JPH0832576A - Terminal adaptor and its connection control method - Google Patents

Abstract

PURPOSE:To allow also a terminal adaptor main body to control a same call by allowing a control means conducting dialing/call reception processing to add an identification number corresponding to each call to a signal required for the call processing. CONSTITUTION:When a control section 26 of a terminal adaptor 12 makes a call from itself via a layer 172 control section 22, the control section 26 adds a predetermined fixed identification number to a control signal. When an incoming call is received, the control section 26 provides an identification not in use to each incoming call and applies call processing to the call. Furthermore, a control signal with an identification number provided by an external controller 11 resulting from a call by the controller 11 is processed based on its identification number. Thus, the call is controlled not only by the controller 11 but also by the adaptor 12 itself.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal adapter connected to an ISDN network and a connection control method for the terminal adapter.

[0002]

2. Description of the Related Art Generally, control of a terminal adapter capable of handling a plurality of calls, that is, control of calling, answering, activation of disconnection, etc., is performed by a signal from an external control device connected thereto. However, if the terminal adapter body has a telephone function, etc., or if data calls are to be made for testing, etc., a simple operation part should be provided on the terminal adapter body so that control can be performed from there. There is something that has become.

[0003]

However, in the conventional terminal adapter, the correspondence between the call and the control place,
That is, the external control device or the operation unit on the terminal adapter body was fixed. The control of the call made from the operation unit on the main body had to be performed from the operation unit of the main body, and the control of the call made by the instruction from the external device had to be performed from the external control device. there were. Specifically, when the terminal adapter body has a telephone function, the call of the telephone is made from the operation unit of the adapter body and the call is disconnected from the operation unit of the body. Further, when a data call is issued from the operation unit of the adapter body for a test or the like, it is necessary to control the call from the adapter body.

Therefore, in the conventional terminal adapter, it was not possible to make a call for one call using the operation part of the terminal adapter body and disconnect it from the external control device. Therefore, for example, if an incoming call is received when the external control device is not in operation, the timing of sending the response signal is delayed while waiting until the external control device is in operation, and the network disconnects due to a timeout. It was not possible to perform a control such as activating a response from the operation unit of the terminal adapter main body before the operation, and performing the control from the external control device after the external control device became the operating state. Further, if the program is stopped for some reason after making or receiving a call from the external control device, the operation unit on the terminal adapter body cannot be disconnected.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a terminal adapter and a connection control method therefor capable of performing mixed control of the same call not only from an external control device but also from the terminal adapter body. To provide.

[0006]

The terminal adapter of the present invention is provided with means for performing control necessary for call processing, which is connected to the ISDN network, and is capable of transmitting a control signal for call processing. In the terminal adapter having a control means for performing call processing and call reception processing, the control means includes means for adding an identification number corresponding to each call to a signal required for call processing. Characterize.

The means for adding the identification number is such that
It is possible to include means for adding a predetermined identification number to the call generated by the call from the own terminal adapter and adding an unused identification number to each call when the call is received.

According to the terminal adapter connection control method of the present invention, when a call is made from the own terminal adapter, a predetermined identification number is added to the control signal necessary for call processing by the identification number addition section of the terminal adapter, and the call is received. At the time of call, if it is a call setting signal, an unused identification number is added to the control signal necessary for call processing, and if it is not a call setting signal, the identification number already added to the corresponding call is added,
When responding from the local terminal adapter, the identification number corresponding to this call is added to the control signal required for call processing for the call waiting for a response, and the call required based on the identification number added for each call. It is characterized by performing processing.

[0009]

In the present invention, the signal for call control processed by the terminal adapter is provided with the identification number corresponding to the call.

When making a call using the input / starting means on the terminal adapter body, the information necessary for making a call is input from the input means, and the call start is performed using the starting means. At this time, the terminal adapter itself automatically adds a predetermined identification number corresponding to the call to the control signal. Then, while this call is present, this identification number is added to the signal from the input / activation means, and the control for this call can be performed on the terminal adapter main body.

