JPH0530184A - Subscriber line management system - Google Patents

Abstract

PURPOSE:To effectively use two kinds of subscriber lines in an ISDN exchange storing the analog subscriber line and the I-interface subscriber line. CONSTITUTION:An I-interface terminal 2 and an analog terminal 3, which belong to the same subscriber A, are connected to the ISDN exchange 1. When the I-interface terminal 2 receives the request of the call/ incoming call of a transmission call with a line 5 connected to a remote subscriber Y while the terminal 2 is in the middle of the communication of a non-transmission call with a line 4 connected to a remote subscriber X, the exchange 1 exchanges a channel with the I-interface terminal 2 with the channel with the analog terminal 3. Thus the analog line and the I-interface line can effectively be used and an incoming call non-completion rate can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN exchange which accommodates both an I interface line and an analog line, and more particularly to a subscriber line management system and a communication line switching system.

[0002]

2. Description of the Related Art Conventionally, a subscriber having an ISDN I interface line and an analog line performs transparent call communication (G4 FAX, 64 kb / s digital communication) during non-transparent call communication (voice call, G3 FAX, etc.) over the I interface line. etc)
When attempting to make a call, the method of disconnecting or holding the call during communication and using the I interface line has been adopted. See the technical reference, “INS Net Service Interface,” No. 4, for the procedure of the hold.
Volume (Layer 3 circuit switching supplementary service), Nippon Telegraph and Telephone Corporation, published by The Telecommunications Association (1989) No. 16
See page, page 30. As related publicly known examples of the present technology, there are JP-A-2-168792, "Telephone system", and JP-A-2-51948, "Integrated service digital network switching system".

[0003]

In the above-mentioned conventional method, it is necessary to disconnect the call during communication once or hold it until the communication of the second call is completed, and the call is used by the I interface line. During the time, the analog line could not be effectively used even if the analog line was idle, which could cause inconvenience and waste of resources.

An object of the present invention is to provide an exchange that enables simultaneous communication of a non-transparent call and a transparent call.

Another object of the present invention is to provide a subscriber line management system which can effectively use analog lines and I interface lines.

Another object of the present invention is to provide a communication line switching system capable of reducing the rate of incompletion of incoming calls on analog lines and I interface lines.

[0007]

To achieve the above object, in the present invention, a call during communication is newly originated from an I interface line to an analog line or from an analog line to an I interface line. Add the function to transfer without changing. That is, according to the present invention, an exchange that accommodates both an analog subscriber line and an I interface subscriber line, and an analog subscriber line and an I subscriber line
Connected to the exchange through an interface subscriber line,
An exchange system consisting of at least one subscriber line group, wherein the subscriber line groups are managed by the same number,
When one call is being communicated using one of the analog subscriber line and the I interface subscriber line, a new call is communicated, and the subscriber line used by the communicating call is temporarily suspended or made empty. , A configuration is performed in which an in-communication call is transferred to the other type of subscriber line and a new call is communicated with the subscriber line that is held or vacant.

Further, according to the present invention, there is provided an exchange which accommodates both an analog subscriber line and an I interface subscriber line, and manages two kinds of subscriber lines as one subscriber line group under the same number. To provide an exchange.

Further, in the present invention, at least one subscriber line group having both an analog subscriber line and an I interface subscriber line and managed by the same number is connected to the exchange. When a new incoming call is generated while the group is communicating on the I-interface subscriber line, the number stored in the memory attached to the exchange, the subscriber line group number, and the subscriber line group list number are stored. The correspondence table and the subscriber line list are used to capture the vacant analog subscriber lines in this subscriber line group.

[0010]

With the above-described structure, the exchange switches the call during communication from the I interface line to the analog line or from the analog line to the I interface line without disconnecting the call. This allows the subscriber to use the newly vacant I interface line or analog line.

That is, a subscriber line group managed by the same number uses one of the analog subscriber line and the I interface subscriber line to make a new call while one call is being communicated. In this case, by using the correspondence table and subscriber line list in the exchange, other types of empty subscriber lines of the corresponding number are captured, and the subscriber line used by the call is put on hold or made empty, and communication is in progress. The call can be transferred to another type of subscriber line that has been captured, and a new call can be communicated with the subscriber line that is held or vacant.

