At+t Corp.

Andrew R Jacob

Mark A Ratcliffe

Martin Christopher Dolly

Koan Seng Chong

David George Lewis

Carolyn R Johnson

Pamela M Moricz

Wonseok Lee

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.

Redundant call processing

Growing community of inventors

Ocean, NJ, United States of America

Andrew R Jacob