When an incoming call is received, the terminal adapter displays the incoming call on the display unit on the adapter body, and the unused identification number is used as the identification number of this call in the incoming call display signal. Add and output to the external control device.
If there is no call controlled on the terminal adapter body, it is possible to answer or disconnect from the input means and the activation means on the terminal adapter body, and the control signal in that case is the call waiting for answer processing. The identification number of is automatically added by the terminal adapter itself. As in the case of making a call, this identification number is added to the control signal from the input / activation means during the existence of this call, and thereafter the control for this call can be performed on the terminal adapter body.

Further, the control signal from the external control device includes
The external control device itself can add an arbitrary identification number, and the terminal adapter can perform control corresponding to the identification number for each call added by the external control device.

Thus, it is possible to control any call including the call originated from the input means and the activation means on the terminal adapter body or the call answered by the input means and the activation means.

[0014]

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

FIG. 1 shows an outline of the configuration of a terminal adapter which is connected to an ISDN network according to an embodiment of the present invention and sends or receives data from a data transmitting / receiving device to or from an ISDN network (hereinafter referred to as a network). Is.

This terminal adapter 12 is an ISDN
Layer 1/2 control unit 22 connected to the basic interface 21, data input / output unit 23 connected to the external data transmitting / receiving device 15, display unit 24, key input unit 25, control unit 26, external external control device 11 And a control information input / output unit 27 connected to.

The terminal adapter 12 outputs the data input from the data transmitter / receiver 15 to the data input / output unit 23 to the information channel of the ISDN basic interface 21 via the layer 1/2 control unit 22. Alternatively, conversely, the data input from the information channel of the ISDN basic interface 21 is output to the data transmitting / receiving device 15. A control information input / output unit 27 inputs / outputs control signals from / to the external control device 11. The key input unit 25 is a unit that, when performing call control from the main body of the terminal adapter, inputs the called number, transmission capability, and the like required for call control, and initiates call origination, response, and disconnection. The display unit 24 displays information from the network and the status of the terminal adapter. The control unit 26 receives the input of the control information input / output unit 27 and the key input unit 25, controls the layer 3 of the ISDN basic interface 21,
The display instruction to the display unit 24, the signal transmission control to the control information input / output unit 27, and the activation to the data input / output unit 23 after the communication path is set are performed.

Next, FIG. 2 shows a block diagram of the control unit 26. The control unit 26 includes an identification number addition unit 31, an execution management unit 32, an identification number management unit 33, and a layer 3 control unit 3.
4, a display control unit 35 is provided.

The identification number adding section 31 performs a receiving process from the key input section 25 and adds an identification number to a signal from the key input section 25. Here, if a call is made from the key input unit 25 or if a response is made from the key input unit 25 to a call waiting for a response, the call has information corresponding to the call and the identification number. Hold for a while. The layer 3 control unit 34 uses the IS
It performs layer 3 control of the DN basic interface 21. The identification number management unit 33 associates the identification number with the call,
Manages the call status corresponding to the identification number. Further, the identification number is added to the signal from the layer 3 control section 34, the identification number is removed from the signal from the control information input / output section 27 and the key input section 25, and the signal is sent to the layer 3 control section 34. Display control unit 35
Then, a display instruction is given to the display unit 24. The execution management unit 32 manages the execution of the module unit that performs each process.

Input from the control information input / output unit 27 or the key input unit 25, the identification number adding unit 31
An example of the format of the signal after being processed in FIG. In this example, the signal is composed of an identification number, a signal type, and a portion indicating the signal content, each having one or more fields. The number and types of fields of signal contents differ depending on the signal type. FIG. 4 shows an example of a signal at the time of call initiation, and the signal content is the transmission capability required for call control between the terminal adapter 12 and the network.
Including the called number. The identification number is given by the external control device 11 when a call is made from the external control device 11 and by the terminal adapter 12 when an incoming call is made from the network. When making a call from the key input unit 25, the identification number addition unit 31 gives a predetermined fixed number.

