Paylun Ju

US Patent:

20040240430, Dec 2, 2004

Filed:

May 27, 2003

Appl. No.:

10/445998

Inventors:

Nan-Sheng Lin - Fremont CA, US
Chih-Ping Lee - Cupertino CA, US
Shih-An Cheng - Milpitas CA, US
Paylun Ju - Cupertino CA, US

Assignee:

Innomedia Pte Ltd. - The Alpha

International Classification:

H04L012/66

US Classification:

370/352000

Abstract:

An IP telephony gateway operates in conjunction with a base station of a hybrid micro cellular wireless telephone network. The base station supports roaming of a wireless telephone into a cell controlled by the base station. The IP telephony gateway comprises: i) a circuit switched network interface for exchanging system messaging, call signaling, and audio media with a circuit switched system controller; ii) a base station network interface for exchanging system messaging, call signaling, and audio media with a base station; and iii) a VoIP client for exchanging system messaging, call signaling and audio media with a remote VoIP device over a packet switched network. A management module interfaces messages exchanged with the base station and each of the circuit switched system controller and the soft switch to support roaming of the wireless telephone into the cell controlled by the base station.