Non-KSU message delivery system
AssigneeCasio Communications, Inc.
InventorKenneth R. Core
Life of this patent
Estimating the term…
Abstract
A non-KSU message delivery system enables any station within the non-KSU system to automatically answer incoming calls and prevents more than one station from automatically answering the incoming calls. The non-KSU system allows for distributed recording of voice messages and allows transferred calls to be answered by a specific station's voice mail. The non-KSU system also stores an incoming caller's calling party identification information at a station if the incoming call is either manually or automatically answered by the particular station.
Claims13
A non-key service unit (non-KSU) telephone apparatus for use with a plurality of telephone lines, comprising:
- a line interface having an input operatively coupled to the plurality of telephone lines and a plurality of outputs;
- a microcontroller operatively coupled to the line interface;
- a first multiplexer operatively coupled to the microcontroller and at least a portion of the plurality of outputs of the line interface, the first multiplexer multiplexing transmit and receive audio signals for the plurality of telephone lines;
- a high impedance line interference operatively coupled to the plurality of telephone lines, the high impedance line interface monitoring each of the plurality of telephone lines without adversely affecting a phase response of a modem signal on one of the plurality of telephone lines;
- and
- a second multiplexer operatively coupled to an output of the high impedance line interface and the microcontroller, the second multiplexer multiplexing data received over the plurality of telephone lines and provided by the high impedance line interface;
- a coder/decoder coupled to the first multiplexer, the microcontroller instructing the first multiplexer to couple one of the plurality of telephone lines to the coder/decoder, the coder/decoder receiving a telephone signal from the one telephone line, filtering and compressing the telephone signal, and converting the filtered compressed telephone signal to a digital signal;
- and
- a digital signal processor (DSP) operatively coupled to the coder/decoder and the microcontroller, the DSP analyzing the digital signal provided by the coder/decoder and determining whether the digital signal is a speech signal or DTMF tones,
- wherein if the DSP determines that the digital signal is DTMF tones, the DSP decodes the DTMF tones and provides the decoded DTMF tones to the microcontroller, and
- wherein if the DSP determines the digital signal is a speech signal, the DSP compresses the digital signal and stores the compressed digital signal in a memory.
A message transfer method for a telephone system having a plurality of telephone lines and a plurality of telephone stations, one of which is designated as an auto-attendant station, comprising the steps of:
- a) receiving an incoming call from a caller on a first telephone line;
- b) detecting a ring signal over the first telephone line at the telephone station that was designated to function as the auto-attendant station;
- c) seizing the first telephone line via the auto-attendant station;
- d) playing an outgoing message via the auto-attendant station on the first telephone line;
- e) monitoring a response to the outgoing message by a caller on the first telephone line, the response corresponding to a desired one of the plurality of telephone stations that the caller would like the incoming call transferred to;
- f) directing the incoming call via the auto-attendant station to a desired one of the plurality of telephone stations in accordance with the caller's response;
- g) encoding digital data which includes instructions on handling the incoming telephone call;
- h) transmitting the digital data as a digital bit stream;
- i) modulating the digital bit stream onto a telephone line shared commonly between at least the auto-attendant station and the desired telephone station, the digital bit stream containing information to specifically notify the desired one of the plurality of telephone stations to prepare to receive a transferred call and on which telephone line of the plurality of telephone lines the incoming call resides;
- j) demodulating the modulated digital bit stream at the desired one of the plurality of telephone stations;
- k) decoding the demodulated digital bit stream;
- and
- l) generating a specific ring signal at the desired telephone station to indicate that a call is being transferred,
- wherein if the transferred call is manually answered, the desired telephone station seizes the telephone line on which the transferred call resides, and
- wherein in response to a drop in DC voltage when the desired telephone station seizes the telephone line, placing the auto-attendant station in an on-hook mode.
Dependencies are inferred from the claim text.