[0012]

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

An embodiment of the present invention is shown in FIGS. 1 to 4, FIG. 6, FIG. 8, FIG. 9, FIG. 12 and FIG. FIG. 1 shows a state in which an I interface terminal and an analog terminal are respectively connected to an I interface subscriber line and an analog subscriber line belonging to the same subscriber line group. Hereinafter, for simplification of explanation, it is assumed that the subscriber A corresponds to this subscriber line group, but the subscribers may be plural or indefinite. Further, as will be described later, it goes without saying that the I interface terminal and the analog terminal may be a composite terminal.

FIG. 2 shows a state in which the transparent call is received from the remote subscriber Y while the subscriber A is communicating with the remote subscriber X for the non-transparent call. FIG. 3 shows a state in the middle of the switching operation of the communication line. Figure 4
It shows the connection state of the communication path after all the switching operations of the line during communication are completed.

FIG. 6 shows the sequence in this embodiment. FIG. 8 is used in this embodiment, is managed by the exchange, and is stored in the attached memory and corresponds to the "telephone number / subscriber line group number" correspondence table and "subscriber line group number / subscriber line group list number" 2 is a diagram showing the structure of a table and a subscriber line group list (analog subscriber line and I interface subscriber line). FIG. 9 is a flowchart showing the operation of the exchange.
FIG. 12 is a diagram showing a coding example of the switching request information element. FIG. 13 shows a subscriber line vacancy management table also stored in the memory of the exchange.

The operation of this embodiment will be described below with reference to these figures. FIG. 1 shows a state in which an I interface terminal 2 and an analog terminal 3 belonging to the same subscriber line group are connected to an ISDN exchange 1 via an I interface subscriber line 2'and an analog subscriber line 3 ', respectively. . Exchange 1
The inside of the I interface subscriber line accommodation device 1a, analog subscriber line accommodation device 1b, subscriber line concentrator 1c,
Call path switch 1d, interoffice line concentrator 1e, interoffice line accommodating device 1f, central processing unit of exchange (hereinafter, CPU)
1g, exchange memory 1h, hold sound source 6, call sound source 7
Composed of. The difference between the exchange 1 for implementing the present embodiment and the existing exchange is that the memory 1 will be described later.
It is data for a call control program stored in h and a line switching service that is newly added.

In FIG. 2, while the I interface terminal 2 is in a non-transparent call (first call, call number CR1) through the line 4 and the communication line 8 connected to the remote subscriber X, the line 5 is used. A state in which a transparent call (second call, eg, G4 FAX call, call number CR2) has arrived from the remote subscriber Y is shown. In this state, the subscriber A of the I interface terminal 2
Knows that the transparent call has arrived by receiving the "call setup" signal 13 ("call setup" (CR2) in sequence diagram 6) from the exchange 1.

At this time, when the subscriber A of the I interface terminal 2 accepts an incoming call from the remote subscriber Y, I
In response to the operation of the subscriber A, the interface terminal 2 adds a parameter indicating the line switching request and the call number of the call to be switched (hereinafter referred to as the switching call number) to the parameter of the normal "response" signal to the exchange 1. Signal 14 (“response” (switch request, CR1) (CR2) in FIG. 6) is returned. An example of coding the above parameters (switch request information element) is shown in FIG. In the information element of FIG. 12, an information element identifier (value is a switching request, 0011101 is set in octet 1).
0), the switching request content length is shown in octet 2, and the switching call number value is shown in octet 3 and after. Other than this, there is a method of using the facility information element.

FIG. 3 shows the operation of "switching the line during communication" when the exchange 1 receives the "response" signal 14. Exchange 1
Receives a "response" signal 14 (this is the flow in FIG. 9 (a)).
Corresponding to the "response" signal reception 24a in the flow 24 of the control program of the exchange 1 for the call number CR2 (new incoming call, second call) and the switching request parameter presence / absence determination 24b. If there is no switching request parameter,
Normal call control procedure processing 24c is performed. If there is a switch request parameter, the acquisition processing 24 of the analog subscriber line 3'in the empty state corresponding to the I interface subscriber line 2 '
d is performed according to the following procedure.

