Patent ID: 6556672
Filing Date: 2003-04-29
Classification: H04M

Abstract:
A fault tolerance call processing system for connection to the public switched telephone network comprising:a plurality of client computers containing call processing applications; a plurality of voice processing resources required for processing calls; and at least two computer telephony servers for interfacing between said client computers and said voice processing resources, each of said servers containing one or more processors communicating with said call processing applications and said resources, each of said processors having one or more primary and/or standby functional components each of which carrying out a particular call processing function, each of said standby functional components beginning to work only when its counterpart primary functional component stops operating whereby a fault tolerance at the server level is achieved by shadowing between said primary functional components and their counterpart standby functional components; wherein each of said two servers contains at least one of said primary functional components and at least one of said standby functional components, and at least one of said primary functional components and its standby functional components are located in different servers.