Abstract:
A device and method for interfacing a telephone to the telephone network is disclosed for receiving the ICLID of incoming telephone calls and responding in a predetermined manner. An ICLID receiver detects the presence or absence of the ICLID of an incoming telephone call, and receives the ICLID if present. In accordance with predetermined instructions and with the absence of an ICLID or the presence and identity of the ICLID, the device may acknowledge receipt of the ICLID to the incoming caller by generating a brief confirmation tone at minimum charge to the calling party, cause the incoming call to be answered or not answered, and may forward the incoming ICLID information to a predetermined location over the telephone network or by other means.

Description:
BACKGROUND OF THE INVENTION 
     Many telephone calls are not completed because there is nobody in attendance to answer the telephone. People have attempted to get around this problem by installing answering machines and their more sophisticated brethren, the voice mail system. However, many people dislike talking to an answering machine or a voice mail system; and, if the call is long distance, then toll charges apply and the calling party must pay for the dubious privilege of listening to the message on the answering machine. 
     A mechanism is needed that does not cost the calling party anything if no one is there to receive the call yet identifies the calling party and how to contact them. 
     The present invention performs this task in a novel manner. 
     The telephone operating companies around the world are currently deploying Signalling System 7 (SS7) control links within their telephone networks. These links are used to pass control information between telephone switches to allow more efficent use of network resources. One piece of information that is transmitted along these links is commonly referred to as the Incoming Calling Line IDentification (ICLID). This is (typically) the Diallable Number (DN) representing the Customer Premise Equipment (CPE) from which the call is being placed. 
     Many forms of providing the ICLID to the called party are available or proposed. Historically (prior to the introduction of SS7), this ICLID was only available for calls that originated and terminated on the same telephone switch. An example is the internal extension number that has long been available on CENTREX® systems. Today, ICLID information is currently being made available on a more general basis in North America through the services referred to as Custom Local Area Signalling Services (CLASS) in the USA and Call Management Services (CMS) in Canada. As well, the proposed ISDN networks will have ICLID delivery capabilities. 
     The present invention makes use of this ICLID information to provide automated attendant functions. 
     SUMMARY OF THE INVENTION 
     The present invention provides a telephone interface apparatus which includes stored program logic control means for automatically responding in one of a number of possible ways to an incoming call having signalling information such as ICLID information. For example, depending on the signalling information, the logic control means may cause the incoming call to be answered or not answered. If not answered, a brief confirmation signal may be sent to the calling party. The apparatus includes a data receiver for receiving signalling information, such as ICLID information, means for placing the apparatus in an off-hook or an on-hook condition and means for generating dialling signals onto the public switched telephone network, The apparatus may also include one or more of a data modem, a facsimile modem, a voice synthesizer means or voice playback means and a computer network interface, all under control of the logic control means. The apparatus can call back a calling party and effect a connection to a predetermined destination when both are off-hook. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will now be described in detail with reference to the accompanying drawings, in which: 
     FIG. 1 illustrates the conceptual nature of the minimal system via a block diagram. 
     FIG. 2 illustrates the conceptual nature of a programmable system via a block diagram. 
     FIG. 3 illustrates the control flow for the fully configured system. 
     FIG. 4 illustrates a more detailed view of a fully configured system for CLASS/CMS ICLID mechanisms. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention will be described in detail for a system that receives the ICLID information via the CLASS/CMS delivery mechanism. The system, with the exception of the ICLID receiver, is the same for all protocols. One ordinarily skilled in the art could reasonably be expected to replace the CLASS/CMS receiver with a receiver for CENTREX, ISDN or other signalling. The specifications for these interfaces are readily available. 
     With reference to FIG. 1, the simplest way to describe the present invention is as a telephone line interface 12, coupled to an ICLID receiver 10, and an ICLID transmitter 11. The telephone line interface 12 provides the appropriate electrical terminating characteristics to comply with network interfacing standards for the ICLID transmission standard used in this instance of the system. The ICLID receiver 10 decodes the ICLID transmission received through the telephone line interface 12 and stores it. The incoming call is not answered (because there is no one in attendance) and, eventually, the calling party hangs up. The ICLID transmitter now proceeds to the off hook state and places a telephone call to a predetermined destination. The ICLID transmitter 11 forwards the ICLID information from the ICLID receiver 10 once the destination has answered. 
     The process therefore consists of: 
     1) predetermination of forwarding destination; 
     2) incoming call is received; 
     3) ICLID transmission is received; 
     4) ICLID transmission is decoded; 
     5) ICLID transmission is stored; 
     6) calling party abandons call; 
     7) ICLID transmitter originates call to predetermined destination; 
     8) predetermined destination answers call; 
     9) ICLID transmitter forwards stored ICLID information. 
     With reference to FIG. 2, this mechanism may be extended by increasing the functionality between steps (5), (6) and (7). By inserting processing means 20 between the ICLID receiver 10 and the ICLID transmiter 11, greater functionality can be added. This functionality can include the ability to react in different manners to different ICLIDs, to map this ICLID information to other pieces of information or other formats, etc. 
     For example, with reference to FIG. 3, a typical decision tree followed by processing means 20 in response to an ICLID transmission and reception might be as shown. ICLID reception 30 occurs. This corresponds to the completion of step (5) above. In response to the ICLID reception, the processing means 20 can determine whether the name/number is known 31 or unknown 32 via table or database lookup, whether the ICLID was unavailable 33, or suppressed by the calling party 34 (also known as &#34;invoking privacy&#34;), or if there was some other condition such as the ICLID being received but corrupted and other default conditions 35. 