That is, first, using the "telephone number / subscriber line group number" correspondence table 21 shown in FIG. 8, the subscriber line corresponding to the subscriber A using the telephone number of the corresponding subscriber line group. Find the group number. Here, the value is set to sgn1. Next, "subscriber line group number / subscriber line group list number" correspondence table 22
Is used to obtain the subscriber line group list number sgln corresponding to the subscriber line group number sgn1. Then, the analog subscriber line list in the subscriber line group list 23 corresponding to the subscriber line group list number sgln is collected. The subscriber line numbers sn1, sn2 ,. ． On the other hand, a method of determining the availability of each subscriber line from the subscriber line availability management table 28 shown in FIG. 13 and determining the analog subscriber line 3'in the empty state (for example, search in list order) Yes, or specify using parameters on the "response" signal)
Ask in. The capture process 24d is performed in the above procedure.

Next, the call being communicated between the two lines (that is, the I interface subscriber line 2'and the analog subscriber line 3 ') is transferred. Therefore, in the exchange 1, the disconnection request (switching) message is sent from the control program with the call number CR2 to the control program with the call number CR1.
e. Here, the call number CR1 indicates the value of the switching call number sent to the exchange together with the switching request parameter.

Next, when a disconnection request (switching) message reception 25a is performed in the control program of the exchange 1 for the call number CR1 (flow 25 shown in FIG. 9B), first, the remote subscriber X The disconnection processing 25b of the communication path 8 between the line 4 and the I interface terminal 2 is performed. Next, connection processing 25c is performed on the line 4 to the holding sound source 6 on the communication path 10. Then, the B channel holding process 25d is performed. Then, a "disconnect" signal is sent 25e (Sequence FIG. 6).
"Disconnect" signal 15) of (1) is disconnected (layer-3 link is disconnected by "disconnect" signal 15). After that, when the "release" signal reception 25f is performed, the disconnection completion notification message transmission 25g is performed to the call control program of the call number CR2, and the "release completion" signal transmission 25h (flow- "release completion" signal 16 in FIG. )I do.

Next, when the disconnection completion notification message reception 24f is performed in the control program of the call number CR2, the line 5 and the I interface terminal 2 for the remote subscriber Y are received.
Is subjected to connection processing 24g on the communication path 9 and the B channel state is set to communication (B channel state setting processing 24h).
Further, a "response confirmation" signal transmission 24i ("response confirmation" signal 17 in FIG. 6) is transmitted to the I interface terminal 2.
Then, the call setting request message transmission 24j is performed to the call control program of the analog call, and the call of the call number CR2 is transited to the communicating state.

Now, the call control program of the exchange 1 for the analog call (flow 26 shown in FIG. 9C).
Then, when the call setting request message is received 26a, the analog subscriber line 3'is connected to the calling sound source 7 on the communication path 11 and the "ringing" signal is transmitted 26c ("ringing" in FIG. 6). Signal 18). It should be noted that this "ringing" signal may use a sound source different from a normal sound source to indicate that the call is transferred in the switching procedure.

Next, in FIG. 4, the analog terminal 3 operates as shown in FIG.
The operation when a call is answered in the call state is shown. When the analog terminal 3 responds (“off-hook” signal 19 in FIG. 6), the exchange 1 receives the “off-hook” signal 26d,
The sound sources 6 and 7 connected to the line 4 and the analog terminal 3 for the remote subscriber X are disconnected, and the connection processing 26 is performed to the line 4 and the analog terminal 3 through the communication path 12.
Then, the call with the remote subscriber X, which has been suspended, is resumed.

The above is a description of the configuration and operation of one embodiment of the present invention. Next, another implementation means as a second embodiment of the present invention will be described.

That is, in this embodiment, in the state shown in FIG. 2, the line of the first call is transferred to the analog line before the "answer" signal is returned to the second call. This embodiment is shown in FIGS.
And it demonstrates in full detail using FIG. FIG. 5 shows a state in which the non-transparent call and the transparent call are in a ringing state. Figure 7
Shows the sequence in this embodiment. Figure 1
6 is a coding example of the switching request parameter (feature activation information element) carried in the "additional information" signal in this procedure.

