# US 5,327,487 A · Facsimile apparatus and method for use with customer switching system

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- Number: US 5,327,487 A
- Document ID: US5327487A
- Status: Granted
- Kind: A
- Application number: 07/822,806
- Filed: 1992-01-21
- Granted: 1994-07-05
- Earliest claimed: 1992-01-21
- Assignees: AT&T Bell Laboratories
- Inventors: Sanford S. Brown; Mark A. Crandall; Harvey S. Schultz
- Web page: https://patentgrep.com/patent/US5327487A

## CPC

- H04N 1/32791: {Arrangements for reducing the handshaking procedure or protocol time}
- H04N 1/32005: {Automation of particular receiver jobs, e.g. rejecting unwanted calls (requesting a communication from a transmitter H04N1/32771; with picture signal storage for forwarding messages H04N1/32358)}
- H04N 1/327: Initiating, continuing or ending a single-mode communication; Handshaking therefor {(H04N1/32614 takes precedence)}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A facsimile (fax) machine is arranged to automatically answer a call and to transmit a fax message if a document or stored message is awaiting transmission, otherwise the fax machine goes into a fax receive mode. In another arrangement, the fax machine is connected to a station port of a customer switching system such that an existing call at a system station set can be transferred to the fax machine when a fax message is to be transmitted or received as part of that call. In one embodiment a station set and fax machine are packaged together in one housing.

## Claims

### Claim 1

A facsimile (fax) apparatus comprising:
means for answering a call received over a communication channel connected to said fax apparatus;
means for detecting the presence of a fax message awaiting to be transmitted from said fax apparatus; and
means, responsive to said call and a detected presence of said fax message, for transmitting said fax message over said channel without first sending a digital identification signal (DIS) over said channel.

### Claim 2

The fax apparatus 1 wherein said transmitting means transmits said fax message without first receiving a digital transmit command (DTC) signal over said channel.

### Claim 3 (depends on 1)

The fax apparatus of claim 1 further comprising
means, responsive to an answered call and a detected absence of said fax message, for receiving a fax transmission over said channel.

### Claim 4 (depends on 1)

The fax apparatus of claim 1 wherein
said answering means includes interface means responsive to a predetermined signaling format received over said channel, said interface means adapting said received signaling format to signals compatible with said fax apparatus.

### Claim 5 (depends on 1)

The fax apparatus of claim 1 not including dialing means for originating a communication connection over said channel.

### Claim 6 (depends on 1)

The fax apparatus of claim 1 wherein said fax message is a document and wherein said detecting means detects the presence of said document in said fax apparatus.

### Claim 7 (depends on 1)

The fax apparatus of claim 1 further comprising
a memory unit for storing said fax message and wherein said detecting means detects the presence of said fax message in said memory unit.

### Claim 8 (depends on 1)

The fax apparatus of claim 1 wherein said channel is a first channel and wherein said fax apparatus further comprises
means for establishing a call connection over a second communication channel, and
means for sending a transfer control signal over an established second channel call connection, to signal a request for a call connection transfer to said first channel.

### Claim 9 (depends on 8)

The fax apparatus of claim 8 wherein said first channel and said second channel are different channels of one communication facility.

### Claim 10

A communication system comprising
a control unit for switching a communication connection from a first facility to a second facility in response to a transfer control signal received over said first facility, and for sending an alerting signal over said second facility in response to said transfer control signal;
a station set connected to said first facility, said station set including means for establishing a connection over said first facility, and
means for sending said transfer control signal to said control unit to transfer said established communication connection from said first facility to said second facility; and
a fax apparatus (fax) connected to said second facility, said fax apparatus including,
means, in response to receiving said alerting signal over said second facility from said control unit, for going off-hook and transmitting a fax message over said second facility without first sending a control signal over said second facility.

### Claim 11 (depends on 10)

The system of claim 10 wherein said fax apparatus further includes
means for detecting the presence of a fax message awaiting to be transmitted from said fax apparatus, and wherein
said transmitting means is responsive to a fax message present signal from said detecting means for establishing a fax transmit mode to transmit said fax message.

### Claim 12 (depends on 11)

The system of claim 11 wherein said fax apparatus includes
means for receiving a fax message over said second facility and wherein said receiving means is responsive to the absence of said fax message present signal for establishing a fax receive mode.

