UMTS telecommunications system for enabling a mobile station to receive voice-over internet protocol calls when roaming

Patent 7301934 Issued on November 27, 2007. Estimated Expiration Date:

April 18, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Data packet radio service with enhanced mobility management
Patent #: 6104929
Issued on: 08/15/2000
Inventor: Josse, et al.

Short message service support over a packet-switched telephony network
Patent #: 6611516
Issued on: 08/26/2003
Inventor: Pirkola , et al.

Method and system for bearer management in a third generation mobile telecommunications system
Patent #: 6690679
Issued on: 02/10/2004
Inventor: Turunen , et al.

Method and apparatus for integrated wireless communications in private and public network environments
Patent #: 6807431
Issued on: 10/19/2004
Inventor: Sayers, et al.

Method and device for performing a packet data communication Patent #: 7023855
Issued on: 04/04/2006
Inventor: Haumont, et al.

Inventors

Assignee

Lucent Technologies Inc.

Application

No. 10030387 filed on 04/18/2000

US Classes:

370/352, Combined circuit switching and packet switching455/432.1, Roaming455/436, Handoff455/445, Call routing (e.g., to prevent backhaul, routing efficiency, least cost, or alternate routing)370/469, Processing multiple layer protocols455/555, Wireless private branch exchange (PBX) (i.e., wireless link to extension unit)370/395.1, Message transmitted using fixed length packets (e.g., ATM cells)370/328, Having a plurality of contiguous regions served by respective fixed stations370/329, Channel assignment455/439Handoff initiated by another source (e.g., target, user initiated, mobile switching center (MSC), or mobile telephone switching office (MTSO), etc.)

Examiners

Primary: Pham, Chi
Assistant: Chou, Albert T.

Foreign Patent References

WO 99/05830 WO 02/01/1999
WO 99/16266 WO 04/01/1999

International Class

H04L 12/66

Abstract

A telecommunication system including a mobile station, and means for a mobile station to receive voice-over Internet Protocol (VoIP) calls when it is roaming away from a home network, comprising: means for informing a serving GGSN of the International Mobile subscriber Identity (IMSI) of the called mobile station, and means for enabling a local VoIP control server to map a called MSISDN number to the IMSI number.