Telephonic communications – Reception of calling information at substation in wireline... – Extracting call id from transmitted signal
Reexamination Certificate
2001-12-18
2003-02-25
Barnie, Rexford (Department: 2643)
Telephonic communications
Reception of calling information at substation in wireline...
Extracting call id from transmitted signal
C379S142060, C379S142010, C379S157000, C379S088210, C379S093230
Reexamination Certificate
active
06526132
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an additive service of a public phone communication system and, more particularly, to an apparatus and method for providing a bi-directional Calling Identity Delivery (CID) service.
2. Background of the Related Art
A CID service is intended to display a phone number and a name of a caller, before initiating a call communication or during a call communication, on a display terminal unit of a destination service subscriber. The CID service does this by utilizing an automatic number identification function of a phone network, which function is used for a special purpose such as billing for another provider's relay call.
In addition to providing a data service to an analog subscriber, the CID service field anticipates a considerable technological and industrial effect for a terminal related to computer telephony integration (CTI), which has been recently activated.
FIG. 1
is a schematic block diagram of a CID service unit in accordance with a background art. The background CID service system includes a CID unit
100
of a destination phone set that displays caller information of a destination call. A CID data processing unit
210
generates caller information (termed ‘CID data,’ hereinafter), such as a caller phone number, a caller name, and a call date/time, and transmits the CID data to the destination telephone set.
The CID unit
100
of the destination phone set includes a CID modem
130
that receives CID data from the CID data processing unit
210
; an LCD panel
110
that displays the CID data received through the CID modem
130
; a controller
140
that controls various signals, data transmission, and a display operation of the CID data; and a call circuit unit
120
that controls a call set-up related to the caller, according to a call control signal of the controller
140
. The CID unit
100
may be inserted in the destination phone set or may be installed separately from the destination phone set. The service operation of the CID system of the background art will now be described in detail.
When the caller dials a subscriber number to be called, a pertinent intra-office exchange
300
generates a ‘call connection request signal’ and transmits it through a transmission line to the CID data processing unit
210
of a pertinent called party exchange. While receiving the ‘call connection request signal,’ the CID data processing unit
210
searches a CID service data base DB) (not shown) to check whether the corresponding caller has been registered in the CID service DB. If the caller has been registered in the CID service DB, the CID data processing unit
210
generates CID data, such as a caller number, a name, or a calling date/time, and transmits the CID data when a ring signal is transmitted to the call circuit unit
120
of the destination phone set (between a first ring signal and a second ring signal). The transmitted CID data is transmitted to the CID modem
130
.
The CID modem
130
performs a frequency-shift keying (FSK) demodulation and a predetermined signal-conversion for the received CID data and displays the CID data on the LCD panel
110
. Then, the subscriber can be aware of the caller, by checking the content displayed on the LCD panel
110
.
Data transmission between the CID unit
100
of the destination phone set and the destination exchange
200
is made using the FSK method. The FSK method allows transmission of character data as well as the number and a data transmission in an ON-hook state and an OFF-hook state, so that it is suitable to provide the CID service.
If a new call set-up is requested when the destination phone set is in the OFF-hook state, the CID data processing unit
210
of the destination exchange
200
transmits a specific tone signal to the destination phone set through a speech path of the previously established call. Then, the CID modem
130
recognizes the specific tone signal, according to a control signal of the controller
140
, and transmits a response signal to the CID data processing unit
210
. The CID data processing unit
210
transmits CID data of the call, which has requested a set-up, to the CID modem
130
. Then, the destination phone set performs an FSK demodulation and a signal conversion for the CID data and displays it on the LCD panel
110
. In this manner, the subscriber can identify the caller through the LCD panel
110
, even for a subsequently received phone call which is made while the subscriber is on a prior call communication, so that the subscriber can take a proper step for the other call.
As stated above, the transmission form of the background CID service system is a unidirectional transmission from the CID data processing unit
210
to the CID modem
130
of the subscriber. Thus, it is limited in utilizing the CID more positively.
In addition, since the CID data is stored in the memory of the destination phone set, there is no way for the subscriber to check the CID data without the destination phone set.
This kind of spatial restriction for information and the low equipment use efficiency of the uni-directional transmission have been noticed as the major shortcomings of the CID service system.
The above references are incorporated by reference herein where appropriate for appropriate teachings of additional or alternative details, features and/or technical background.
SUMMARY OF THE INVENTION
An object of the invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
Another object of the present invention is to provide a bi-directional CID service apparatus and method that enable an external communication unit to read CID data stored in a destination phone set.
To achieve at least the above objects in whole or in part, there is provided a bi-directional CID service providing apparatus including: a CID unit of a destination phone set having functions of displaying, storing, transmitting, and receiving CID data of a destined call; a call-originating terminal unit that transmits a CID data request signal to the CID unit of the destination phone set and receives corresponding CID data; and a CID unit of a destination exchange that transmits a ‘CID data transmission control signal’ to the destination phone set, receives the corresponding CID data, and transmits the CID data to the call-originating terminal unit.
To achieve at least these advantages in whole or in part, there is further provided a bi-directional CID service providing method including checking whether a ‘CID data request signal’ has been received, while receiving a call set-up request signal from a call-originating terminal unit; searching a CID service DB to check whether a destination phone number is a registered one, if the ‘CID data request signal’ has been received upon checking; transmitting a ‘CID data transmission control signal’ requesting transmission of CID data from the destination phone set, if the destination phone number has been registered in the DB according to the DB searching result; and transmitting the CID data to the call-originating terminal unit, when the CID data is transmitted from the destination phone set.
The objects of the invention may be achieved in whole or in part by a bi-directional Calling Identity Delivery (CID) device, including a CID communication unit that converts received modulated signals to received baseband signals and converts transmit baseband signals to transmit modulated signals; a CID controller that determines whether a call is a general call or a bi-directional CID service call, based on the received baseband signals; a memory that stores a CID database; and a CID service manager that generates CID information, if a destination terminal identified in the received baseband signals is registered in the CID database, under the control of the CID controller. The CID communication unit converts the CID information to the transmit modulated signals for external transmission.
The objects of the invention may be further achieved
Barnie Rexford
Fleshner & Kim LLP
LG Electronics Inc.
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