JPH10224471A - Device and method for monitoring call connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor call connection without depending on a state monitor signal such as a busy tone sent out of a party side exchange. SOLUTION: When a communication path 24c is set between nodes 24a and 24b inside a private branch exchange(PBX) 10 by the call originating operation of subscriber private terminal equipment 12, a monitor time setting/monitoring circuit 30 starts counting time. Even when the response of party side terminal equipment 16 shows the setting of call connection, no response or occupied state, after the lapse of preset monitor time, the monitoring circuit 30 finishes the call connection by disconnecting the communication path 24c through a control circuit 26. When the extension of call connection or the end of call connection before the lapse of monitor time is desired, terminals 12 and 16 can send out an audio frequency signal. The audio frequency signal is detected by a signal detection circuit 32 of PBX and based on the audio frequency signal, monitor time control information is sent out to the monitor time setting/ monitoring circuit 30. Based on the monitor time control information, the monitor time setting/monitoring circuit 30 immediately extends communication path disconnection. Thus, the call connection can be monitored without depending on the state monitor signal sent from the party side exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call connection monitoring device and a call connection monitoring method.

[0002]

2. Description of the Related Art When a subscriber's local terminal sets up a call connection to a remote terminal via a remote exchange by a private branch exchange having an analog two-wire bidirectional circuit as a local line bidirectional interface, the remote terminal is connected to the local terminal. If it is in use, the other exchange sends a busy tone as a status monitoring signal to the private branch exchange. The private branch exchange detects a busy tone by a busy tone detection device connected to the local line bidirectional interface,
The information is transferred to the subscriber premises terminal to notify that the other terminal is in use. Also, when the other party terminal performs a disconnection operation from the call connection setting state, the other party exchange sends a busy tone to the subscriber local terminal via the private branch exchange in the same manner as described above, and the other party performs the disconnection operation. To inform.

[0003]

However, depending on the other party's exchange, a busy tone is sent out when the other party's terminal is busy, but when the other party's terminal disconnects from the call connection setting state, the busy tone is output. Some of the conventional private branch exchanges transmit signals other than the busy tone that cannot be detected by the conventional private branch exchange. In addition, there is a counterpart exchange that transmits a busy tone at a timing or frequency that cannot be detected by the conventional private branch exchange even if the busy tone is present. For this reason, in the related art, there is a problem in that a call cannot be connected to various counterpart terminal devices accommodated in the above-mentioned counterpart exchange.

The present invention solves the above-mentioned drawbacks of the prior art, and a call connection monitor for monitoring a call connection without depending on a state monitor signal of a partner terminal device such as a busy tone transmitted from a partner exchange. It is an object of the present invention to provide a private branch exchange having a device and a call connection monitoring method thereof.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a communication path accommodating a plurality of incoming and outgoing lines, and a call between the incoming and outgoing lines by controlling these communication lines. An exchange including control means for setting a connection, a signal detection means for detecting a voice frequency signal transmitted from the terminal device, and sets a monitoring time based on the detected voice frequency signal,
Monitoring time setting / monitoring means for monitoring the state of the call connection in the exchange during the set monitoring time. When the monitoring time elapses, the monitoring time setting / monitoring means causes the control means to terminate the call connection on the communication path.

According to the present invention, the monitoring time setting / monitoring means starts timing simultaneously with the setting of the communication path between the connection points in the exchange, and when the preset monitoring time elapses, the communication path between the connection points. Forcibly disconnect. Therefore, when the partner terminal device is in use, the call connection can be automatically terminated after the predetermined monitoring time has elapsed regardless of the type of busy sound.

According to the present invention, after the call connection is set, the subscriber's premises or the partner terminal can extend the call connection by transmitting a voice frequency signal. That is, the voice frequency signal is detected by the signal detection means in the exchange, and the monitoring time control information based on the detected voice frequency signal is used to set the monitoring time.
When transmitted to the monitoring means, the monitoring time is extended by the monitoring time setting / monitoring means, and the transmission of the monitoring time elapsed information to the control means is delayed. As a result, the call connection is extended by the time designated by the voice frequency signal.