Here, the feature of this embodiment is that the control unit 26 of the terminal adapter 12 is provided with means for adding an identification number to each call, and it is predetermined when a call is made from the own terminal adapter. A fixed identification number is added to the control signal, and when there is an incoming call, an unused identification number is given to each incoming call, and call processing is performed based on this identification number. The control signal of the identification number given by the external control device 11 when the external control device 11 calls is processed based on the identification number.

Here, FIG. 4 shows a control mode with the terminal adapter 12 and the external control device 11 to be realized by the present invention. Here, in the terminal adapter 12,
An operation unit 13 is provided, and a call control unit 14 is provided in the external control device 11.

In the connection shown in FIG. 4, focusing on one call, (a) when the call is controlled by the operation unit 13 on the main body of the terminal adapter 12, (b) the call is controlled externally. There are three cases where the control device 11 performs (c) the control of the call by both the operation unit 13 on the terminal adapter body and the external control device 11. For example, the control mode in which the response activation is performed on the main body of the terminal adapter 12 and the subsequent control is performed from the external control device is the mode of FIG. 4C.

When there are a plurality of calls, the combination of (a) and (b) is a combination of the above three forms.
It is (d), and the combination of (b) and (c) becomes (e). Since the operation unit 13 on the main body of the terminal adapter 12 controls only one call, there is no combination of (a) and (c).

In this embodiment, the ISDN basic interface of 2B + 1D channels is used, and the terminal adapter 12 can call only one channel.

Next, FIG. 5 shows the operation of assigning an identification number in the embodiment of the present invention as a processing sequence in the control unit 26 of the terminal adapter 12. The processing sequence of FIG. 5 shows under what conditions and where the identification number is added. (A) shows the addition of the identification number to the outgoing call, and (b) shows the addition of the identification number to the incoming call. The process for is shown.

The execution management unit 32 includes a control information input / output unit 27.
And the input from the key input unit 25 and the reception of the signal from the network are monitored (S41).

When a call setup signal from the network is received (S4
2), the signal is recognized by the layer 3 control unit 34,
Therefore, after performing an incoming call process such as sending a call setting acceptance signal to the network (S43), the identification number management unit 33 newly creates a correspondence between the call and an unused identification number and assigns the identification number. (S44, S45). The display of the incoming call is performed by the display control unit 35, the identification number addition unit 31, and the control information input / output unit 27. An incoming call display signal with an identification number as shown in FIG. 3 is sent to the identification number adding section 31 and the control information input / output section 27 (S46). Then, the call is held in the identification number management unit 33 and the identification number addition unit 31 in a response waiting state, and waits for receiving a response activation signal or a disconnection activation signal from the control information input / output unit 27 or the key input unit 25. . If the signal received from the network is not the call setup signal, it is a signal for an already existing call, so the identification number management unit 33 confirms which identification number the call is and adds an identification number (S47). , Processing for each call corresponding to the identification number (signal exchange with the external control device 11, the display unit 24, the key input unit 25, or the network, and state transition) is performed (S56). The control for each identification number can be performed in the layer 3 control unit 34 in exactly the same manner as the normal call control.

The external control device 11 is connected to the control information input / output unit 27.
When a signal is input from the identification number management unit 33
Decodes the identification number added to the received signal and performs processing for each identification number (S48, S5).
6).

The signal from the key input unit 25 is a call which is already controlled by the key input unit 25, that is, the key input unit 25.
If there is a call made from the caller or a call answered by the key input unit 25, the identification number is held in the identification number addition unit 31 and is held (S50, S).
51).

In other cases, in principle, a predetermined identification number (default identification number) is added to the signal from the key input section 25 by the identification number adding section 31 (S52, S55). . However, there is a call waiting for a response, that is, a call for which an incoming call display signal has been sent to the identification number addition unit 31 and has not been answered or disconnected,
The identification number corresponding to the call waiting for a response is added by the identification number addition unit 31 only when there is no call originated from the key input unit 25 and the input signal is response activation or disconnection activation (S50). ~ S54). Then, processing is performed for each added identification number (S56). When the signal input from the key input unit 25 is associated with the identification number, the same identification number is continuously added to the signal from the key input unit 25 while the call is present.

