JP2012065290A - Telephone switching system and telephone switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform processing by an operation instruction using voice without influencing a telephone call in a telephone switching system and telephone switching device.SOLUTION: A telephone switching system comprises: a telephone switching device 100 communicatively connecting with a circuit switching network 300 and connected to a telephone terminal 10A; and a voice recognition device 200 generating a control signal based on a voice signal output from the telephone switching device 100. The telephone switching device 100 determines whether or not the voice signal transmitted from a circuit switching part 113 to the telephone terminal 10A is a tone signal, at a transmission control part 120. When it is determined that the signal is the tone signal; the transmission control part 120 outputs a route switching instruction to a transmission switching part 111 switching a transmission route of a voice signal from the telephone terminal 10A so as for the voice signal to be transmitted to the voice recognition device 200, and the voice recognition device 200 converts the voice signal for controlling a telephone call whose vocalization is made at the telephone terminal 10A into a control signal to control the telephone call.

Description

  The present invention relates to a telephone exchange system and a telephone exchange apparatus that perform a call operation using voice, for example.

  A call center that handles telephone correspondence with customers handles incoming calls and makes calls to customers. When a call center telephone support person makes a telephone call with a customer, the customer information is displayed on a display screen of a computer or the like to confirm the customer information or record the contents of the call with the customer. Therefore, work efficiency is required so that other work can be performed while talking.

  In recent years, the speech recognition rate of speech recognition devices that detect speech and convert it to text, or convert the detected speech into instruction signals has increased. Such a speech recognition apparatus is expected as a tool that reduces manual work such as using buttons and a mouse by inputting instructions by voice.

JP 2000-101719 A

  When a voice recognition device is introduced into a telephone exchange system provided in a call center or the like, since a voice signal is used for both a call and an operation instruction, it is necessary to perform processing by distinguishing between a call voice and an operation instruction voice. . In addition, the voice operation instruction or its processing should not affect the call.

  An object of the present invention is to provide a telephone exchange system and a telephone exchange apparatus that perform processing based on voice operation instructions without affecting a call.

To achieve the above object, a telephone switching system includes a telephone switching apparatus connected to a communication network and connected to a telephone terminal, and a voice recognition apparatus that generates a control signal based on a voice signal output from the telephone switching apparatus. A telephone exchange system comprising: a circuit exchange unit for exchanging a call to the telephone terminal based on a control signal generated by the voice recognition device; and A receiving distribution unit that distributes a voice signal sent to the telephone terminal, and a path switching of the voice signal input from the telephone terminal to a call path connected to the circuit switching unit or an instruction path connected to the voice recognition device And a transmission switching unit that performs the determination of whether or not the audio signal distributed by the reception distribution unit is a tone signal, and the audio signal is a tone signal A transmission control unit that issues a switching instruction to switch the connection path of the transmission switching unit to an instruction path connected to the speech recognition device. A telephone exchange apparatus for performing communication includes a telephone exchange apparatus connected to a communication network and connected to a telephone terminal, and a voice recognition apparatus that generates a control signal based on a voice signal output from the telephone exchange apparatus A telephone switching device of a switching system, wherein a circuit switching unit performs a circuit switching based on a control signal generated by the voice recognition device, and a voice signal transmitted from the circuit switching unit to the telephone terminal. A voice distribution unit that distributes a voice signal input from the telephone terminal and a voice path that is connected to the circuit switching unit or a finger that is connected to the voice recognition device It is determined whether the voice signal distributed by the transmission switching unit for switching the route to the route and the reception distribution unit is a tone signal, and when the voice signal is a tone signal, A transmission control unit for instructing switching so as to switch the connection path of the speech switching unit to the instruction path connected to the voice recognition device.

1 is a block diagram showing a configuration of a telephone exchange system according to an embodiment of the present invention. The block diagram which shows the structure of the telephone switching apparatus and speech recognition apparatus which are provided in the telephone switching system of FIG. The sequence diagram which shows the operation | movement of call origination-call establishment in the telephone exchange system of FIG. 1, and a hold / hold release operation | movement. The sequence diagram which shows the operation | movement of the transmission cancellation-call memo in the telephone exchange system of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a telephone exchange system showing an embodiment.
The telephone exchange system includes a telephone exchange device 100, a voice recognition device 200, and a call memo database (DB) 210.

