KR20010069174A - Telephone call apparatus and method - Google Patents

Abstract

PURPOSE: An apparatus for performing telephone communication between an originator and a receiver is provided to perform the telephone communication through a special exchange, without passing an existing local call network, so as to reduce telephone charges between a terminal and an extension telephone. CONSTITUTION: A call signal processor processes a call signal between a PBX(Private Branch Exchange) subscriber and an external subscriber included in a PSTN(Public Switched Telephone Network)(20). A switching controller(70) builds an exchange for a wireless communication network therein, and controls a PSTN channel and a wireless channel to perform telephone communication between the PBX subscriber and the external subscriber through the exchange without passing a local call network, according to an originating phone number type. The switching controller(70) controls the PSTN channel and the wireless channel to perform the telephone communication through the exchange without passing the local call network, according to a receiving phone number type. A controller(100) controls operations of the call signal processor and the switching controller(70).

Description

Phone call apparatus and method between caller and receiver

The present invention relates to a telephone call apparatus and a method between a caller and a receiver, and more particularly, to a telephone call apparatus and method for lowering the usage fee when a telephone call is made between a caller and a receiver.

Recently, the number of people who own a portable mobile terminal such as PCS, cellular phone, and the like is increasing rapidly. As a result, a user can make a phone call using a regular landline phone or a mobile landline phone using a portable mobile terminal. More users are calling.

Looking at the case of calling from a landline phone to a landline phone and a case from a mobile mobile terminal to a mobile mobile terminal, the discount is available when using the midnight discount time zone, and the fee does not have to be provided to other carriers.

However, there is no discount in the case of making a call from a portable mobile terminal to a landline telephone or from a general landline telephone to a portable mobile terminal. As a result, wireline subscribers are burdened with expensive call charges.

Accordingly, the present invention has been proposed in view of the above-described conventional circumstances, and an object thereof is to provide a telephone call apparatus and method for reducing the call charge even when making a telephone call using any terminal between a sender and a receiver. have.

In order to achieve the above object, a telephone call apparatus between a caller and a receiver according to a preferred embodiment of the present invention comprises: call signal processing means for processing a call signal between an internal subscriber and an external subscriber belonging to a public telephone network;

Incorporating a wireless communication network switch, switching and controlling a trunk line channel and a wireless channel so that a telephone call between the internal subscriber and an external subscriber can be made through the wireless communication network switch without passing through a local telephone network according to the type of outgoing telephone number. Switching control means for switching and controlling a trunk line channel and a radio channel such that a telephone call between the internal subscriber and an external subscriber is made through the wireless communication network switch without passing through a local telephone network according to the telephone number type; And

And control means for controlling the operation of the call signal processing means and the switching control means.

In addition, the telephone call method between the caller and the receiver according to an embodiment of the present invention allows the internal subscriber to make a call through an exchange for a wireless communication network without passing through a local telephone network according to the type of telephone number to be sent when the external subscriber makes a call. In the case of receiving a call from an external subscriber, the call is received through the switch for the wireless communication network without passing through the local telephone network according to the received telephone number type.

1 is a block diagram of a telephone call device according to an embodiment of the present invention;

2 is a diagram illustrating an internal configuration of the switching controller shown in FIG. 1;

3A to 3D are flowcharts for explaining a dialing operation in the telephony device of the present invention;

4A to 4B are flowcharts illustrating a call answering operation in the telephone call apparatus according to the present invention.

<Description of Symbols for Major Parts of Drawings>

10: corporate exchange 20: public telephone network

30a to 30 (m + n): subscriber line matching circuit section

40a to 40 (m + n): codec 50a to 50 (m + n): echo canceller

60a to 60 (m + n): codec 70: switching control unit

80a to 80m: local exchange office (DAA) 90a to 90n: channel

100 control unit 110 DTMF block

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a telephone call apparatus according to an embodiment of the present invention.

The telephone call apparatus according to the embodiment of the present invention is installed between a private branch exchange (PBX) 10 and a public switched telephone network (PSTN) 20.

