Lucent Technologies Inc.

Thomas Edward Hudepohl

Robert T Calabrese

Robin Jeffrey Thompson

Todd Cartwright Morgan

Douglas Harvey Riley

The apparatus, method and system embodiments of the present invention provide for maintaining call control at a gateway mobile switching center (MSC), for roaming mobile units, utilizing a packet network or link, such as an ATM link. The preferred system embodiment includes a gateway MSC, a serving MSC, and a base station having a wireless link with the roaming mobile unit. The gateway MSC includes a protocol handler for voice (PHV). For any given incoming call for the roaming mobile unit or outgoing call from the roaming mobile unit, the gateway MSC designates a specific address (or channel) on the PHV, referred to as a data link connection identifier (DLCI), for use as an address for voice packets to be received from the roaming mobile unit via the base station and serving MSC, and the base station also provides a base station packet address to the gateway MSC, for use as an address for voice packets to be received from the gateway MSC (through the serving MSC) for the roaming mobile unit, thereby creating a full duplex packet link. The packet link serves as a voice path between the base station, the serving MSC, and gateway MSC, with all communication to and from the roaming mobile unit routed through the gateway MSC. The gateway MSC thereby maintains all call control for the roaming mobile unit for the implementation of advanced calling features, such as call waiting and three-way calling. In the preferred embodiment, the DLCI is included as a new parameter for ANSI-41 compatible messages. In addition, new ANSI-41 compatible messages are also utilized, a Gateway Origination Request containing the base station packet address and a Gateway Origination Request Return Result containing the new DLCI parameter.

Apparatus, method and system for maintaining call control at a gateway mobile switching center utilizing a packet network

A cellular system in accordance with the principles of the present invention permits one node, or network element, within a cellular system to request dialed number validation from another network element in the cellular system. The invoking and responding nodes may be any of the following: a mobile switching center, a home location register, a service control point, or a service node. Upon reaching a state in call processing where further dialed number analysis may be required, the invoking node will send an ANSI-41 compliant dialed number validation request message to the node performing validation. The validating node will determine whether the dialed number is allowed under the subscriber's dialing plan. After making the determination, the validating node will return a message to the invoking node indicating whether the specified digits are allowed according to the subscriber's dialing plan.

Growing community of inventors

Geneva, IL, United States of America

Thomas Edward Hudepohl