The identification number is given in correspondence with the call, not at the location where the signal of the key input unit 25 or the control information input / output unit 27 is input. Therefore, by utilizing the rule of the identification number given to the signal from the key input unit 25, the external control device 11 and the key input unit 25 can be used.
The control from is mixed. That is, by outputting a signal having a default identification number given to the signal from the key input unit 25 from the external control device 11, for example, the key input unit 25 is used to make a call and the subsequent control is performed. It is possible to perform the control from the external control device 11, or conversely, to make a call from the external control device 11 and to perform subsequent control from the key input unit 25. This is to disconnect from the key input unit 25 when the external control device 11 can only partially perform call control, or when the external control device 11 becomes abnormal and cannot disconnect the call. It will be possible.

FIGS. 6A and 6B show an example of the sequence of connection and disconnection. (A) shows a connection sequence, and (b) shows a disconnection sequence. In FIG. 6, there are incoming calls for two channels (for convenience, they are distinguished as B1 and B2), and a response is activated from the key input unit 25 for the first incoming call, and the second incoming call is made. In response to this, a response activation is performed from the external control device 11. Further, the external control device 11 performs disconnection activation for two calls. In addition, in order to simplify the explanation,
It is written that the layer 1/2 control unit 22 is omitted and the control unit 26 directly receives a signal from the network. In addition, the display unit 24
The key input unit 25, the control information input / output unit 27, and the external control device 11 are integrally written. Also, the signals entered were limited to important ones. Display unit 24 and external control device 11
In general, the signal to (1) is actually sent from the control unit 26 as a signal indicating a finer state.

The call setting signal (B1) is transmitted from the network to the layer 1/2.
When the control unit 26 receives via the control unit 22, the control unit 2
6 is a layer 1 that provides a call setup acceptance signal corresponding to the call setup signal.
/ 2 to the network via the control unit 22. This is to prevent disconnection from the network due to timeout. At this point, it is also possible to check the communication possibility by the contents of the call setting signal. Then on the signal for this call,
The identification number "11" is associated. This correspondence does not change during the life of this call. Then, the incoming call display is sent to the external control device 11 via the display unit 24 and the control information input / output unit 27.

When the operator activates the response from the key input unit 25, the key input unit 25 sends a response activation signal to the control unit 26. The control unit 26 confirms that there is no call currently being controlled from the key input unit 25 and that the signal from the key input unit 25 is a response activation signal, and identifies the call currently waiting for a response to the signal. The number "11" is added and the process corresponding to the identification number is performed. The processing in this case is to send the response signal to the network via the layer 1/2 control unit 22. In the above case, for example, the control unit 26 has a table that associates the identification numbers with the calls, in order to determine whether or not there is a control signal from the key input unit 25.
It is possible to confirm that the identification number added as a default to the signal from the key input unit 25 is not in the table.

When the second call setup signal (B2) is received from the network, the call setup acceptance signal is sent to the network through the layer 1/2 control unit 22 as in the case of B1 and then this call is received. The identification number "12" is associated with the signal for. The incoming call display is sent to the external control device 11 via the display unit 24 and the control information input / output unit 27. In the case of FIG. 6, the control unit 26 receives a response activation signal having the identification number “12” from the external control device 11 via the control information input / output unit 27, and performs a process corresponding to the identification number “12”, that is, a response. Sends signals to the network.

After connecting the two information channels and performing communication in this way, the control unit 2 sends two disconnection activation signals having the identification numbers "11" and "12" from the external control device.
6 is received via the control information input / output unit 27. Then, a process corresponding to each identification number, here, a control of sending a disconnection signal to the network via the layer 1/2 control unit 22 is performed.

As described above, the disconnection activation for the call answered by the key input unit 25 on the main body of the terminal adapter 12 can also be performed from the external control device 11.

Next, FIG. 7 shows an outline of a sequence in the case where the external control device 11 performs the call disconnection activation when the call activation is performed from the key input unit 25. Also in this figure, the same simplification as in FIG. 6 is made.