In addition, the telephone call apparatus according to the embodiment of the present invention is installed between the in-house exchanger 10 and the general telephone, a mobile telephone network, and a TRS (Trunk Radio System) network. In addition, the present invention is applicable to all types of telephone networks such as local telephone network, local long distance telephone network, long distance long distance telephone network, international telephone network, wireless telephone network and the like.

The internal exchange 10 is an exchange facility that is installed in a company or building and connects internal subscribers with external subscribers belonging to the public telephone network 20, and uses m + n internal subscriber lines (channels) of the internal subscribers. It interconnects, connects internal subscribers to external subscribers, and connects external subscribers to internal subscribers.

Subscriber Line Interface Circuit (SLIC) (30a to 30 (m + n)) checks the on / off status of the hook switch when a general landline telephone user of an in-house subscriber line picks up the handset to make a call. The control unit 100 sends a check result signal. When an ordinary landline telephone user picks up the receiver, the current operating voltage (e.g., 48V) is lowered to a predetermined voltage (e.g., 5V) in order to properly process the signal in the codecs 40a to 40 (m + n). When a call comes in, it sends a ring signal to the phone.

The codecs 40a to 40 (m + n) are respectively connected between the subscriber line matching circuit sections 30a to 30 (m + n) and the echo cancellers 50a to 50 (m + n).

The codecs 40a to 40 (m + n) convert analog signals from the subscriber line matching circuit unit 30a to 30 (m + n) into corresponding digital signals when the in-house subscriber makes a call. It sends to echo canceller 50a-50 (m + n).

The codec 40a to 40 (m + n) converts a digital signal input through the echo canceller 50a to 50 (m + n) into a corresponding analog signal when receiving a call. It goes to matching circuit part 30a-30 (m + n).

The echo cancellers 50a to 50 (m + n) are connected between the codecs 40a to 40 (m + n) and the codecs 60a to 60 (m + n).

The echo cancellers 50a to 50 (m + n) cancel the echo components inherent in the digital signals from the codecs 40a to 40 (m + n) when the in-house subscriber makes a call. To 60 (m + n)).

The echo cancellers 50a to 50 (m + n) cancel the echo component inherent in the digital signal from the codecs 60a to 60 (m + n) when the in-house subscriber receives a call. ~ 40 (m + n)).

Typically, the echo cancellers 50a to 50 (m + n) make a duplicate signal of the echo signal from the transmitted signal, and send out after the round trip delay time of the transmission path to cancel the echo signal. To this end, when the subscriber line matching circuit unit 30a to 30 (m + n) is turned off or the ring signals of the local switching centers 80a to 80m (DAA) and the portable mobile terminal (HP) are received, the echo cancellers 50a to 50 are provided. (m + n)) to train. After the call is disconnected or disconnected, the operation of the echo cancellers 50a to 50 (m + n) is stopped.

The codecs 60a to 60 (m + n) are connected between the echo cancellers 50a to 50 (m + n) and the switching controller 70.

The codecs 60a to 60 (m + n) convert the echo canceled digital signal input through the echo canceller 50a to 50 (m + n) into a corresponding analog signal when an in-house subscriber makes a call. The conversion is sent to the switching control unit 70.

The codec 60a to 60 (m + n) converts an analog signal input through the switching control unit 70 into a corresponding digital signal when the in-house subscriber receives a call, and then corresponds to the corresponding echo canceller 50a to 50. (m + n)).

The switching control unit 70 includes a switch for a separate wireless communication network that can be switched without passing through a conventional local telephone network, between the codecs 60a to 60 (m + n) and the public telephone network 20 and the codec ( 60a to 60 (m + n) and between a mobile telephone network and a TRS network. The switching control unit 70 exchanges an extension and a trunk line, an extension and a portable mobile terminal, and a TRS network.

When making a call to a portable mobile terminal through the extension (m + n in-house subscriber lines), the mobile communication terminal passes through the wireless communication network switch, and thus takes the form of calling a mobile mobile terminal from the portable mobile terminal.