  When the telephone terminal 10A is connected to the telephone switching apparatus 100, the outgoing call from the telephone terminal 10A is connected to a communication network such as the circuit switching network 300, or when there is an incoming call from the telephone terminal 10B via the circuit switching network 300, The incoming call is connected to the telephone terminal 10A. The voice recognition device 200 is connected to the telephone exchange device 100, detects the voice transmitted from the telephone exchange device 100, converts it to text, converts the detected voice into an instruction signal, and the result is the telephone exchange device. Output to 100. In addition, a call memo DB 210 is connected to the voice recognition device 200, and the voice that has been converted into text is recorded in the call memo DB 210.

  FIG. 2 is a block diagram showing configurations of the telephone exchange device 100 and the voice recognition device 200 of the telephone exchange system of FIG.

  The telephone exchange device 100 includes a call connection unit 110 that connects a call by performing circuit switching, and a transmission control unit 120 that controls a transmission path so as to switch between a call and a voice instruction. The call connection unit 110 includes a transmission switching unit 111, a reception distribution unit 112, a line switching unit 113, a call control unit 114, and a tone generation unit 115.

  The transmission switching unit 111 uses a voice signal input from the telephone terminal 10 </ b> A connected to the telephone exchange 100 as a path (hereinafter referred to as a call path) connected to the circuit switching unit 113 that is a path for a call. The connection with a path (hereinafter referred to as an instruction path) connected to a voice recognition device for voice instructions is switched. This switching is switched based on a switching instruction signal indicating an instruction from the transmission control unit 120.

  The call distribution unit 112 transmits a voice signal transmitted from the circuit switching network 300 side to the telephone terminal 10A connected to the telephone switching apparatus 100 via the circuit switching unit 113 to the telephone terminal 10A and a transmission control unit. Distribute to 120.

  The circuit switching unit 113 performs circuit switching so as to connect a line between a caller telephone terminal (for example, the telephone terminal 10A) and a destination telephone terminal (for example, the telephone terminal 10B) via the circuit switching network 300. In addition, when the dial tone is sent to the caller telephone terminal or the hold tone is sent to the caller and callee telephone terminals, the line switching unit 113 is connected to the tone generator 115 and the caller and callee telephone terminals. Circuit exchange to connect

  The call control unit 114 is connected to an interface with the telephone terminal 10A connected to the circuit switching unit 113, the tone generation unit 115, and the telephone switching apparatus 100 via a control bus (not shown). The call control unit 114 is connected to the caller and the callee or the tone generator 115 based on the callee's telephone number input from the caller's caller terminal or a call control instruction signal such as disconnection or hold. The circuit switching of the circuit switching unit 113 is controlled, and the type of tone signal generated by the tone generating unit 115 is controlled.

  The tone generator 115 generates a dial tone and a hold tone. When line switching is performed with the circuit switching unit 113, the dial tone generated by the tone generation unit 115 is sent to the transmitting terminal. In the case of hold, the tone generator 115 generates a hold sound that is a tone signal indicating hold. Generation of such a tone signal is controlled by the call control unit 114.

  The transmission control unit 120 receives the audio signal distributed by the reception distribution unit 112, and the input audio signal is one of a dial tone, RBT (Ring Back Tone), hold tone, or BT (Busy Tone). The reception detection function 121 for determining whether the tone signal is a switching signal, and a switching instruction for outputting an instruction to the transmission switching unit 111 to switch the connection path of the transmission switching unit 111 based on the determination result by the reception detection function 121 And a function 122. For example, the incoming call detection function 121 compares the tone signal information stored in advance in the memory within the transmission control unit 120 with the voice waveform of the input voice signal, so that the tone signal or the voice of the call is detected. Judge whether it is other than tone signal.

  The switching instruction function 122 switches the transmission switching unit 111 to an instruction path connected to the voice recognition device 200 when the received voice signal is determined to be a tone signal by the reception detection function 121. A switching instruction signal is output. While detecting the tone signal by the reception detection function 121, the transmission control unit 120 outputs a switching instruction signal so that the transmission switching unit 111 is connected to the instruction path that is the path on the voice recognition device 200 side. To do. While the incoming call detection function 121 detects a signal other than a tone signal, the transmission switching unit 111 is switched to a call path connected to the circuit switching unit 113.