When the operator activates a call in the key input unit 25, the control unit 26 receives a call activation signal from the key input unit 25. The control unit 26 adds an identification number (“99” in this case) to be added as a default to the signal from the key input unit 25, and performs processing corresponding to the identification number.
That is, the call setting number is sent to the network via the layer 1/2 control unit 22.

When the response signal is received from the partner terminal, the communication state is set. In this example, the control unit 26 knows that the response signal received from the network is a call from the key input unit 25, and therefore the response display signal is sent only to the display unit 24. Of course, it may also be sent to the external control device 11.

After performing the communication, the control unit 26 receives the disconnection activation signal having the identification number “99” from the external control device 11 via the control information input / output unit 27. The control unit 26 sends a process corresponding to this identification number, that is, a disconnection signal to the network. The external control device 11 has a key input unit 25.
Since the identification number when calling from is predetermined as "99", the identification number "99" can be added to the disconnection activation signal. In this way, the control of the call transmitted from the key input unit 25 is controlled by the external control device 11
Can also be done from

FIG. 7 shows a case where a call is made from the key input unit 25, but the identification number "99" is sent from the external control device 11.
It is also possible to make a call from the external control device 11 by sending a call activation signal to which is added, and to perform subsequent control from the key input unit 25.

In this embodiment, the key input unit 2
Although an example in which the control unit 26 adds the identification number to the signal from 5 has been shown, it is also possible to add it to the key input unit 25. In that case, the key input unit 25 controls whether to add either the default identification number or the identification number of the answered call.

In the present embodiment, the case of the terminal adapter having the ISDN basic interface is shown, but the case of the terminal adapter having the primary group interface can be similarly realized. In this case, multiple external control devices can be connected to the terminal adapter, and the terminal adapter responds to any identification number added to the control signal from the external control device by the identification number and the call. It is possible to decode the identification number from the table and perform call processing for each call (each identification number).

The identification number added to the control signal for each call when a call is made from the external control device may be determined in advance for the external control device.

[0047]

As described above, according to the present invention, by adding an identification number corresponding to a call to a signal such as a call initiation, a response initiation, etc., not only from the external control device but also from the terminal adapter body. From now on, call control can be performed,
In addition, these controls can be mixed for one call, and the call originating from the control unit of the terminal adapter body can also be controlled from the external control device, or the control unit of the terminal adapter body can be controlled. There is an advantage that the call responded with can be controlled also from the external control device.

[Brief description of drawings]

FIG. 1 is a block diagram of a terminal adapter according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a control unit of the terminal adapter according to the embodiment of the present invention.

FIG. 3 is an example of a signal format used in the embodiment.

FIG. 4 is a diagram showing a control mode realized in the embodiment of the present invention.

5A and 5B are flowcharts showing an outline of an identification number addition processing sequence in the control unit of the embodiment.

6A and 6B are diagrams showing an example of an incoming call and disconnection sequence according to the embodiment.

FIG. 7 is a diagram showing an example of a calling and disconnecting sequence according to the embodiment.

[Explanation of symbols]

 11 External Control Device 12 Terminal Adapter 13 Terminal Adapter Operation Unit 14 External Control Device Call Control Unit 21 ISDN Basic Interface 22 Layer 1/2 Control Unit 23 Data Input / Output Unit 24 Display Unit 25 Key Input Unit 26 Control Unit 27 Control Information Input / output unit 31 Identification number addition unit 32 Execution management unit 33 Identification number management unit 34 Layer 3 control unit 35 Display control unit

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[Procedure amendment]

[Submission date] March 16, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

Next, the operation of assigning an identification number in the embodiment of the present invention is shown in FIGS . 5 and 6 as a processing sequence in the control unit 26 of the terminal adapter 12. FIG. 5 Contact
6 and FIG. 6 show under what conditions and where the identification number is added . FIG. 5 shows the addition of the identification number to the outgoing call and FIG. 6 shows the addition of the identification number to the incoming call . The process is shown.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