In the state shown in FIG. 2, the I interface terminal 2 sends the "additional information" signal 20 ("additional information" (switch request) (CR1) in sequence diagram 7) requesting the exchange 1 to transfer the line. Send out. At this time, unlike the procedure shown above, it is not necessary to indicate the switching call number. Therefore, instead of using the switching request parameter shown in FIG. It can be represented by an information element. The coding example is shown in FIG. In this information element, the information element identifier (value 00111001 is the feature activation) is shown in octet 1, the feature activation content length is shown in octet 2, and the feature identifier number (the value is a switching request) is shown in octet 3 and after. There is. That is, it is realized by arranging the feature identifier number corresponding to the switching request between the user and the network.

Upon receiving this signal, the exchange 1 receives the line 4 and the I interface terminal 2 for the remote subscriber X.
The call path 8 (FIG. 2) is disconnected, and the layer 3 link of the call is disconnected by the “disconnect” signal 15 (sequence diagram 7). Then, the exchange 1 sends the "release completion" signal 16 (sequence diagram 7) according to the procedure of the layer 3, and then connects the line 4 to the hold sound source 6 through the communication path 10 and
The call source 7 is connected to the analog terminal 3 corresponding to the analog subscriber line obtained from the table of FIG. ("Ringing" signal 18 in sequence diagram 7).
FIG. 5 shows two call states at this time. The first call (CR1) is ringing to the analog terminal 3,
The second call (CR2) is being called to the I interface terminal 2. Therefore, if the two calls are sequentially answered, both calls are in communication and the switching procedure is completed (that is, the state of FIG. 4).

In the above embodiment, the case where the remote subscriber Y receives a transparent call to the I interface terminal 2 has been described. On the contrary, the subscriber A makes a transparent call from the I interface terminal 2 to the remote subscriber Y. When making an outgoing call, it can be realized by transferring the line after performing the same procedure.

This case will be described as a third embodiment with reference to FIG. FIG. 14 shows a sequence in this embodiment. It is assumed that the subscriber A is communicating with the remote subscriber X at the I interface terminal 2. At this time, the subscriber A attempts to make a transparent call from the I interface terminal 2 to the remote subscriber Y. First, the I interface terminal 2 sends an "additional information" signal (similar to the "additional information" (switch request) (CR1) 20 in the sequence diagram 7) requesting the switching of the line to the exchange 1.

When the exchange 1 receives the "additional information" signal 29a on the basis of the control program of the call number CR1 shown in FIG. 14A, it performs the acquisition processing 29b of the empty analog interface in the same subscriber line group. (The processing content is the same as the previous embodiment). Next, a call path disconnection process 29c is performed on the call path 8 between the line 4 and the I interface terminal 2 for the remote subscriber X, and the line 4 is connected to the hold sound source 6 via the hold sound source 29d via the call path 10. Then, the B channel hold processing 29e is performed, and the "disconnect" signal transmission 29f is performed.

Then, the exchange 1 receives the "release" signal 2
At 9 g, the call setting request message transmission 29h and the "release completion" signal transmission 29i are performed to the analog call control program. In the call control program for the analog call shown in FIG. 14B, when the analog subscriber line receives the call setting request message 30a, the analog terminal 3 connects the calling sound source 7 to the analog terminal 3 by the calling sound source connection 30b on the communication path 11, The signal is transmitted and the ringing state is set. When receiving the "off-hook" signal 30d from the subscriber A, the call path connection processing 30e is performed. As a result, the transfer from the I interface to the analog is completed, and the empty I interface can be used for transmission.

Although not described here, it goes without saying that the switching procedure from the I interface to the I interface can be realized by the same procedure as described above. At this time, a "call setup" signal is used instead of the "ringing" signal 18, but this signal may be provided with an indication that it is a transfer call.

Further, the switching procedure from the analog line to the I interface can be realized by instructing the "response" signal or the "additional information" signal requesting the switching by the combination of the "hooking" signal and the special number dial. Since it is implicitly understood that there are only two calls on the analog subscriber line, a call in communication and a new call, the parameter corresponding to the switching call number is unnecessary.

Next, an embodiment of the terminal according to the present invention will be described. As a method of realizing this, there are a method of using two terminals, an I interface terminal and an analog terminal, and a method of using a composite terminal having the functions of both terminals. Here, the latter composite terminal method will be described with reference to FIGS. And FIG. 15 will be used. FIG. 10 shows an appearance of an embodiment of a compound terminal having a line switching function. FIG. 11 is a flowchart showing the operation of the terminal. FIG. 15 shows an embodiment of the internal configuration of the composite terminal. In the figure, each block shows the device and circuit components shown in the drawing.