     There are three basic responses that can be generated by the processing means 20. The call can be ignored (don&#39;t answer) and the ICLID information received and stored. The call can be answered very briefly (less than one second) and a confirmation tone applied. If the call is answered and the confirmation tone is very brief then billing is not engaged by the telephone company and the confirmation tone has been received for free. Finally, the call can be answered and appropriate voice or machine prompts can be provided. 
     The ICLID information 30 can be used by the processing means 20 to screen incoming calls and determine the response to generate. For example, if the ICLID is known 31 an answer may not be necessary 36--an example of a &#34;please call me&#34; message, or no answer for security screening. Alternatively, a short confirmation tone 37 could be applied to the line to confirm receipt of the ICLID guaranteeing the ability to return the call, or the call could be answered 38 to allow the caller to leave messages or gain access to the system. 
     If the ICLID is not known 32 to the processing means 20 then the system could answer the call and use voice prompts, or some other means, to elicit the corresponding information from the calling party. Alternatively, the processing means 20 could refuse to answer the call 39 as a security measure. 
     If the delivery of the ICLID has been suppressed 34 the processing means 20 can take this as an indication of the intent of the caller and refuse to answer the call 39. If the system is being used in a customer service setting, for example, the processing means 20 could decide to answer the call anyway 38. 
     The ICLID delivery could be corrupted, the system could experience difficulties, unforeseen issues may occur. These default conditions 35 may result in either an answer 38 or don&#39;t answer 39 state as defined by the operator of the system. 
     With reference to FIG. 4, we will now investigate an example of a fully configured system for the receipt of CLASS/CMS ICLID information. The vast majority of the system is the same for all forms of ICLID reception. Only the line interface 40, the ring detector 41, and the FSK demodulator 43 are likely to change with different forms of ICLID reception. One reasonably skilled in the art would be able to replace these portions of the system with their counterparts for other signalling mechanisms (such as CENTREX®, or ISDN) simply with reference to the corresponding standards and utilizing commercially available components and subsystems. 
     Within the context of the CLASS/CMS ICLID example, the system operates as follows. The line interface 40 provides the proper electrical termination characteristics to satisfy EIA RS-470 and Bellcore TR-TSY-000030 requirements. It also has the ability to go to the on hook or off hook states as directed by the microprocessor 42. The ring detector 41 detects the presence or absence of power ring (nominal 88V AC superimposed on -48V DC) and signals this condition to the microprocessor 42. This information is used by the microprocessor 42 to determine the timing of the ring signals in order to take advantage of the coded ring signalling (commonly known as &#34;Distinctive Ringing&#34;) available from the LECs (Local Exchange Carriers). 
     The FSK (Frequency Shift Key) demodulator 43 converts the FSK ICLID transmission to a TTL level bit stream and forwards it to the microprocessor 42 . The microprocessor then stores this information in RAM 49 or on DISK 50. The microprocessor 42 can then use the ICLID transmission as an index into a database stored in RAM 49 or on DISK 50. This database can contain information such as the name associated with the number (or vice versa), the security clearance, etc. Once the database search has been completed, the microprocessor 42 can decide whether to not answer the call, to give a confirmation tone, or to answer the incoming call. 
     The microprocessor 42 uses software stored in ROM 48, RAM 49, or on secondary storage such as DISK 50 to determine how to answer the incoming call. As illustrated, a number of options are available. The microprocessor 42 directs the line interface 40 to go to the off hook state. The microprocessor 42 can then instruct the voice synthesizer 54 to place voice prompts on the telephone line. In response to these voice prompts the calling party may enter DTMF or Dial Pulse signals, FAX signals, MODEM signals, or attempt to leave a voice message. These responses can be received and interpreted by the microprocessor via one or more of the DTMF/Dial Pulse decoder 44, the FAX modem 45, the modem 46, or the voice digitizer 47. 
     Information about received calls is forwarded under control of the microprocessor 42 by directing the line interface 40 to go to the off hook state. It should be noted that it is not necessary that the line interface for outgoing calls be the same as the line interface for incoming calls. Using the same interface for incoming and outgoing calls reduces system cost but reduces system throughput. By placing the outgoing calls over a different line than the incoming calls, throughput can be increased at the expense of greater system complexity. 
     Once the line interface is in the off hook state, the microprocessor 42 can direct the DTMF/Dial Pulse generator to dial the predetermined destination for forwarding of the received ICLID information. When a connection has been established with the forwarding destination, the ICLID information could be forwarded using one or more of the DTMF/Dial Pulse generator 51, the modem 52, the FAX modem 53, or the voice synthesizer 54 (or other means) depending on whether the receiving party is a machine or a human being. If it is a human being, the voice synthesizer 54 could deliver a message such as &#34;You have received a call from 555-5555&#34; where &#34;555-5555&#34; represents the ICLID information received by the invention. If the ICLID information is being forwarded to another automated system then the more conventional data transmission means of DTMF/ Dial Pulse generation 51, modems 52, or FAX modems 53 could be used. 
     Alternatively, the ICLID information could be routed over internal network facilities such as private lines, or a LAN, using the internal network interface 55 to the local communications facilities. 
     Many further extensions to the operating sequences are, of course, possible. It is the intent of the present invention to disclose an ICLID driven platform for automated attendant operation. It is obvious that the present invention can be used for many other functions than as an automated attendant. For example, secure fax servers, data servers, and voice mail facilities could all be implemented using the ICLID as a first stage in a security system.