FIG. 7 shows an example of the sequence of connection and disconnection. FIG. 7 shows a connection sequence, and FIG. 8 shows a disconnection sequence. In FIGS. 7 and 8 , 2
There is an incoming call for one channel (for convenience, B1, B2
The key input unit 25 responds to the first incoming call, and the external controller 11 responds to the second incoming call. further,
The external control device 11 performs disconnection activation for two calls. In addition, in order to simplify the explanation, layers 1/2
The control unit 22 is omitted, and it is written that the control unit 26 directly receives a signal from the network. Further, the display unit 24, the key input unit 25, the control information input / output unit 27, and the external control device 11
Was written as one. Also, the signals entered were limited to important ones. As a signal to the display unit 24 and the external control device 11, a signal indicating a more detailed state is actually sent from the control unit 26 in general.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

When the second call setup signal (B2) is received from the network, the call setup acceptance signal is sent to the network through the layer 1/2 control unit 22 as in the case of B1 and then this call is received. The identification number "12" is associated with the signal for. The incoming call display is sent to the external control device 11 via the display unit 24 and the control information input / output unit 27. In the case of FIGS . 7 and 8, the control unit 26 receives a response activation signal having the identification number “12” from the external control device 11 via the control information input / output unit 27, and performs processing corresponding to the identification number “12”. That is, the response signal is sent to the network.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

Next, FIG. 9 shows an outline of the sequence in the case where the external control device 11 performs the call disconnection activation when the call activation is performed from the key input unit 25. Also in this figure,
7 and FIG. 8 have the same simplifications.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

Although FIG. 9 shows the case where a call is made from the key input unit 25, the identification number "99" is sent from the external control device 11.
It is also possible to make a call from the external control device 11 by sending a call activation signal to which is added, and to perform subsequent control from the key input unit 25.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a block diagram of a terminal adapter according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a control unit of the terminal agptor according to the embodiment of the present invention.

FIG. 3 is an example of a signal format used in the embodiment.

FIG. 4 is a diagram showing a control mode realized in the embodiment of the present invention.

FIG. 5 is a flowchart showing an outline of an identification number addition processing sequence in the control unit of the embodiment.

FIG. 6 is a flowchart showing an outline of an identification number addition processing sequence in the control unit of the embodiment.

FIG. 7 is a diagram showing an example of an incoming call and disconnection sequence according to the embodiment.

FIG. 8 is a diagram showing an example of an incoming call and disconnection sequence according to the embodiment.

FIG. 9 is a diagram showing an example of a calling and disconnecting sequence according to the embodiment.

[Explanation of Codes] 11 External control device 12 Terminal adapter 13 Terminal adapter operation part 14 External control device call control part 21 ISDN basic interface 22 Layer 1/2 control part 23 Data input / output part 24 Display part 25 Key input part 26 Control unit 27 Control information input / output unit 31 Identification number addition unit 32 Execution management unit 33 Identification number management unit 34 Layer 3 control unit 35 Display control unit

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 6]

[Figure 5]

[Figure 7]

[Figure 8]

[Figure 9]

Claims (3)

[Claims] 1. An external control device, which is connected to an ISDN network and performs control necessary for call processing, is connected to an external control device capable of transmitting a control signal for call processing, and makes a call processing and a call processing. In the terminal adapter, the control means includes means for adding an identification number corresponding to each call to a signal required for call processing. 2. A means for adding an identification number is such that, when a call is made, a predetermined identification number is added to a call originated by a call from the local terminal adapter, and when a call is received, an unidentified call The terminal adapter of claim 1, including means for adding a use identification number. 3. A connection control method for a terminal adapter, which is provided between an ISDN network and an external control device capable of transmitting a control signal for call control, and which performs control necessary for call processing, comprising: When a call is made from the adapter, a predetermined identification number is added to the control signal required for call processing, and when a call is received, an unused identification number is added to the control signal required for call processing when it is a call setup signal. When it is not a call setting signal, the identification number already added to the corresponding call is added, and when the local terminal adapter responds, the identification number corresponding to this call is added to the call waiting for a response. A connection control method for a terminal adapter, characterized by performing necessary call control based on an identification number added to a signal for each call.