12) to the PSTN (16). A digital communication signal received by the interworking unit (14) from the digital network (12) is processed by both the de-vocoder (30) and the protocol termination unit (32). The outputs of the de-vocoder (30) and the protocol termination unit (32) are then combined into a uniquely formatted signal that is then delivered into the PSTN (12). Similar functionality is also provided for processing signals in the reverse direction. The interworking unit 14 is capable of processing signals traversing the interface between the networks (12, 16) without a priori knowledge of the signal type being processed.

Abstract: Communication networks and network nodes for carrying packet data traffic have architectures that give large freedom in network topology and simplify network extensions, accompanied by a lightweight but robust protocol. A network may be a cellular network that handles packet data traffic and voice traffic. Location information relating to terminals in a network may be determined through terminal-originated packets or control messaging. Stored location information may be cleared by elapse of time or specific messaging. Location information for different kinds of terminals may be stored in a centralized or distributed database.

Abstract: An apparatus and method for interconnecting a private exchange to the Internet. A card allocated with an intrinsic Ethernet address is included in a private exchange. The private exchange is allocated with an Internet protocol (IP) address corresponding to the Ethernet address from a maintenance administration personal computer to which the private exchange is connected via an Ethernet network. By this IP address, the private exchange is interconnected to the Internet. In accordance with the present invention, therefore, the private exchange utilizes both the public network and Internet by virtue of the IP address allocated thereto.

Abstract: A wireless data transport method, and a mobile terminal and an interworking function (IWF) device therefor. In the wireless data transport method performed using a mobile terminal, an IWF device and a server, a dialing is performed in the mobile terminal using a predetermined command with an identifier including an IP (Internet Protocol) address, and then RLP (Radio Link Protocol) between the mobile terminal and the IWF device is synchronized to establish a circuit-switched data (CSD) channel according to the command. Then, PPP (Point-to-Point Protocol)/TCP (Transmission Control Protocol) is performed in the IWF device according to the identifier, and a network interface channel is then opened by an AT (ATtention) processing unit of the IWF device according to the IP address of the identifier. Therefore, the mobile terminal can be connected directly to a network interface which is an Internet connect port, using a CSD channel which is preferred by network service providers, not using a modem.

Abstract: A method and system of providing a remote user with access to a voice response unit, which allows Internet users to access voice response units using a web graphical interface. In one aspect, the present invention includes an Internet telephone services node, which includes a web server communicatively coupled to a client computer system of the remote user, a voice switch initiating a call to a voice response unit, responsive to a signal from the web server, a touch-tone generator generating a touch-tone signal, responsive to a signal from the web server, and transmitting the touch-tone signal to the voice response unit through the voice switch and an audio streaming server receiving an audio signal from the voice response unit through the voice switch, digitizing the audio signal and transmitting the digitized audio signal to the client computer system through the web server.

Abstract: An Internet Protocol (IP) telephony system manages Gatekeeper subscriber load by assigning subscriber load among a plurality of Gatekeepers during the Gatekeeper discovery and registration process. A Registration Load Management Unit (RLMU) is primarily responsible for assigning subscriber load to the plurality of Gatekeepers. In one embodiment, the plurality of Gatekeepers are organized without a hierarchy structure and are made up of a plurality of Gatekeeper service nodes and a plurality of Gatekeeper Database nodes. The Gatekeeper service nodes provide the Registration, Admission, Status, Location, Call Set Up and other operating functions of the Gatekeeper while the plurality of Gatekeeper Database nodes store subscriber information. In a second embodiment, the plurality of Gatekeepers are organized in a hierarchy with a Root Gatekeeper at the top of the hierarchy and a plurality of Gatekeepers residing below the Root Gatekeeper in the hierarchy.

Abstract: Architecture for processing routing information in a data network. A set of routing information entries is provided in a routing database of a first storage location. A subset of the routing information entries is created in a second storage location, which subset of the routing information entries are in the structure of an IP tree. Packet routing information of an incoming packet is extracted, which packet routing information includes multiple byte parts. The second storage location is accessed to compare the multiple byte parts of the packet routing information sequentially with respective entries of the subset of routing information entries to determine forwarding information. The subset of routing information in the second location is adjusted dynamically in response to the availability of the packet routing information in the subset of routing information entries.

Abstract: A communication system includes User Equipment (111), Radio Access Network (RAN) (121), a packet-switched domain (131), an IP Multimedia Subsystem (IMS) (141), a circuit-switched domain (151), a Domain Name System (DNS) (165), a Charging Gateway Function (CGF) (134), an EIR (135), a Transport Signaling Gateway (T-SGW) (146), and a Roaming Signaling Gateway (R-SGW) (147). The CS domain (151) includes an interworking Mobile Switching Center (iMSC) (201). The iMSC (201) translates the CS domain registration, call control, feature control, and feature invocation procedures associated with the access technology to standard SIP procedures. The media gateway (MGW) (173) under the control of the iMSC (201) converts the air interface media flow into a packet stream that is managed by SIP procedures within the IMS (141). The iMSC (201) thereby allows for interworking between circuit-switched and packet-switched domains for call terminations.