According to the present invention, any one of the terminal devices can terminate the call connection before the elapse of the monitoring time by transmitting the audio frequency signal indicating the disconnection command. The voice frequency signal indicating the disconnection command is detected by the signal detecting means in the exchange like the voice frequency signal for extending the call connection, and sent to the monitoring time setting / monitoring means. Then, the monitoring time setting / monitoring means sets the monitoring time to 0 and immediately sends the monitoring time elapsed information to the control means, so that the communication path between the connection points is disconnected.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a switch provided with a call connection monitoring apparatus according to the present invention; FIG. 1 shows a configuration of a switching system in which a private branch exchange 10 according to an embodiment of the present invention sets up a call connection between a subscriber private terminal 12 and a partner terminal 16 accommodated in a partner exchange 14. It is a block diagram. The private branch exchange 10 is generally disposed on a subscriber premises and accommodates a plurality of subscriber premises terminals 12 such as telephones and a plurality of office lines 18 connected to a public telephone network, for example. Or a switching device for setting up a call connection between the subscriber premises terminals 12. Although a plurality of subscriber premises terminals 12 and office lines 18 are generally provided, only one each is shown in FIG. 1 to avoid complication of the drawing. The subscriber premises terminal device 12 is accommodated in an extension interface circuit 20, and the office line 18 is accommodated in an office bidirectional interface circuit 22. The communication path 24c between the connection point 24a of the extension interface circuit 20 and the connection point 24b of the local line bidirectional interface circuit 22 is a call connection such as a called party number received from the subscriber premises terminal 12 or the local line 18. It is set by the control circuit 26 in response to the setting request information.

The private branch exchange 10 according to the present invention does not require the busy tone detection circuit 28 of the private branch exchange 10 in the prior art call connection monitoring system shown in FIG. Time setting / monitoring circuit
30 and a signal detection circuit 32.

The monitoring time setting / monitoring circuit 30 is a private branch exchange.
A function of setting a monitoring time from when the communication path 24c is set between the connection points 24a and 24b in the network 10 until it is disconnected, and when the communication path 24c is set between the connection points 24a and 24b. Time measurement function and signal detection circuit
It has a function to change the monitoring time based on the monitoring time control information from 32. The signal detection circuit 32 detects and analyzes a voice frequency signal transmitted from the subscriber premises terminal device 12 or the counterpart terminal device 16, and transmits monitoring time control information based on the voice frequency signal to the monitoring time setting / monitoring circuit 30. Circuit. Even if the signal detection circuit 32 is replaced with a signal detection circuit capable of detecting a signal representing other numerical information such as an MF multi-frequency signal or a single-frequency signal, the same effect as the present invention can be obtained.

When the subscriber private terminal 12 performs a calling operation, the private branch exchange 10 receives it. Private branch exchange 10
Sends a call connection setting request to the destination exchange 14 in accordance with the called party number of the destination terminal 16 transmitted from the subscriber premises terminal 12, and forms a loop. The private branch exchange 10 sends the other party's number information to the other party's exchange 14 and establishes a connection point.
A communication path 24c is set between 24a and 24b. Connection point
When the communication path 24c is set between 24a and 24b, the monitoring time setting / monitoring circuit 30 starts measuring time. Remote exchange 14
Is the other terminal device when the other terminal device 16 is not in use.
When the destination terminal device 16 responds, a communication path 34c is set between the connection points 34a and 34b. In this way, between the subscriber premises terminal device 12 and the partner terminal device 16,
A call connection is set via the private branch exchange 10 and the destination exchange 14.

The monitoring time setting / monitoring circuit 30 determines whether a predetermined monitoring time has elapsed regardless of whether a call connection between terminals has been set by a response from the partner terminal device 16 or no response from the partner terminal device 16. Then, the monitoring time elapsed information is sent to the control circuit 26 of the private branch exchange 10. This allows the control circuit
26 disconnects the communication path 24c between the connection points 24a and 24b, and the private branch exchange 10 sends a busy tone to the subscriber local terminal 12. At that time, if the call has been connected, private branch exchange 10 sends a disconnection request to partner exchange 14 to open the loop. When receiving the disconnection request, the remote exchange 14 receives the disconnection request and sets the communication path 34c between the connection points 34a and 34b.
Is disconnected, and a busy tone is transmitted to the partner terminal device 16. Thus, the subscriber premises terminal device 12 and the partner terminal device
16 itself performs the disconnection operation and terminates the call connection.

The subscriber premises terminal device 12 or the partner terminal device
If any one of 16 wants to extend the call connection by extending the monitoring time set in advance, the audio frequency signal in a predetermined format should be transmitted using the push button dial etc. of the terminal device. Can extend the call connection. The format of the audio frequency signal is, for example, 1 in this embodiment.
If it is desired to extend the number of minutes, "# 1" is set, and if it is desired to extend the number of minutes, "# 2" is defined. This voice frequency signal is detected by a signal detection circuit 32 provided in the private branch exchange 10, and monitoring time control information based on the voice frequency signal is monitored by a monitoring time setting / monitoring circuit.
Send to 30. The monitoring time setting / monitoring circuit 30 extends the monitoring time set in advance based on the monitoring time control information.
In this way, the monitoring time setting / monitoring circuit 30
The transmission of the monitoring time elapsed information to 26 is delayed, and the call connection is extended.

