Abstract: An interworking function (IWF) for a first and second protocol based network, for example, an H.323 protocol based network and an SIP protocol based network comprises an interworking gateway server including a state machine for defining each call processing state and a translation table for use in translating addresses formatted in each protocol.

Abstract: The present invention relates to a method and apparatus for inter-domain mobility management for a telephony network. The present invention also relates generally to the H.323 standard for transmitting audio and video data streams, and more particularly to extending the H.323 standard to support mobility in a multimedia communication system with services over packet-based networks.

Abstract: Method and system are disclosed for intercepting voice/multimedia calls in a VPN environment. The calls are diverted to a voice/multimedia call intercepting server where the intercept subject is identified. The identification may be based on an image/picture as well as identifying information about the intercept subject provided to the VPN administrator. The identifying information may be, for example, a telephone number, URL, name, and the like, for the intercept subject. The combination of image/picture and identifying information is especially useful to confirm telephone numbers, URLs, names, and the like that can be used by someone other than real intercept subject. Once the identity of the intercept subject is confirmed, the call content is duplicated, encapsulated, and/or transported to the law enforcement agency. The method and system of the invention then re originates the call to prevent the intercept subject from detecting the intercept.

Abstract: A decomposed H.323 border element is disclosed that is useful for providing an entry point from one or more H.323-based networks into a SIP-based VoIP network. In one embodiment, the signaling element of the BE is separated into a separate functional entity from the media control element to facilitate a single signaling entity controlling multiple media entities. In another embodiment, the security element of the border element is also separated from the media control element so that firewall and network address translation elements may be performed by a separate functional entity. In a further embodiment, the media transcoding element is separated from the media control element. In a final embodiment, the internetworking facility between the SIP and H.323 element is separate from the H.323 gatekeeper elements.