On the contrary, when receiving a call from the portable mobile terminal side, the wireless communication network switch is similarly used, and thus takes the form of receiving a telephone call using the portable mobile terminal.

The control unit 100 switches with the subscriber line matching circuit unit 30a-30 (m + n) and the echo canceller 50a-50 (m + n) using the dial tone value detected by the DTMF block 110. The operation of the control unit 70 and the local switching stations 80a to 80m and the channels CH1 to CHn are controlled.

The controller 100 transmits the dial tone detected by the DTMF block 110 to the trunk line 1 to the trunk line m.

The control unit 100 transmits the telephone number detected by the DTMF block 110 to the portable mobile terminal, so that the portable mobile terminal automatically makes a call, and the portable mobile terminal disconnects the phone; When an error occurs in the portable mobile terminal, the portable mobile terminal has a function of turning off and on.

In addition, the control unit 100 compares the detected telephone numbers by hooking off from the subscriber line matching circuit units 30a to 30 (m + n), and controls the switching control unit 70 to control each of the portable mobile terminal or trunk line. The channel is transmitted to an empty channel required for the control, and the switching control unit 70 is controlled so that a channel connected to a trunk line or a portable mobile terminal is connected to an empty extension.

Reference numerals 80a to 80m denote local exchange offices (DAA) provided between the trunk line 1 and the trunk line m of the switching control unit 70 and the public telephone network 20. 90a to 90n are channels CH1 to CHn connecting the switching controller 70 to the portable mobile terminal and the TRS networks HP & TRS1 to HP & TRSn.

Meanwhile, in the above-described embodiment of the present invention, the subscriber line matching circuit section 30a to 30 (m + n), the codecs 40a to 40 (m + n), and 60a to 60 (m + n) and echo cancellation The call signal processing means is collectively referred to as the pluralities 50a to 50 (m + n) and the national switching centers 80a to 80m. The call signal processing means sends a call signal from the internal subscriber to the external subscriber and sends a call signal from the external subscriber to the internal subscriber.

The call signal processing means, the switching control unit 70, the control unit 100, and the DTMF block 110 are integrated in one board, and the board is installed at a site where telephone lines in the telephone terminal box of the company are focused.

FIG. 2 is a diagram illustrating an internal configuration of the switching controller shown in FIG. 1.

The switching control unit 70 includes m + n wireless communication network switches 72a to 72m and 74a to 74n. Each of the wireless communication network switches 72a to 72m and 74a to 74n is connected between each in-house subscriber line (m + n channels) and a trunk line and a portable mobile terminal corresponding to the in-house subscriber line and a channel on the TRS network side. Is installed.

Each of the wireless communication network switches 72a to 72m and 74a to 74n is provided with exchanges A and B capable of exchanging signals with each channel. Each of the wireless communication network switches 72a to 72m and 74a to 74n transmits signals not only to the exchanges A and B of the channel in question but also to the exchanges in other wireless communication network switches. Receive.

For example, when a signal is to be transmitted from the switching unit A of the wireless communication network switch 72a to the switching unit B of the wireless communication network switch 72a, the switching unit of the wireless communication network switch 72a is used. If (B) can be connected, it connects with the exchange part (B). However, if the switching unit B of the wireless communication network switch 72a cannot be connected, it is possible to determine whether the switching unit B in the other wireless communication network switching devices 72a + 1 to 74m can be connected. It connects with the exchange part B.

Next, the operation of the telephone call device between the sender and the receiver according to the embodiment of the present invention configured as described above is as follows.

First, referring to the flowcharts of FIGS. 3A to 3D, an operation of making an internal subscriber's call to a trunk line or a portable mobile terminal will be described.

Before making a call, the controller 100 checks the call waiting state by using the subscriber line matching circuits 30a to 30 (m + n). For example, when a switch of any one subscriber line matching circuit section 30a to 30 (m + n) is hooked off (step S1), the echo canceller installed one-to-one with the corresponding subscriber line matching circuit section is operated. (Step S2).

