Patent Number: 6,490,451

Title: System and method for providing packet-switched telephony

Abstract: An improved method and system for providing packet-switched management of switching and handoff functions for a mobile terminal during call setup and user communication phases of a telecommunication session. A radio access network (RAN) including an air-interface base station in communication with the mobile terminal is in communicative contact with a packet-switched core network comprised of a plurality nodes which provide functionality that is equivalent to that of a network of Mobile Switching Centers (MSCs) and Visitor Location Registers (VLRs). A packet-switching backbone network provides communication transport facilities within the core network. Within the core network is a wireless access gateway (WAG) having media channels that provide an interface between the RAN and the core network. An Anchor Packet Gateway (APG) extends the bearer path from the WAG, and hides mobility between WAGs during the user communication phase. A wireless mobility server (WMS) in communicative contact with the WAG and APG serves as a media gateway controller for the WAG and APG, controlling connectivity of the media channels within the WAG and APG. A PSTN Trunking Media Gateway (PTMG) provides connectivity between the core network and the PSTN. A Call Server (CS) in communicative contact with the PTMG and WMS serves as a media gateway controller for the PTMG and WMS, where the WMS presents the appearance of a media gateway to the CS, but in fact functions as a media gateway controller for the WAG and APG. The CS and WMS together present the appearance of a single MSC/VLR to the public cellular or PCS network.

Inventors: Denman; Robert E. (Plano, TX), Jackson; Don L. (Murphy, TX), Hanley; Donald V. (McKinney, TX), Boudreaux; Paul H. (Garland, TX), Maxwell; Stewart H. (Dallas, TX)

Assignee: Nortel Networks Limited

International Classification: H04Q 7/22 (20060101); H04Q 7/38 (20060101); H04Q 007/20 (); H04Q 007/22 (); H04Q 007/24 ()

Expiration Date: 12/03/2019