  For example, the transmission switching unit 111 is normally connected to a call path, and while the tone detection signal 121 is detected by the reception detection function 121, the switching instruction signal from the transmission switching unit 11 is continuously output. While this switching instruction signal is input, it is connected to the instruction path side so as to send a signal to the voice recognition device 200 side. The correspondence between the switching of the transmission switching unit 111 and the switching instruction signal is not limited to the above, but the transmission path of the transmission switching unit 111 is switched by the input of the switching instruction signal. A switching instruction signal may be output when switching to the network switching or when switching to the circuit switching unit 113 side.

  The voice recognition device 200 receives a voice signal from a caller telephone terminal via the transmission switching unit 111. As this voice signal, an instruction voice signal for controlling a call and a voice signal for a call memo are assumed. When a signal based on an instruction voice for controlling a call is input, the voice recognition device 200 generates a control signal corresponding to the instruction voice and outputs the control signal to the call control unit 114. When a voice signal for a call memo is input, a process such as converting the voice signal into text is performed and recorded in the call memo DB 210. The determination of the input voice signal by the voice recognition apparatus 200 is performed by, for example, comparing the instruction voice information stored in advance in the memory in the voice recognition apparatus 200 with the input voice, and the input voice matches the instruction voice stored in the memory. If so, the instruction voice is determined. For example, if the instruction voice is a destination telephone number, “call” and “phone number” after utterance, “stop” if the call is to be stopped, “ “Release”, in the case of a call memo, “Memo” and “Memo content” after the utterance.

  FIG. 3 is a sequence diagram showing operations of call origination to call establishment and hold / hold release operation in the telephone exchange system of FIG. Here, a case where a call is made from the telephone terminal 10A connected to the telephone switching apparatus 100 to the telephone terminal 10B connected via the circuit switching network 300 will be described as an example. As an initial state of the outgoing call operation, it is assumed that the transmission switching unit 111 of the telephone exchange device 100 is connected to the circuit switching unit 113 side.

[Outgoing action]
When the user is off-hooked at the originating telephone terminal 10A (hereinafter referred to as the originating terminal 10A), an off-hook signal is sent to the call control unit 114 via a control bus (not shown) of the circuit switching apparatus 100 (step S101). ). The call controller 114 controls the tone generator 115 to generate a dial tone from the tone generator 115, and controls the circuit switching unit 113 to send the generated dial tone to the caller terminal 10A. As a result, a dial tone is sent to the caller terminal 10A via the circuit switching unit 113 and the call distribution unit 112 (step S102).

  At this time, the reception distribution unit 112 distributes the dial tone into two, outputs one to the source terminal 10A side, and outputs the other to the transmission control unit 120. The transmission control unit 120 detects a dial tone transmitted from the reception distribution unit 112 by the reception detection function 121, and uses the switching instruction function 122 to set a transmission path to the transmission switching unit 111 on the circuit switching unit 113 side ( A switching instruction signal is output so as to switch from the speech path) to the voice recognition device 200 side (instruction path) (step S103). When the switching instruction signal is input, the transmission switching unit 111 switches the transmission path to connect to the instruction path.

  For example, when “calling, 03-1111-xxxx” or the like is uttered so as to designate a callee number from the user at the caller terminal 10 </ b> A, an audio signal designating the callee number is sent from the transmission switching unit 111. It is sent to the speech recognition apparatus 200 (step S104). When the voice signal is input, the voice recognition device 200 determines the voice signal, generates a control signal to be transmitted to the designated destination number, and outputs the generated control signal to the call control unit 114. (Step S105). The call control unit 114 controls the circuit switching unit 113 to transmit to the destination number based on the control signal, and transmits the call to the destination number via the circuit switching network 300 (step S106). At this time, RBT is transmitted from the circuit switching network 300 to the source terminal 10A (step S107).