### Claim 13 (depends on 10)

The system of claim 10 wherein said sending means of said station set includes a transfer button for sending said transfer control signal to said control unit.

### Claim 14 (depends on 10)

The system of claim 10 wherein said sending means includes a dial pad at said station set for sending said transfer control signal to said control unit.

### Claim 15 (depends on 10)

The system of claim 10 wherein said transfer control signal is generated using a single button which signals a call transfer and identifies said second facility which connects to said fax apparatus.

### Claim 16 (depends on 10)

The system of claim 10 wherein said station set and said fax apparatus are packaged together as one communication apparatus.

### Claim 17 (depends on 10)

The system of claim 10 wherein said alerting signal is a ring signal.

### Claim 18 (depends on 10)

The system of claim 10 wherein said alerting signal is a digitally encoded signal.

### Claim 19 (depends on 10)

The system of claim 10 wherein said fax machine includes no dialing means.

### Claim 20 (depends on 10)

The system of claim 10 wherein said control unit is part of a centrex central office.

### Claim 21 (depends on 10)

The system of claim 10 wherein said system is a KEY telephone system.

### Claim 22 (depends on 10)

The system of claim 10 wherein said system is a private branch exchange (PBX) system.

### Claim 23

A method of operating a facsimile (fax) apparatus comprising the steps of:
answering a call received over a communication channel connected to said fax apparatus;
detecting the presence of a fax message awaiting to be transmitted from said fax apparatus; and
in response to said call and a detected presence of said fax message, transmitting said fax message over said channel without first sending a digital identification signal (DIS) over said channel.

### Claim 24 (depends on 23)

The method of claim 23 further comprising the step of
in response to a detected absence of said fax message, receiving a fax transmission over said channel.

### Claim 25 (depends on 23)

The method of claim 23 wherein said channel is a first channel and wherein said method further comprises the steps of
establishing a call connection over a second communication channel, and
sending a transfer control signal over an established second channel call connection to signal a request for a call connection transfer to said first channel.

### Claim 26

A method of operating a communication system comprising the steps of
at a control unit, switching a communication connection from a first facility to a second facility in response to a transfer control signal received over said first facility, and
sending an alerting signal over said second facility in response to said transfer control signal;
at a station set connected to said first facility, establishing a connection over said first facility,
sending said transfer control signal to said control unit to transfer said established communication connection from said first facility to said second facility; and
at a fax apparatus connected to said second facility, going off-hook, in response to receiving said alerting signal over said second facility from said control unit, and transmitting a fax message over said second facility without first sending a control signal over said second facility.

### Claim 27 (depends on 26)

The method of claim 26 wherein said fax apparatus includes the steps
detecting the presence of a fax message awaiting to be transmitted from said fax machine, and wherein
said transmitting step is responsive to a detected fax message for establishing a fax transmit mode to transmit said fax message.

### Claim 28 (depends on 26)

The method of claim 26 wherein said transfer control sending step signals a call transfer operation to said control unit and identifies said second facility to which the communication connection is to be transferred.

### Claim 29

A facsimile (fax) apparatus comprising:
means for automatically answering a call received over a communication channel connected to said fax apparatus;
means for detecting the presence of a fax message awaiting to be transmitted from said fax apparatus; and
means, responsive to said call and a detected presence of said fax message, for transmitting said fax message over said channel after first receiving a digital identification signal (DIS) over said channel.

### Claim 30 (depends on 29)

The fax apparatus of claim 29 wherein said transmitting means transmits said fax message after sending a digital command signal (DCS) over said channel.

### Claim 31

A method of operating a facsimile (fax) apparatus comprising the steps of:
automatically answering a call received over a communication channel connected to said fax apparatus;
detecting the presence of a fax message awaiting to be transmitted from said fax apparatus;
receiving a digital identification signal (DIS) over said channel; and
in response to a detected presence of said fax message, and a received digital identification signal (DIS) over said call, transmitting said fax message over said channel.

### Claim 32 (depends on 31)

The method of claim 31 further comprising the step of
sending a digital command signal (DCS) over said channel, and
wherein said transmitting step transmits said fax message only after sending said digital command signal (DCS) over said channel.