JP4176274B2 - Telephone control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telephone control apparatus that accommodates an ISDN line.
[0002]
[Prior art]
Conventionally, when a telephone control apparatus that accommodates an ISDN line makes an in-band service from the ISDN network even when the other party is busy, the call control device that accommodates the ISDN line does not disconnect the line communication path. Can be notified of the voice by the in-band service provided from the ISDN network. In addition, when a redial request is detected from the caller under these conditions, the line can be disconnected and reconnected. The in-band service is a service for notifying the caller of guidance or the like from the ISDN network.
[0003]
In addition, when the telephone control device is requested for a disconnection notification from an ISDN network that does not provide an in-band service, if the caller maintains the communication path with the ISDN line, the caller hears silence and feels uncomfortable. The line was opened and the caller was allowed to listen to the busy sound by connecting an internal sound source (busy sound) held by the telephone control device.
[0004]
[Problems to be solved by the invention]
When a conventional telephone control device receives a disconnection notification from an ISDN network that does not provide an in-band service, the line is once opened. Therefore, when a caller performs a redial operation, an ISDN line accommodated by the telephone control device is connected. Since there is no guarantee that there is always an empty line, the redial function may not work.
[0005]
The present invention has been made to solve such a conventional problem, and can reliably operate the redial function even when receiving a disconnection notification due to the other party busy from an ISDN network that does not provide an in-band service. It is to provide a telephone control device.
[0006]
[Means for Solving the Problems]
The telephone control apparatus according to the present invention is a telephone control apparatus for controlling connection between a communication terminal and an ISDN line, and is a communication path switch between ISDN message analysis means for analyzing a message notified from the ISDN line, an internal sound source and the communication terminal. An internal sound source connection means for connecting via the communication terminal, and a redial operation means for operating a redial function when a redial request is detected from the communication terminal, and the ISDN message analysis means for the transmission from the communication terminal to the ISDN line When a disconnect message is received from the ISDN line and it is determined from this message that there is no in-band service, the internal sound source connection means connects the internal sound source to the communication terminal to notify the busy tone, and when a redial request is received from the communication terminal, Redial operation means has a configuration to open and reconnect the ISDN line That.
[0007]
With this configuration, when a communication terminal makes a call to a busy party and receives a disconnect signal from an ISDN network that does not provide an in-band service, the communication terminal notifies the busy tone from the internal sound source and maintains the line. When a redial request is received from the communication terminal, the redial function can be operated reliably by opening and connecting the ISDN line through a series of operations.
[0008]
The telephone control apparatus of the present invention is a telephone control apparatus for controlling connection between a communication terminal and an ISDN line, and is a call between ISDN message analysis means for analyzing a message notified from the ISDN line, an internal sound source and the communication terminal. An internal sound source connection means for connecting via a path switch, and an automatic redial operation means for automatically operating the redial function after a predetermined time when receiving a disconnection notification during the other party's talk. When a disconnect message is received from the ISDN line in response to an outgoing call to the ISDN line, and it is determined that there is no in-band service, the internal sound source connection means connects the internal sound source to the communication terminal to notify the busy tone and The automatic redial operation means is configured to open and reconnect the ISDN line after a time. .
[0009]
With this configuration, when a communication terminal makes a call to a busy party and receives a disconnect signal from an ISDN network that does not provide an in-band service, the communication terminal notifies the busy tone from the internal sound source and maintains the line. The redial function can be surely operated by automatically opening and connecting the ISDN line after a certain time using an internal timer in a series of operations.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
[0011]
FIG. 1 is a block diagram showing an embodiment of a telephone control apparatus according to the present invention. In the figure, a telephone control device 1 connects and controls an ISDN line 2 and a telephone 3 as a communication terminal. The ISDN line 2 is connected to the ISDN network 4, and the other party's general telephone 5 is connected to the ISDN network 4.
[0012]
The telephone control device 1 includes an internal sound source 11 for notifying the telephone 3 of a tone, a communication path switch 12 for switching and connecting the telephone 3 and the ISDN line 2, and a central control unit which is a control means for switching and connecting the communication path switch 12 13.
[0013]
The central control unit 13 connects the ISDN message analysis means 13a for analyzing the message notified from the ISDN line 2, the ISDN line control means 13b for instructing disconnection and connection of the ISDN line 2, the telephone set 3 and the internal sound source 11 to the communication path. Internal sound source connection means 13c connected via the switch 12, redial operation means 13d for operating the redial function when a redial request from the telephone 3 is detected, and redial operation is automatically started using an internal timer. An automatic redial operation means 13e, a redial memory 13f for storing dials from the telephone 3, and an internal timer control means 13g are provided.
[0014]
Next, the operation of the present embodiment will be described. First, the operation procedure of the redial control when the other party is talking when the ISDN line is transmitted will be described with reference to the sequence diagram shown in FIG.
[0015]
When the telephone control device 1 receives a call request from the telephone 3 (step S1) and receives a dial which is the telephone number of the other party (step S2), it stores this dial in the redial memory 13f (step S3). Then, a “SETUP” message is transmitted to the ISDN network 4 via the ISDN line 2 to request transmission (step S4).
[0016]
When the ISDN network 4 receives the call request, the ISDN network 4 transmits a “CALL PROC” message indicating that the call has been received to the telephone control device 1 (step S5). DISC "message is transmitted (step S6).
[0017]
Here, assuming that the ISDN network 4 has set “in-band service is not provided” in the “progress identifier” information element of the “DISC” message, when the telephone control apparatus 1 receives the “DISC” message, the ISDN message analysis is performed. The “progress identifier” information element is searched by means 13a, and it is determined whether or not there is an “in-band service” (step S7).
[0018]
If it is determined that there is no in-band service, the busy tone (BT) of the internal sound source 11 is connected to the telephone 3 by the internal sound source connection means 13c without transmitting the “RELEASE” message to this line (step S8). As a result, the caller of the telephone 3 listens to the busy tone.
[0019]
Next, when the telephone control device 1 receives a redial request from the telephone 3 (step S9), the redial operation means 13d first changes the connection of the telephone 3 to the dial tone (DT) of the internal sound source 11 (step S10). A “RELEASE” message is transmitted to the ISDN line 2 (step S11).
[0020]
When receiving this message, the ISDN network 4 notifies the telephone control device 1 of a “RELEASE COM” message (step S12). Upon receiving this message, the telephone control device 1 reads the dial stored in the redial memory 13f (step S13), edits it into a “SET UP” message, and transmits it to the ISDN network 4 (step S14). Thereby, it is possible to make a call to the general telephone 5 again.
[0021]
In this way, the telephone control device 1 can send a busy tone to the caller's telephone even if the reason indicator that the other party is busy is received from the ISDN line 2 and the progress identifier is not in-band service. Then, it is possible to reliably redial in response to a redial request.
[0022]
Next, using the sequence diagram shown in FIG. 3, the operation procedure of the automatic redial control when the other party is talking at the time of ISDN line transmission will be described.
[0023]
When the telephone control device 1 receives a call request from the telephone 3 (step T1) and receives a dial which is the telephone number of the other party (step T2), it stores this dial in the redial memory 13f (step T3). Then, a “SETUP” message is transmitted to the ISDN network 4 via the ISDN line 2 to request transmission (step T4).
[0024]
When the ISDN network 4 receives the call request, it transmits a “CALL PROC” message indicating that the call has been received to the telephone control apparatus 1 (step T5). When the destination general telephone 5 recognizes that it is busy, DISC "message is transmitted (step T6).
[0025]
Here, assuming that the ISDN network 4 has set “in-band service is not provided” in the “progress identifier” information element of the “DISC” message, when the telephone control apparatus 1 receives the “DISC” message, the ISDN message analysis is performed. The “progress identifier” information element is searched by means 13a, and it is determined whether or not there is “in-band service” (step T7).
[0026]
If it is determined that there is no in-band service, the busy tone (BT) of the internal sound source 11 is connected to the telephone 3 by the internal sound source connection means 13c without transmitting the “RELEASE” message to this line (step T8). As a result, the caller of the telephone 3 listens to the busy tone.
[0027]
Next, the telephone control device 1 sets a redial transmission timer by the internal timer control means 13g (step T9). When this timer expires after a certain time, a “RELEASE” message is automatically transmitted to the ISDN line 2 (step T10).
[0028]
When the ISDN network 4 receives this message, it notifies the telephone control apparatus 1 of a “RELEASE COM” message (step T11). Upon receiving this message, the telephone control device 1 changes the connection of the dial tone (DT) of the internal sound source 11 to the telephone 3 (step T12), reads the dial stored in the redial memory 13f (step T13), and sets “SET An "UP" message is edited and transmitted to the ISDN network 4 (step T14). Thereby, it is possible to make a call to the general telephone 5 again.
[0029]
As described above, the telephone control device 1 can send a busy tone to the caller's telephone 3 even if the ISDN line 2 displays the reason that the other party is busy and the progress identifier is not in-band service. And redialing can be automatically performed without the caller's operation.
[0030]
【The invention's effect】
As described above, according to the present invention, even if the ISDN line does not provide an in-band service, a busy tone can be transmitted to the caller's telephone when the call destination is busy, and the ISDN line can be maintained. Thus, it is possible to obtain a telephone control device that can prevent the line from being used for other call connections and reliably realize the redial function.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a telephone control apparatus according to the present invention. FIG. 2 is an explanatory diagram of the operation of redial control during a call to the ISDN line. FIG. Operation explanation of automatic redial control during middle time [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Telephone control apparatus 2 ISDN line 3 Telephone 4 ISDN network 5 General telephone 11 Internal sound source 12 Communication path switch 13 Central control part 13a ISDN message analysis means 13b ISDN line control means 13c Internal sound source connection means 13d Redial operation means 13e Automatic redial operation means 13f Redial memory 13g Internal timer control means

