Patent ID: 6141343
Filing Date: 2000-10-31
Classification: H04Q

Abstract:
An ISDN primary rate interface circuit, comprising:a plurality of communication channels;a control channel; anda channel division controller for private branch exchange having a plurality of extensions and being connected to at least one ISDN primary rate interface unit, said channel division controller including:a memory unit which stores selection information for determining conditions for using each of said plurality of communication channels, andmeans for selecting one of said plurality of communication channels as an originating communication channel based on an extension group number which generates a call and said selection information when a call is generated to said ISDN Primary rate interface unit from one of said plurality of extensions,wherein said selection information includes:extension number/extension group cross-reference information, wherein the extension generating the call and the extension group number to which said extension generating the call belongs are related to each other,extension group/channel group cross-reference information, wherein said extension group number and the channel group number are related to each other, andcommunication channel/channel group cross-reference information, wherein the channel group number and each of said plurality of communication channels are related to each other.