[Call establishment operation]
When the incoming call terminal 10B (hereinafter called the incoming call terminal 10B) rings and is off-hooked by the user, a call is started (step S201). The voice signal from the destination terminal 10B is distributed to the source terminal 10A side and the transmission control unit 120 side by the reception distribution unit 112 of the telephone exchange device 100. The transmission control unit 120 switches the transmission path to the transmission path side with respect to the transmission switching unit 111 by the switching instruction function 112 because the dial tone detected at the time of the transmission operation is no longer detected. An instruction signal is output (step S202). The transmission switching unit 111 switches the transmission path to the call path side in accordance with an instruction from the transmission control unit 120. When the transmission path of the transmission switching unit 111 is switched to the circuit switching unit 113 side, that is, the communication path, the voice signal from the source terminal 10A is guided from the circuit switching unit 113 to the circuit switching network 300, and the destination terminal 10B. An audio signal is sent to (step S203).

[Hold / Release action]
When a hold signal indicating a hold is output by a user's button operation or the like at the caller terminal 10A, a hold signal is sent to the call control unit 114 via a control bus (not shown) (step S301). The call controller 114 controls the tone generator 115 to generate a holding tone from the tone generator 115 and controls the circuit switching unit 113 to send the generated holding tone to the caller terminal 10A and the callee terminal 10B. To do. That is, the hold tone is sent to the caller terminal 10A and the callee terminal 10B (step S302).

  At this time, the hold sound transmitted to the source terminal 10A side is distributed to the source terminal 10A side and the transmission control unit 120 side by the reception distribution unit 112. The transmission control unit 120 detects the holding tone transmitted from the reception distribution unit 112 by the reception detection function 121, and uses the switching instruction function 122 to specify the transmission path from the call path side to the transmission switching unit 111. A switching instruction signal is output so as to switch to the side (step S303). When the switching instruction signal is input, the transmission switching unit 111 switches the transmission path to be connected to the voice recognition device 200 side.

  When, for example, “release” is uttered so as to release the hold at the source terminal 10A, a voice signal designating release of the hold is sent from the transmission switching unit 111 to the voice recognition device 200 (step S304). . When the voice signal is input, the voice recognition device 200 determines the voice signal, generates a control signal so as to release the hold, and outputs the generated control signal to the call control unit 114 (step S305). The call control unit 114 controls the circuit switching unit 113 and the tone generation unit 115 to release the hold, and releases the hold (step S306).

  When the hold is released, the voice signal from the destination terminal 10B is again distributed to the source terminal 10A side and the transmission control unit 120 side by the reception distribution unit 112 of the telephone exchange device 100. Since the hold sound that was detected during the hold operation is no longer detected, the transmission control unit 120 switches the transmission route to the call path side with respect to the transmission switching unit 111 by the switching instruction function 112. An instruction signal is output (step S307). The transmission switching unit 111 switches the transmission path to the call path side in accordance with an instruction from the transmission control unit 120. When the transmission path of the transmission switching unit 111 is switched to the circuit switching unit 113 side, that is, the communication path, the voice signal from the source terminal 10A is guided from the circuit switching unit 113 to the circuit switching network 300, and the destination terminal 10B. An audio signal is sent to (step S308).

  In this way, during the off-hook and on-hold when the voice for the call is not made at the call origination terminal 10A, the transmission path is connected to the voice signal from the call origination terminal 10A to the instruction path on the voice recognition device 200 side. By doing so, it is possible to control the voice call from the caller terminal 10A. At this time, while the off-hook and hold tone signals are not detected, the transmission switching unit 111 is controlled to send the voice signal from the caller terminal 10A to the circuit switching unit 113 side. A telephone call can be performed without being affected by the control of the telephone call by the voice signal from the former terminal 10A. In addition, by configuring as described above, even when the voice switching unit 111 sends the voice signal from the source terminal 10A to the voice recognition device 200 side, Since the audio signal is sent to the caller terminal 10A, the audio signal from the other party is not missed. Furthermore, during the period when speech is not made for a call, the resources of each part of the telephone exchange device 100 that processes the voice signal from the caller terminal 10A can be used effectively.

  Note that the hold and hold release operations at the caller terminal 10A are the same as when the telephone terminal 10A is calling by calling from the telephone terminal 10B, even when the telephone terminal 10A is receiving a call from the telephone terminal 10B. Can be done.

  FIG. 4 is a sequence diagram showing operations of outgoing call, outgoing call stop, and call memo in the telephone exchange system of FIG. Here, a case where a call is made from the telephone terminal 10A connected to the telephone switching apparatus 100 to the telephone terminal 10B connected via the circuit switching network 300 and disconnected by the telephone terminal 10A before the telephone terminal 10B goes off-hook is taken as an example. I will give you a description. An example of recording a call memo in the call memo DB 210 after disconnection will be described. Since the transmission operation is the same as that described in FIG. 3, the same sequence as that in FIG. 3 is denoted by the same step number as in FIG. 3, and the description thereof is omitted.