After that, the controller 100 determines whether there is an empty channel in the public telephone network 20. If there is an empty channel ("Yes" in step S3), the switching control unit 70 is controlled to connect the line of the internal exchange 10 with the empty channel (step S4), and the line of the internal exchange 10 Is connected to the relevant local exchange (one of 80a to 80m) (step S5). Then, the control unit 100 detects the DTMF and exchanges it with the portable mobile terminal or the trunk line, and the current user calls out of the subscriber line matching circuit units 30a to 30 (m + n) that were hooked off during the exchange. When disconnected, the corresponding trunk line is disconnected (steps S6 to S10).

If there is no empty external subscriber line in the public telephone network 20 in step S3, the process moves to step S11 to transmit a pre-call tone at a predetermined frequency level (for example, about 400 Hz) while detecting the telephone number.

Subsequently, the control unit 100 detects the telephone number (step S12) and exchanges it with the general mobile telephone connected to the portable mobile terminal or the trunk line.

If the detected telephone number is a telephone number to the trunk line (“No” in step S13), the control unit 100 receives a busy signal (eg, a 600 Hz cracking sound generated at intervals of about 0.5 to 3 seconds). (Step S14). When the subscriber line matching circuit section 30a to 30 (m + n) and the local switching station (any of 80a to 80m) connected to the trunk line are turned on (“No” in step 15), the control unit 100 Determines whether the external subscriber line connected to the public telephone network 20 is full (step S16).

If the external subscriber line connected to the public telephone network 20 in step S16 is not full (“No” in step 16), the controller 100 controls the switching controller 70 to control the in-house switch 10. The company subscription line is connected to the empty trunk line of the public telephone network 20 (step S17). Then, the hook switch of the local switching station between the empty trunk line and the switching control unit 70 is turned off (step S18), and the telephone number DTMF is sent (step S19). After that, when the subscriber line matching circuit unit is hooked on, the corresponding trunk line is disconnected.

On the other hand, if the telephone number detected in step S12 is a telephone number to the portable mobile terminal, the flow advances to step S20 to check whether the channels 90a to 90n for the portable mobile terminal are full, and not to full. If it is determined that there is an error in the channel for the portable mobile terminal (step S21), and if there is no error, the channel of the in-house exchange 10 is connected with the empty portable mobile terminal channel (step S22).

On the other hand, when the in-house subscriber hangs up in step S12 (SLIC hook-on), the process shifts to step S23 to turn off the pre-call tone, and in step S15, the local switching center 80a to 80m and the subscriber line matching circuit unit 30a to 30. If (m + n)) is on, the flow advances to step S23 to turn off the busy signal tone. Then, the echo canceller that was turned on is turned off (step S24).

If it is clear in step S7 that the in-house subscriber makes a call to the portable mobile terminal, the flow proceeds to step S25 to check whether the channels 90a to 90n for the portable mobile terminal are full, and if it is not full. After determining whether there is an error in the channel for the portable mobile terminal (step S26), if there is no error, the in-house subscriber line of the in-house switch 10 is connected with an empty portable mobile terminal channel (step S27). Then, it is checked that the subscriber line matching circuit portion is on while detecting the telephone number after hooking off the local switching center (steps S28 and S29). If the subscriber line matching circuit portion is turned on as a result of the check, the flow advances to step S34 to disconnect the call.

Thereafter, when the detection of the telephone number is completed ("Yes" in step S30), a call is made to the portable mobile terminal (step S31), and the control unit 100 returns a recognition signal that the call request is received from the portable mobile terminal. The telephone number is continuously transmitted a predetermined number of times until it comes (step S32).

In this way, if the user disconnects the telephone while the user is talking to the portable mobile terminal ("Yes" in step S33), the control unit 100 turns off the echo canceller on the path forming the current communication path. (Step S34), both telephones are disconnected (step S35).