The subscriber premises terminal device 12 or the counterpart terminal device 16 terminates the call connection before a predetermined monitoring time elapses by transmitting a predetermined voice frequency signal, for example, “# 0”. Can be. The audio frequency signal indicating the disconnection command is detected by the signal detection circuit 32, similarly to the audio frequency signal for extending the call connection. According to the detected audio frequency signal indicating the disconnection command, the monitoring time control information for setting the monitoring time to 0 is set to the monitoring time setting / monitoring circuit 30.
Sent to The monitoring time setting / monitoring circuit 30 sets the monitoring time to 0, and immediately sends the monitoring time elapsed information to the control circuit 28. Thus, the call connection is terminated before the predetermined monitoring time has elapsed.

When the subscriber local terminal 12 requests the setting of a call connection, a communication path 24c is forcibly set between the connection points 24a and 24b in the private branch exchange 10. for that reason,
When the remote terminal device 16 is in use, the subscriber premises terminal device 12 is switched to the remote switch during the preset monitoring time.
14 receives the busy tone transmitted. However, this busy tone does not contribute to the monitoring of the call connection at all, and the call connection is terminated in the same manner as described above when the monitoring time set by the monitoring time setting / monitoring circuit 30 elapses. Further, in this case, if the subscriber premises terminal device 12 transmits the audio frequency signal “# 0”, even if the partner terminal device is in use, immediately before the elapse of the monitoring time set in advance as described above, immediately The call connection can be terminated.

Although the embodiments of the present invention have been described using private branch exchanges, the present invention is not limited to private branch exchanges but can be effectively applied to general exchanges such as office exchanges.

[0018]

As described above, according to the present invention, the extension or termination of the call connection from the call connection setting state and the transition to the disconnection of the communication path corresponding to the busy state of the other terminal apparatus can be performed by the other exchange. A signal detection circuit in a private branch exchange that detects a speech frequency signal transmitted from a subscriber's private terminal apparatus or a remote terminal apparatus without depending on a state monitoring signal such as a busy tone transmitted from the private branch exchange to the private branch exchange. And a monitoring time setting / monitoring circuit. Therefore, if the present invention is utilized, a busy tone is transmitted when the other party's terminal is in use, but the other party's exchange sends a signal other than the busy tone during the disconnection operation, which cannot be detected by the private branch exchange. It is possible to set up a call connection to a partner terminal device accommodated in a partner switch that sends out a busy tone at a timing or frequency that cannot be detected by the switch, and has the effect of expanding the range of terminals to which the call can be connected.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a switching system to which a call connection monitoring method according to the present invention is applied.

FIG. 2 is a diagram illustrating an example of an exchange method in the related art.

[Explanation of symbols]

 10 Private branch exchange 12 Subscriber premises terminal 14 Remote switch 16 Remote terminal 18 Station line 20 Extension interface circuit 22 Station line bidirectional interface circuit 24a, 24b, 34a, 34b Connection point 24c, 34c Communication path 26 Control circuit 28 Busy tone Detection circuit 30 Monitoring time setting / monitoring circuit 32 Signal detection circuit

Claims (3)

[Claims] 1. A call connection monitoring device for monitoring a call connection in an exchange, comprising: signal detection means for detecting a voice frequency signal transmitted from a terminal device; and a monitoring time based on the detected voice frequency signal. And set
Monitoring time setting / monitoring means for monitoring the state of the call connection in the exchange during the set monitoring time, wherein the monitoring time setting / monitoring means sends the call to the exchange when the monitoring time elapses. A call connection monitoring device for terminating a connection. 2. An exchange comprising: a communication line accommodating a plurality of incoming / outgoing lines; and control means for controlling the communication line to set up a call connection between the incoming / outgoing lines. An audio frequency signal transmitted from the device is detected, a monitoring time is set based on the detected audio frequency signal, and when the set monitoring time elapses, the control means terminates the call connection in the communication path. An exchange comprising a call connection monitoring means. 3. A call connection monitoring method for monitoring a call connection in an exchange, comprising: detecting a voice frequency signal transmitted from a terminal device; setting a monitoring time based on the detected voice frequency signal; A call connection monitoring method comprising: monitoring a state of a call connection in the exchange during the set monitoring time; and terminating the call connection when the monitoring time has elapsed.