[Dialing operation]
Here, it is a case where the call is transmitted from the caller terminal 10A to the callee terminal 10B by the call operation steps S101 to S107 similar to those in FIG. 3, and is not off-hooked by the callee terminal 10B. In addition, the transmission switching unit 111 is connected to the speech recognition apparatus 200 side by the transmission operation, and the transmission switching unit 111 transmits the transmission path to the speech recognition apparatus 200 side even while the RBT is being transmitted. Is connected. That is, the voice signal sent from the caller terminal 10 </ b> A is sent to the voice recognition device 200. When, for example, “cancel” is uttered so as to cancel the transmission at the caller terminal 10A, an audio signal designating the cancellation is transmitted from the transmission switching unit 111 to the speech recognition apparatus 200 (step S401). When the voice signal is input, the voice recognition device 200 determines the voice signal, generates a control signal so as to stop transmission, that is, disconnects, and outputs the generated control signal to the call control unit 114 (step). S402). The call control unit 114 controls the circuit switching unit 113 to stop the transmission, and sends a control signal indicating disconnection to the circuit switching network 300 side (step S403).

[Call memo recording operation]
When the call with the destination terminal 10B is disconnected, a BT is sent from the circuit switching network 300 side to the telephone terminal 10A connected to the telephone switching apparatus 100 via the circuit switching unit 113 (step S501). At this time, if it is after the call stopping operation in steps S401 to S403, the transmission switching unit 111 has a transmission path connected to the voice recognition apparatus 200 side. However, this call memo recording operation can also be applied to the case where the call is disconnected and the BT is sent to the telephone terminal 10A by a method other than steps S401 to S403 such as call termination. In this case, the BT is distributed to the source terminal 10A side and the transmission control unit 120 side by the reception distribution unit 112, and the transmission control unit 120 converts the BT transmitted from the reception distribution unit 112 to the reception detection function 121. And the switching instruction function 122 outputs a switching instruction signal to the transmission switching unit 111 so as to switch the transmission path from the circuit switching unit 113 side to the voice recognition device 200 side (step S502). When the switching instruction signal is input, the transmission switching unit 111 switches the transmission path to be connected to the voice recognition device 200 side.

  When the content of the call memo to be recorded is uttered after the utterance such as “memo”, for example, so as to record the call memo at the caller terminal 10A, a voice signal designating the call memo is sent from the transmission switching unit 111. It is sent to the speech recognition apparatus 200 (step S503). When the voice signal is input, the voice recognition device 200 determines the voice signal, performs processing such as converting the voice signal into text so as to record the call memo, and records the voiced voice signal in the call memo DB 210. To do.

  As described above, the voice signal from the source terminal 10A is connected to the instruction path on the voice recognition device 200 side between the RBT and the BT that are not uttered for the call at the source terminal 10A. Thus, it is possible to control the voice call from the caller terminal 10A and record the call memo. As described with reference to FIG. 3, these can effectively use the resources of each part of the telephone exchange apparatus 100 that processes the voice signal from the caller terminal 10A during the period when the voice for the call is not made.

  As described above, in the telephone terminal 10A connected to the telephone exchange device 100, there is no voice for a call, that is, no voice signal is transmitted from the telephone terminal 10A to the telephone terminal 10B, off-hook, hold, RBT, and During the BT, the voice signal from the telephone terminal 10A is detected by the reception detection function 121 of the transmission control unit 120, and the transmission switching unit 111 of the voice recognition device 200 side is detected by the switching instruction function 122 of the transmission control unit 120. By outputting the switching instruction signal so as to connect to the route, it is possible to control the voice call from the caller terminal 10A. Even when the transmission switching unit 111 is connected to the path on the voice recognition device 200 side, the voice signal from the destination terminal 10B is sent to the source terminal 10A. Never miss. Further, during a period when the telephone terminal 10A connected to the telephone switching apparatus 100 is not uttered for a call, each part of the telephone switching apparatus 100 that processes the voice signal from the caller terminal 10A is not used, and resources during this period are not used. Can be effectively used to control a call by utterance from the telephone terminal 10A. As a result, the user of the telephone terminal 10A connected to the telephone exchange device 100 can control the call by speaking and can improve the work efficiency of the telephone reception.

