Patent ID: 9001974
Filing Date: 2015-04-07
Classification: H04M

Abstract:
1. A telephone on-hook/off-hook state communication system comprising: a first part operable to interconnect between a telephone apparatus and a pair of conductors; a second part operable to interconnect between the pair of conductors and a telephone adapter unit; and a reverse power feed arrangement for transmitting power over the pair of conductors from a user's premises to an item of equipment located within a part of a packet based access network external to the user's premises, the first part including a variable impedance and means for changing the impedance of the variable impedance such that a property of the impedance at a predetermined frequency greater than zero changes in response to the telephone apparatus transitioning between an on-hook state and an off-hook state, the second part including a detector for detecting the change in the impedance of the variable impedance of the first part via the pair of conductors, wherein the second part is incorporated into the same device as the telephone adapter unit, the telephone adapter unit being operable to convert Plain Old Telephone Service signals to and from Voice over Internet Protocol signals for transmission over and reception from the access network wherein the second part is operable to interconnect between the pair of conductors and the telephone adapter unit without forming an interconnecting break between the first part and the item of equipment.