JPH03238960A - Call waiting system - Google Patents

Abstract

PURPOSE:To attain registration and release even when a subscriber is busy by allowing an ISDN subscriber terminal equipment itself to store the registration and release of the call waiting service. CONSTITUTION:A subscriber terminal equipment 200 is provided with a notice means 22 notifying a call waiting service registration state of a registration means 21 of its own terminal equipment in response to an additional call setting message to an electronic exchange 100 and the electronic exchange 100 is provided with a control means 12 validating a service execution means 13 in response to the notice from the notice means 22. When a subscriber A is busy with a subscriber B and a subscriber C is going to reach the subscriber A, the presence of the call waiting service of the subscriber A is confirmed by an additional call control message (INFORMATION MESSAGE) because of the busy state of the subscriber A. Even when the subscriber is busy, the registration and release of the call waiting service are implemented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to call waiting means between an electronic exchange capable of ISDN subscriber control and an ISDN subscriber terminal connected thereto.

〔overview〕

The present invention provides a means for registering a call waiting service in a subscriber terminal in a call waiting means incorporated in an ISDN network, so that the call waiting service can be registered and canceled even when the subscriber is on a call. It was made so that it could be done.

[Conventional technology]

In the conventional example, call waiting was registered in advance in the main memory of the electronic exchange using an input/output terminal connected to the electronic exchange. If the subscriber received a call while the subscriber was busy, the electronic exchange confirmed the call waiting registration and connected the tone to the subscriber. The subscriber heard the tone and learned that a second call had arrived, and performed a call waiting service by hooking the subscriber.

FIG. 3 is a diagram showing the configuration of the conventional example. Subscriber A registers the call waiting service in the main storage device 30 in advance using the input/output terminal 40 connected to the central processing unit 20. When subscriber C attempts to receive a call to subscriber A while subscriber A is on the phone with subscriber B, the central processing unit 20 performs call waiting from the subscriber memory 1 prepared for subscriber A. I was sure that I had registered the service.

[Problem to be solved by the invention]

In such a conventional example, it is necessary to register or cancel the call waiting service for each subscriber using an input/output terminal connected to the central processing unit. That is, it is necessary to notify the telephone office in advance of registration or cancellation of call waiting. This conventional example has the disadvantage that the call waiting service cannot be registered or canceled while the call is in progress. In addition, since the registration and cancellation information is stored in the subscriber memory in the main memory of the electronic exchange, if the subscriber memory is destroyed for some reason, the registration and cancellation of the call waiting service can be performed again for each subscriber. There are also drawbacks that must be done.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and to provide a call waiting system that allows a subscriber to register and cancel a call waiting service even while the subscriber is on a call.

[Means to solve the problem]

The present invention is directed to a system that includes subscriber terminals connected to an ISDN network, and an electronic exchange that includes service execution means for executing a call waiting service and that accommodates the subscriber terminals. In the waiting method, the subscriber terminal is equipped with a registration means for registering the call waiting service of the subscriber terminal, and the electronic exchange responds to a call setting message from the subscriber terminal to determine the destination of the call specified by this message. The subscriber terminal includes message sending means for sending an additional call setting message to the subscriber terminal, and the subscriber terminal registers the call waiting service registration state of the registration means of the own terminal in the electronic exchange in response to the additional call setting message. The above-mentioned electronic exchange is characterized by comprising a notification means for notifying the user, and a control means for enabling the service execution means in response to the notification from the notification means.

[Effect]

The ISDN terminal has a call waiting registration means,
An additional call control message (D channel Layer 3 INFORM) from the electronic exchange indicates the presence or absence of registration.
ATION message). The electronic exchange that receives this notification can perform call waiting service.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing signal transmission in the call waiting system according to this embodiment. Subscribers A, B and C are housed in an electronic exchange capable of ISDN subscriber control. Subscriber A has registered for call waiting service.

In this embodiment, as shown in FIG.
The system includes a subscriber terminal 200 connected to a subscriber terminal 200, and an electronic exchange 100 having a service execution means 13 for executing a call waiting service and accommodating the subscriber terminal 200. As a means to
The subscriber terminal 200 is equipped with a registration means 21 for registering the call waiting service of the subscriber terminal, and the electronic exchange 10
0 is a message sending means 1 for sending an additional call setting message to the called destination subscriber terminal specified by this message in response to a call setting message from the subscriber terminal 200;
1, the subscriber terminal 200 includes a notification means 22 for notifying the electronic exchange 100 of the call waiting service registration state of the registration means 21 of the subscriber terminal in response to the additional call setting message, and the electronic exchange 100 includes: A control means 12 is provided to enable the service execution means 13 in response to the notification from the notification means 22.

Next, the operation of this embodiment will be explained. Subscriber A is currently talking to subscriber B. When subscriber C attempts to receive a call from subscriber A, since subscriber A is busy, an additional call control message (INFORMATION message) is sent to confirm whether there is a call waiting service for the subscriber.

〔Effect of the invention〕

As explained above, the present invention allows the ISDN subscriber terminal itself to memorize the registration and cancellation of the call waiting service, thereby allowing the subscriber to register and cancel the call waiting service even when the subscriber is in the middle of a call. Even if the main storage device of the computer is destroyed, there is no need to use the input/output terminal again and the call waiting service can be received.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a sequence diagram showing a signal transmission process according to an embodiment of the present invention. FIG. 3 is a block configuration diagram showing the configuration of a conventional example. 1.2.3...Subscriber memory, 10...Call path switch network, 11...Message exit means, 1
2... Control means, 13... Service execution means, 20
...Central processing unit, 21...Registration means, 22...
Notification means, 30... Main storage device, 40... Input/output terminal, 100... Electronic exchange, 200... Subscriber terminal, 300... ISDN network. Figure 1 Structure of conventional example Figure 3

Claims (1)

[Claims] 1. A call included in a system that includes a subscriber terminal connected to an ISDN network and an electronic exchange that has a service execution means for executing a call waiting service and accommodates the subscriber terminal. In the waiting method, the subscriber terminal is equipped with a registration means for registering the call waiting service of the subscriber terminal, and the electronic exchange responds to a call setting message from the subscriber terminal to determine the destination of the call specified by this message. The subscriber terminal includes message sending means for sending an additional call setting message to the subscriber terminal, and the subscriber terminal transmits the call waiting service registration status of the registration means of the own terminal to the electronic exchange in response to the additional call setting message. A call waiting system, characterized in that the electronic exchange comprises a notification means for notifying the user, and the electronic exchange comprises a control means for enabling the service execution means in response to a notification from the notification means.