Abstract: A system is provide for extending services to cellular devices. The system includes a wireless gateway having a client side with an intelligent client agent and a server side with an intelligent server agent, a wireless device having a first mode operable in a cellular system and a second mode operable in a wireless local area network and including an intelligent client agent for determining operation mode and for communicating with the intelligent client agent of the wireless gateway and a communications protocol for communication between the wireless gateway intelligent client agent and the wireless device intelligent client agent to effect services. The services include one or more of voice, directory, presence, and media services. The voice service includes at least one of call waiting, call forwarding conferencing, and caller identification. The media service includes at least one of interactive voice response (IVR), text-to-speech, speech recognition, play, record.

Abstract: A multi-network environment comprises a plurality of different digital networks, a network manager associated with each network, a system manager at each customer premises for requesting a desired service, a customer agent for implementing instructions received from the customer agent, and a call processing unit associated with each network for implementing instructions received from a customer agent to route a call through the networks.

Abstract: An integrated network management system for multiple networks of different topology domains employs hierarchical pass-through routing and multi-network service management through the network.

Abstract: A communication system for implementing remote operations between a PABX and a host computer, conforming to Open Systems Interconnect (OSI) communication protocol. Circuitry is provided in each of the PABX and host computer for generating and encoding invoke, return result, error and reject operation protocol data unit signals, for transmission between application layer entities of the PABX and host computer. In order to support invoking of asynchronous telephony operations, invoke address and server address fields are incorporated within the argument sequence and the result sequence of the invoke and return result operation protocol data unit signals, respectively.