On the other hand, if the channel for the portable mobile terminal is full in step S20 or if there is an error in the channel for the portable mobile terminal in step 21, the control unit 100 proceeds to step S36 to make a busy signal (600 Hz intermittent sound). Is sent again, and it is again determined whether the channel for the portable mobile terminal is full (step S37).

If the channel for the portable mobile terminal is full in step S37, the controller 100 checks whether the subscriber line matching circuit unit 30a to 30 (m + n) is on and checks the telephone connection state (step S38). ). If the subscriber line matching circuit unit 30a to 30 (m + n) is off, it is determined whether all the lines connected to the public telephone network 20 are currently used, and if all are used ("Yes" in step S39), the process returns to step 37. Continue.

If the channel for the portable mobile terminal is not full in step S37, the process proceeds to step S40 to determine whether there is an error in the channel for the portable mobile terminal. It connects with the channel for a terminal (step S41).

Referring to the flowcharts of FIGS. 4A and 4B, an operation of making a call to an in-house subscriber from outside (that is, receiving a call when viewed from the side of a telephone call device according to an embodiment of the present invention) will be described.

First, the control part 100 checks whether the ring signal of the local switching center 80a to 80m is input, or the ring signal from the portable mobile terminal is input.

When a ring signal from any one of the domestic switching centers 80a to 80m is input (“Yes” in step S50), the switching control unit 70 is controlled so that the line of the public telephone network 20 is empty in the in-house exchange 10. After the connection with the existing in-house subscriber line (channel) (step S51), the echo canceler on the currently formed call path is turned on and a ring signal is sent to the empty in-house subscriber line through the subscriber line matching circuit section (step S52).

The control unit 100 continuously checks whether the ring signal of the local switching center 80a to 80m is input until the extension user (that is, the in-house subscriber) picks up the phone (step S53).

If a ring signal is continuously input, it is checked whether or not the subscriber line matching circuit portion on the currently formed call path is hooked off (step S54). When the subscriber line matching circuit portion is in the hook hop state, that is, when the extension user picks up the telephone, the ring signal to the corresponding subscriber line matching circuit portion is turned off (step S55). After that, the telephone exchange is connected by hooking off the foreign exchange station of the corresponding trunk line (step S56).

As described above, the controller 100 determines whether the telephone is disconnected according to whether the subscriber line matching circuit part on the corresponding call path is turned on or off (step S57).

When the subscriber line matching circuit unit is turned on in step S57, the telephone line is recognized as disconnected, and the echo canceler on the corresponding communication path is turned off (step S58), and the corresponding local switching station is hooked on (step S59).

If the ring signal of the local switching stations 80a to 80m is not continuously generated in step S53, the ring signal to the subscriber line matching circuit unit is turned off (step S60) and the process returns to step S58.

On the other hand, when a ring signal from the portable mobile terminals HP1 to HPn is input (“Yes” in step S61), the control unit 100 controls the switching control unit 70 to carry out channels 90a to 90n for the portable mobile terminal. ) Is connected to the empty in-house subscriber line of the in-house exchange 10 (step S62), and the echo canceler on the currently formed call path is turned on and a ring signal is sent to the empty in-house subscriber line through the subscriber line matching circuit. (Step S63).

The control unit 100 continuously checks whether the ring signal of the portable mobile terminals HP1 to HPn is input until the in-house subscriber picks up the phone (step S64). It is checked whether or not the line matching circuit part is hooked off (step S65).

When the subscriber line matching circuit portion is in the hook hop state, that is, when the extension user picks up the telephone, the ring signal to the subscriber line matching circuit portion is turned off (step S66). After that, the telephone is connected through the channels 90a to 90n for the portable mobile terminal (step S67).

As described above, the controller 100 determines whether the telephone is disconnected according to whether the subscriber line matching circuit part on the corresponding call path is turned on or off (step S68).

