Redundant call processing

US6205557A · kind A · utility

Assignee

• AT&T CORP. · US

Inventors

• Koan S. Chong · East Brunswick Township, US
• Martin Dolly · Forked River, US
• Andrew R. Jacob · Waretown, US
• Carolyn Roche Johnson · Atlantic Highlands, US
• Wonseok Lee · Atlantic Highlands, US
• David Lewis · Howell, US
• Pamela M. Moricz · Aberdeen, US
• Mark A. Ratcliffe · Oakhurst, US

Key dates

• Filing date: Jun 9, 1998
• Grant date: Mar 20, 2001
• Expiry date: Jun 9, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q2213/13389
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A telecommunications network includes at least an active and a standby call server, the standby call server becoming active upon failure of the active call server. To facilitate rapid switch-over from the active to the standby call server and to prevent the loss of call processing data for calls in the call setup stage, the active call server sends call information to the standby call server during intervals in which the active call server is awaiting subsequent signaling messages from elements of the telecommunications network. In this way, the standby call server has the call information needed to commence call processing upon failure of the active call server, and the active call server makes efficient use of time while awaiting a reply signaling message.