Patent ID: 6047058
Filing Date: 2000-04-04
Classification: H04M

Abstract:
A communication system, comprising:at least one higher-level communication network;first and second team terminals;at least one first private branch exchange including a call controller, at least one first switching node, a first network interface unit connecting said at least one first switching node to said at least one higher-level communication network, at least one subscriber line module connecting said at least one first switching node to said first team terminals, and a team function controller controlling certain of said Terminals, in accordance with a team function, as team terminals of a team to be called through said first switching node, For initiating signaling to other team terminals and influencing their call-processing state in dependence on a call-processing state of individual team terminals;at least one second private branch exchange including a call controller, at least one second switching node, a second network interface unit connecting said at least one second switching node to said higher-level communication network, at least one subscriber line module connecting said at least one second switching node to said second team terminals, and a team function subcontroller;a hot-line link connected between said first and second switching nodes;at least one of said first team terminals connected directly to said first switching node as a terminal through said subscriber line module;at least one of said second team terminals connected to said second switching node, as a remote subscriber of said second switching node, through said subscriber line module, and to be reached through said first switching node, said hot-line link and said second switching node;incoming calls to at least one of said first and second team terminals reaching said team function controller directly through said first network interface unit and through said second network interface unit and a call diversion function of said second private branch exchange; andsaid team function subcontroller in said second private branch exchange canceling said call diversion and performing a local team function sequence control upon detecting a disturbance in said hot-line link to said first private branch exchange.