The feature of the terminal of this embodiment is the line switching call control program and the call number table 50s stored in the storage circuit 50f in FIG. It is assumed that a transparent call is received while the non-transparent call is being communicated by the compound terminal 50.
At that time, an incoming call is displayed on the display 50b.
When the user presses the line switching function button 50c, the call control program (FIG. 11A) for the new call (CR2) of the composite terminal 50 performs the switching request message reception 51a. At this time, this program performs a call number (CR1) collection process 51b during communication from the call number table 50s stored in the memory circuit 50f, and adds a switching request parameter and a switching call number to the "response" signal to edit the signal. The process 51c is performed.
Then, the edited "response" signal transmission 51d is performed to the network. After that, this program receives a "response confirmation" signal 51e from the network, and further sends a switching notification message 51f to the call control program (FIG. 11 (b)) of the transparent call of the analog call to put it in the communicating state. Transition. When the call control program for the analog call receives the switching notification message 52a, it shifts from the empty state to the switching state.

Thereafter, an analog call is received as shown in FIG. At this time, the call control program for the analog call performs the "ringing" signal reception 52b and automatically performs the "off-hook" signal transmission 52c to the network because it is in the switching state. And at the same time, the speech path switch circuit 5
By controlling 0m, analog subscriber line 3'and handset 5
0a is connected. On the other hand, when the procedure of FIG. 7 is performed, it is as follows. It is assumed that a transparent call is received while the I interface terminal 50 is performing a non-transparent call communication. At that time, an incoming call is displayed on the display 50b. When the user presses the line switching function button 50c, the I interface terminal 50 adds the switching request display as a parameter to the "additional information" signal and returns it to the network. Subsequent procedures are performed by normal call control. These two procedures can be selected by the user by providing two types of buttons on the terminal.

The effect of the present invention will be described below with reference to FIG. FIG. 17 shows the state transition of the number of calls on the subscriber's I interface line and analog line in the present invention. For simplicity, the number of calls on the I interface line is limited to 1 here. State 32a (I
In the case where there is a non-transparent call on the interface line and the analog line is empty), incoming and outgoing 32b of the transparent call are impossible, but this can be realized by the switching procedure of the present invention.

[0040]

According to the present invention described in detail above, there is provided a subscriber line management system and a communication switching system for an exchange, which can effectively use an analog line and an I interface line and can reduce a call completion rate. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing operations of a terminal and an exchange when responding to a new incoming call.

FIG. 3 is a diagram showing operations of the terminal and the exchange when a new incoming call is in communication and the original call transits to an on-hold state.

FIG. 4 is a diagram showing a state in which an original call is switched to an analog line and two calls are in communication.

FIG. 5 is a diagram showing a state in which two calls are ringing according to another embodiment of the present invention.

FIG. 6 is a diagram showing an example of a sequence of a switching procedure according to the first embodiment of this invention.

FIG. 7 is a diagram showing an example of a sequence of another switching procedure.

FIG. 8 is a diagram showing an example of subscriber line group-related management data held by the exchange.

FIG. 9 is a flowchart showing an operation of the exchange when a call is received during communication.

FIG. 10 is a diagram showing an embodiment of a terminal for realizing the present invention.

FIG. 11 is a flowchart showing the operation of the terminal.

FIG. 12 is a diagram showing a format of a switching request information element.

FIG. 13 is a diagram of a subscriber line air blockage management table.

FIG. 14 is a flowchart showing an operation of the exchange when making a call during communication.

FIG. 15 is a diagram showing a configuration of a composite terminal.

FIG. 16 is a diagram showing a format of a feature activation information element.