Claims (2)

A telephone control device for controlling connection of a communication terminal and an ISDN line,
ISDN message analysis means for analyzing a message notified from the ISDN line;
An internal sound source connection means for connecting the internal sound source and the communication terminal via a communication path switch;
Redial operation means for operating a redial function when a redial request is detected from the communication terminal;
When the ISDN message analyzing means receives a disconnect message from the ISDN line in response to a call from the communication terminal to the ISDN line, and determines that there is no in-band service from the message, the internal sound source connecting means A telephone control device, wherein the internal sound source is connected to a terminal to notify a busy tone, and when a redial request is received from the communication terminal, the redial operation means opens and reconnects the ISDN line. A telephone control device for controlling connection of a communication terminal and an ISDN line,
ISDN message analysis means for analyzing a message notified from the ISDN line;
An internal sound source connection means for connecting the internal sound source and the communication terminal via a communication path switch;
An automatic redial operation means that automatically activates the redial function after a predetermined time when receiving a disconnection notice during the other party's talk,
When the ISDN message analyzing means receives a disconnect message from the ISDN line in response to a call from the communication terminal to the ISDN line, and determines that there is no in-band service from the message, the internal sound source connecting means A telephone control device, wherein the internal sound source is connected to a terminal to notify a busy tone, and the automatic redial operation means opens and reconnects the ISDN line after a predetermined time.

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