When the subscriber line matching circuit unit is turned on in step S68, the call is recognized as disconnected and the echo canceler on the corresponding call path is turned off (step S69), and the call of the portable mobile terminal is terminated (step S70). When the ring signal of the portable mobile terminals HP1 to HPn is not continuously generated in step S64, the ring signal to the subscriber line matching circuit unit is turned off and the process returns to step S69.

On the other hand, in the above-described embodiment of the present invention has been described as being employed in the same building or a company with an in-house exchanger 10, it may be installed and used in a general home or other buildings as needed.

According to the present invention as described above, when the telephone call from the extension to the trunk line is followed by the conventional method, and when the telephone call from the extension to the portable mobile terminal or the telephone call from the portable mobile terminal to the extension, Since the telephone calls between the two parties are made through a separate wireless communication network switch without going through the local telephone network, users' phone charges are low, and wireless communication service providers can also save money. In addition, there is an advantage that can increase the number of subscribers.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (22)

Call signal processing means for processing a call signal between an internal subscriber and an external subscriber belonging to a public telephone network; Incorporating a wireless communication network switch, switching and controlling a trunk line channel and a wireless channel so that a telephone call between the internal subscriber and an external subscriber can be made through the wireless communication network switch without passing through a local telephone network according to the type of outgoing telephone number. Switching control means for switching and controlling a trunk line channel and a radio channel such that a telephone call between the internal subscriber and an external subscriber is made through the wireless communication network switch without passing through a local telephone network according to the telephone number type; And And control means for controlling the operation of said call signal processing means and said switching control means. The method of claim 1, And said call signal processing means, switching control means and control means are integrated in one board. The method of claim 2, The board is a telephone call device between the caller and the receiver, characterized in that installed in the area where the telephone lines in the telephone box focused. The method of claim 1, And the switching control means is applied to a long distance long distance telephone network. The method of claim 1, And said switching control means is applied to an international telephone network. The method of claim 1, And said switching control means is applied to a mobile telephone network. The method of claim 1, And said switching control means is applied to a wireless telephone network. The method of claim 1, And the switching control means is applied to a TRS network. The method of claim 1, The switch for the wireless communication network in the switching control means is installed between each in-house subscriber line and an external channel provided one-to-one correspondence to the in-house subscriber line, and each of the switch for the wireless communication network transmits and receives a first signal and a mutual signal. And a second exchange unit. The method of claim 9, The first and the second exchange unit in each of the wireless communication network switch exchanges signals between the channels as well as the exchanges in the wireless communication network exchange installed in other channels in a cross. Telephony device. In the way a company subscriber calls an external subscriber connected to a public telephone network, And a telephone call between the caller and the receiver according to a type of a telephone number that the internal subscriber makes when calling the external subscriber, through a switch for a wireless communication network without passing through a local telephone network. The method of claim 11, The telephone communication method between the sender and the receiver, characterized in that the wireless communication network switch is applied to a long distance long-distance telephone network. The method of claim 11, The telephone communication method between the sender and the receiver, characterized by applying the wireless communication network switch to an international telephone network. The method of claim 11, And a wireless communication network switch is applied to a mobile telephone network. The method of claim 11, And a switch for the wireless communication network applied to a wireless telephone network. The method of claim 11, The telephone communication method between the sender and the receiver, characterized in that the switch for the wireless communication network applied to the TRS network. In the method that the in-house subscriber receives a call from an external subscriber connected to the public telephone network, And when the internal subscriber receives a call from the external subscriber, receives a call through a switch for a wireless communication network without passing through a local telephone network according to the received telephone number type. The method of claim 17, The telephone communication method between the sender and the receiver, characterized in that the wireless communication network switch is applied to a long distance long-distance telephone network. The method of claim 17, The telephone communication method between the sender and the receiver, characterized by applying the wireless communication network switch to an international telephone network. The method of claim 17, And a wireless communication network switch is applied to a mobile telephone network. The method of claim 17, And a switch for the wireless communication network applied to a wireless telephone network. The method of claim 17, The telephone communication method between the sender and the receiver, characterized in that the switch for the wireless communication network applied to the TRS network.