FIG. 17 is a state transition diagram of an I interface subscriber line and an analog subscriber line.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... ISDN exchange for accommodating analog subscriber line and I interface subscriber line, 1a ... I interface subscriber line accommodating device, 1b ... Analog subscriber line accommodating device, 1c ... Subscriber line concentrator, 1d ... Call path switch , 1f ... Inter-station line accommodation device, 1g ... CPU of exchange, 1h ... Memory of exchange, 2 ... I interface digital terminal of subscriber A, 2 '... I interface subscriber line, 3 ... Analog terminal of subscriber A, 3 '... analog subscriber line, 4 ... line for remote subscriber X, 5 ... line for remote subscriber Y, 6 ... held sound source, 7 ... ringing sound source, 8 ... call path connecting line 4 and terminal 2, 9 ... A communication path connecting the line 5 and the terminal 2, 10 ... A communication path connecting the line 4 and the sound source 6, 11 ... A communication path connecting the sound source 7 and the terminal 3, 12 ... A communication path connecting the line 4 and the terminal 3 Talk line, 13 ... "Call setup" signal from switchboard to subscriber A by call number CR2, 14 ... "Response" signal indicating switching request from subscriber A by call number CR2, 14 '... Join by call number CR2 "Reply" signal from the person A, 15 ... "Disconnect" signal from the exchange by the call number CR1 to the subscriber A, 16 ... "Release complete" signal from the switch by the call number CR1 to the subscriber A, 17 ... Call number "Response confirmation" signal from the exchange to subscriber A by CR2, 18 ... "Ringing" signal to analog terminal, 19 ... "Off-hook" signal from analog terminal, 20 ... Switching request from subscriber A by call number CR1 "Additional information" signal indicating 21 ... "Telephone number / subscriber line group number" correspondence table, 22 ... "Subscriber line group number / subscriber line group list number" correspondence table, 23 ... Subscriber line group list ( analog Subscriber line and I interface subscriber line), 24 ... Flow of exchange for call number CR2 (new incoming call), 24a ... Receiving "response" signal, 24b ... Judgment of presence / absence of switching request parameter, 24c ... Normal call control procedure Processing, 24d ... Subscriber line capture processing, 24e ... Disconnection request (switching) message transmission, 24f ... Disconnection completion notification message reception, 24g ... Call path connection processing, 24h ... B channel state setting processing, 24i ... "Response confirmation" signal Transmission, 24j ... Call setting request message transmission, 25 ... Flow of exchange for call number CR1 (existing call in progress), 25a ... Disconnection request (switching) message reception, 25b ... Call path disconnection processing, 25c ... Hold sound source connection processing , 25d ... B channel hold processing, 25e ... "disconnect" signal transmission, 25f ... "release" signal reception, 25g ... complete disconnection End notification message transmission, 25h ... "release completion" signal transmission, 26 ... switch flow for analog call, 26a ... call setup request message reception, 26b ... call source connection processing, 26c ... "ringing" signal reception, 26d ... "off-hook""Signal reception, 26e ... Call path connection processing, 27 ... Switching request information element, 28 ... Subscriber line blockage management table, 29 ... Flow of exchange for call number CR1 (existing call during communication), 29a ..." Additional information (Switching) "signal reception, 29b ... subscriber line capture processing, 29c ... call path disconnection processing, 29d ... hold sound source connection processing, 29e ... B channel hold processing, 29f ..." disconnection "signal transmission, 29g ..." release "signal Receiving, 29h ... Call setup request message transmission, 29i ... "Release complete" signal transmission, 30 ... Switch flow for analog call, 30 ... call setup request message reception, 30b ... call source connection processing, 30c ... "ringing" signal reception, 30d ... "off-hook" signal reception, 30e ... call path connection processing, 31 ... feature activation information element, 32a ... "I interface""With non-transparent call / analog line empty" state, 32b ... Incoming or outgoing of transparent call in state 32a, 50 ... Composite terminal realizing the present invention, 50a ... Handset, 50b ... Display, 50c ... Line switching function button, 50d ... Push button, 50e ... Speaker, 50f ... Storage circuit, 50g ... Display control circuit, 50h ... Key identification circuit, 50i ... Voice generation circuit, 50j ... Central control device, 50k ... LAPD processing LSI, 50l ... Encoding / multiplexing Encoding circuit, 50m ... Channel switching circuit, 50n ... Layer 1 Logic LSI, 50o ... Analog signal generating circuit 50p ... Terminal interface circuit, 50q ... Analog signal monitoring device, 50r ... External device such as FAX device, 50s ... Call number table, 51 ... Call number CR2 (new incoming call) Flow, 51a ... Reception of switching request message, 51b ... Call number (CR1) collection processing, 51c ... Signal editing processing, 51d ... "Response" signal transmission, 51e ... "Response confirmation" signal reception, CR1 ... Subscriber A and remote subscription Call number for a non-transparent call with party X, CR2 ... Call number for a transparent call with subscriber A and remote subscriber Y.