  As described above, according to the telephone exchange system and the telephone exchange apparatus, it is possible to perform processing based on an operation instruction by voice without affecting the telephone call.

  In addition, this invention is not limited to the above structure, A various deformation | transformation is possible. For example, in the above embodiment, the case where only one telephone terminal is connected to the telephone exchange device 100 has been described for the sake of convenience. However, a large number of telephone terminals may be connected to the telephone exchange device 100. In addition, many telephone terminals are configured to be connected to the telephone exchange device 100 via a PoE (Power Over Ethernet (registered trademark)) switch or the like if the telephone exchange device 100 is an IP. Also good. In the above embodiment, the telephone terminal 10A connected to the telephone switching apparatus 100 and the telephone terminal 10B on the circuit switching network 300 side connected to the telephone switching apparatus 100 have been described. Both the caller and the callee may be telephone terminals connected to the telephone exchange device 100. The telephone terminal may be a digital telephone, an IP telephone, or a soft phone. When the telephone exchange device 100 is IP, the telephone terminal is configured to be connected to the IP network instead of the circuit switching network. May be.

DESCRIPTION OF SYMBOLS 10A, 10B ... Telephone terminal, 100 ... Telephone switching apparatus, 110 ... Call connection part, 111 ... Transmission switching part, 112 ... Receive distribution part, 113 ... Line switching part, 114 ... Call control part, 115 ... Tone generation part, 120: Transmission rear part, 121: Reception detection function, 122: Switching instruction function, 200: Voice recognition device, 210: Call memo DB, 300: Circuit switching network.

Claims (7)

A telephone exchange system having a telephone exchange device connected to a communication network and connected to a telephone terminal, and a voice recognition device that generates a control signal based on a voice signal output from the telephone exchange device,
In the telephone exchange device,
A circuit switching unit that performs a circuit switching based on a control signal generated by the voice recognition device;
A receiving and distributing unit that distributes a voice signal transmitted from the circuit switching unit to the telephone terminal;
A transmission switching unit that switches a voice signal input from the telephone terminal to a call path connected to the circuit switching unit or an instruction path connected to the voice recognition device;
It is determined whether or not the voice signal distributed by the reception distribution unit is a tone signal, and when the voice signal is a tone signal, the connection path of the transmission switching unit is connected to the voice recognition device. And a transmission control unit for instructing switching so as to switch to the designated route.   The telephone exchange system according to claim 1, wherein the tone signal includes any one of a dial tone, an RBT (Ring Back Tone), a hold tone, and a BT (Busy Tone). A recording medium is connected to the voice recognition device,
2. The telephone exchange system according to claim 1, wherein the voice recognition device converts the voice signal output from the telephone exchange device into text and records the voiced voice signal on the recording medium.   The voice recognition device converts a voice signal related to call control input from the telephone terminal via the telephone switching device into a control signal for the circuit switching unit corresponding to the type of call control. The telephone exchange system according to claim 1. A telephone exchange device of a telephone exchange system, comprising: a telephone exchange device connected to a communication network and connected to a telephone terminal; and a voice recognition device that generates a control signal based on a voice signal output from the telephone exchange device. And
A circuit switching unit that performs a circuit switching based on a control signal generated by the voice recognition device;
A receiving and distributing unit that distributes a voice signal transmitted from the circuit switching unit to the telephone terminal;
A transmission switching unit that switches a voice signal input from the telephone terminal to a call path connected to the circuit switching unit or an instruction path connected to the voice recognition device;
It is determined whether or not the voice signal distributed by the reception distribution unit is a tone signal, and when the voice signal is a tone signal, the connection path of the transmission switching unit is connected to the voice recognition device. And a transmission control unit for instructing switching so as to switch to the designated route.   6. The telephone exchange apparatus according to claim 5, wherein the tone signal includes any one of a dial tone, an RBT (Ring Back Tone), a hold tone, and a BT (Busy Tone).   The voice recognition device converts a voice signal related to call control input from the telephone terminal via the telephone switching device into a control signal for the circuit switching unit corresponding to the type of call control. The telephone exchange device according to claim 5.

Images