Patent ID: 6430283
Filing Date: 2002-08-06
Classification: H04M,H04Q

Abstract:
Communication system composed of at least one first private branch exchange (PINX1) with an exchange controller (CC) and at least one first switching node (SW1) that is connected via a first network termination means (TU1) to at least one higher-ranking communication network (ISDN) and via at least one subscriber line means (SLM) to terminal equipment (TT1, TT2), and composed of at least one second private branch exchange with an exchange controller (CC) and at least one second switching node (SW2) that is connected via a second network termination means (TU2) to the higher-ranking communication network (ISDN) and via at least one subscriber line means (SLM) to terminal equipment (TT3, TT4), whereby a team function controller (TC) is provided in the first private branch exchange (PINX1), said team function controller controlling specific terminal equipment according to a team function as team terminal equipment of a team that can be called via the first switching node (SW1) and thereby initiating a signalling to other team terminal equipment dependent on the switching-oriented condition of individual team terminal equipment as well as influencing their switching-oriented condition, characterized in that at least one team terminal equipment (TT1, TT2) of the team is directly connected to the first switching node (SW1) as terminal equipment via a subscriber line means (SLM) and at least one second team terminal equipment (TT3, TT4), as detached member of the team, is connected to the second switching node (SW2) via a subscriber line means (SLM) and can be reached via the first switching node (SW1), a hot-line connection (HL) between the first and the second switching node (SW1, SW2) and the second switching node (SW2); and in that a team function sub-controller (TSC) is provided in the second private branch exchange (PINX2) in order to switch a call outgoing from the second team terminal equipment (TT3, TT4) into the higher-ranking communication network (ISDN) via the hot-line connection (HL) and the first switching node (SW1) and, given a malfunction of the first switching node (SW1) or of the hot-line connection (HL), in order to switch a call outgoing from the second team terminal equipment (TT3, TT4) via the network termination means (TU2) of the second private branch exchange.