Claims (15)

[Claims] 1. A switching system accommodating both an analog subscriber line and an I interface subscriber line, and at least one subscriber line group connected to the switching system via the analog subscriber line and the I interface subscriber line. And a subscriber line group is managed under the same telephone number, and one call is communicated using one of the analog subscriber line or the I interface subscriber line. In the meantime, when a new call communication is performed, the subscriber line used by the communicating call is once put on hold or idle, and the communicating call is transferred to the other subscriber line and put on hold or idle. A subscriber line management system characterized in that the new call is communicated through the subscriber line. 2. The subscriber line management system according to claim 1, wherein the one subscriber line is the I interface subscriber line and the other subscriber line is the analog subscriber line. . 3. The subscriber line management system according to claim 2, wherein when the new call is generated in the subscriber line group, a vacant line of the analog subscriber line is captured. 4. The subscriber line management system according to claim 3, wherein the new call is an incoming call to the subscriber line group. 5. The new call is an outgoing call from a terminal connected to the subscriber line group.
Subscriber line management method described. 6. The subscriber line management system according to claim 1, wherein the one subscriber line is the analog subscriber line and the other subscriber line is the I interface subscriber line. . 7. An exchange that accommodates both an analog subscriber line and an I-interface subscriber line, wherein the two types of subscriber lines are managed as one subscriber line group under the same telephone number. Exchange to do. 8. The exchange according to claim 7, wherein when an incoming call is made to at least one subscriber line group that has both the analog subscriber line and the I interface subscriber line and is managed by the same telephone number. , A communication line switching system characterized by capturing an empty line in the subscriber line group. 9. The communication line switching system according to claim 8, wherein when a new call is to be communicated during communication on the I interface subscriber line of the subscriber line group, a call already in use is used. B of the I interface subscriber line
The channel is once put on hold or idle, the active call is transferred to one of the empty analog subscriber lines in the same subscriber line group, and the held or idle B channel is used for the I interface. A communication line switching system characterized in that a new call is communicated through a subscriber line. 10. The communication line switching system according to claim 8, wherein when a new call is to be communicated during communication on the analog subscriber line of the subscriber line group, a call already in use is used. The analog subscriber line that had been held or vacant was temporarily suspended, and the in-communication call was transferred to one of the vacant I interface subscriber lines in the same subscriber line group, and the analog subscription that was suspended or vacant. A communication line switching system characterized in that a new call is communicated using a private line. 11. An I interface terminal connected to the I interface subscriber line used in the communication line switching system according to claim 9, wherein a non-transparent call is communicated through the I interface subscriber line. Means for displaying the arrival of the new call, input means for the user to input a line switching request, and a switching request parameter and a switching request parameter in the response signal to the exchange based on the line switching request input from the input means. An I interface terminal having means for adding a call number and transmitting. 12. A terminal connected to the subscriber line group used in the communication line switching system according to claim 9 or 10, which is in communication via the I interface subscriber line or the analog subscriber line. At the time, when a new incoming call is received, a means for notifying the user of the incoming call, an input means for the user to input a line switching request, and a line switching request input from the input means A terminal having means for adding a switching request parameter and a switching call number to a response signal to the exchange and transmitting the signal. 13. An analog interface terminal connected to the analog interface subscriber line used in the communication line switching system according to claim 10, wherein transparent call communication is performed via the analog interface subscriber line. Sometimes, a means for displaying the incoming of the new call, an input means for the user to input a line switching request, and a switching request parameter and a switching call in the response signal to the exchange based on the line switching request input from the input means. An analog interface terminal having means for adding a number and transmitting. 14. A switching system accommodating both an analog subscriber line and an interface subscriber line, and at least one subscriber line group connected to the switching system via the analog subscriber line and the interface subscriber line. In the exchange system, the subscriber line group is managed under the same telephone number, and one call is being communicated using one of the analog subscriber line or the interface subscriber line, The subscriber line used by the call during communication is once put on hold or vacant,
A communication line switching system characterized in that the call during communication is transferred to the other subscriber line for communication. 15. The communication line switching system according to claim 14, wherein the transfer from one subscriber line to the other subscriber line is performed according to a request from a user during communication. Line switching method.