JPH0828773B2 - Automatic exchange system with call waiting function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is provided with a plurality of channels on one subscriber line, and a plurality of terminal devices are connected in parallel to this subscriber line. In an automatic exchange system in which each terminal device can simultaneously communicate with the terminal devices of other subscriber lines via the automatic exchange by using each of them, one of the plurality of terminal devices connected in parallel to the subscriber line uses one channel. The present invention relates to a call waiting method by an automatic exchange when a call is received from a terminal device of another subscriber line while communicating with the terminal device of another subscriber line via the automatic exchange.

With the advancement of automatic exchanges, there are subscribers who connect a plurality of terminal devices in parallel to one subscriber line and can simultaneously communicate with the plurality of terminal devices via a plurality of channels provided on the subscriber line. It is in the moment to be housed in an automatic exchange.

For such a subscriber, the call waiting service provided by the conventional automatic switching network, that is, the subscriber who is communicating is notified that a new call has arrived, and the subscriber performs a predetermined operation. It is desired to hold the other party who is in communication and provide a service for a new incoming call.

[Conventional technology]

FIG. 3 is a diagram showing an example of a call waiting method in a conventional automatic exchange.

In FIG. 3, it is assumed that the subscriber 4 makes a call to the subscriber 2 while the subscribers 2 and 3 accommodated in the automatic exchange 1 are talking. The central control unit (CC) 5 of the automatic exchange 1 which has detected the call, refers to the area M ₂ corresponding to the called subscriber 2 provided in the main memory (MM) 6, and the availability information IB When it detects that it is set to the closed state (for example, logical value 1) and confirms that the call waiting function CW is added, the calling subscriber 2 is called via the network (NW) 7. Call waiting sound generation circuit (CT) 8 is connected to call waiting sound generation circuit 8
To hear the call waiting sound sent by.

When the subscriber 2 who listens to the call waiting sound knows that a new call has arrived during a call and performs a predetermined operation for responding to the new call, for example, hooking, the central control unit detects the hooking. Reference numeral 5 connects the subscribers 2 and 4 via the network 7 and also connects the subscriber 3 to the hold sound generation circuit (WT) 9 so that the hold sound generated by the hold sound generation circuit 9 is sent to the subscriber 3. Make them listen.

When the subscriber 2 hooks again in such a state,
The central control unit 5 which has detected the hooking connects the subscribers 2 and 3 via the network 7 and also the subscriber 4
Is connected to the hold sound generation circuit 9 so that the subscriber 4 hears the hold sound sent by the hold sound generation circuit 9.

In the same manner, the subscriber 2 can talk with any one of the subscribers 3 and 4 each time hooking is performed.

[Problems to be solved by the invention]

As is clear from the above description, in the conventional call waiting method, the automatic exchange 1 accommodating the subscriber 2 identifies the empty / occlusion information of the subscriber 2 and immediately executes the call waiting process when it is in the blocked state. Was.

However, as described above, one subscriber line is provided with a plurality of channels, and a plurality of terminal devices are connected in parallel to this subscriber line, and each terminal device simultaneously uses the plurality of channels to simultaneously pass through the automatic exchange. In a system capable of communicating with terminals of other subscriber lines, it is optional for a subscriber of one subscriber line having a plurality of channels to connect a plurality of terminals to the subscriber line in parallel. Because
It is difficult for the automatic exchange side to grasp the availability information of each terminal device connected in parallel.

In addition, it is impossible to determine whether the terminal device in the idle state responds to the incoming call to the subscriber line or whether the terminal device in communication supports the call waiting function. I couldn't uniquely decide.

[Means for solving problems]

According to the present invention, the above problem is provided with a plurality of channels.
An automatic exchange system having a call waiting function in which a plurality of terminal devices are connected in parallel to a subscriber line, and each terminal device can connect to a terminal device of another subscriber line through an automatic exchange using any channel. At this time, one terminal device in the terminal devices connected in parallel to one subscriber line with the call waiting function is using one channel and is communicating with the terminal device of the first subscriber line via the automatic exchange. , When there is an incoming call from the terminal device of the second subscriber line to the subscriber line to which this terminal device is connected, the automatic exchange shall notify all of the subscriber lines to which the terminal device in communication is connected. When an incoming call signal containing call waiting permission information is sent to any of the terminal equipments, and one of the terminal equipments including the communicating terminal equipment wishes to respond, the automatic exchange will select the terminal currently using the channel. Call to the terminal device of the second subscriber line through the channel in use for the device and through the other channel for the other terminal device. It is solved by an automatic exchange system with a weighting function.

[Action]

That is, according to the present invention, the incoming call signal transmitted from the automatic exchange enables the terminal device in communication to display the incoming call, and when the signal requesting call waiting is received from the terminal device in communication, the communication is in progress. Since the call waiting process is executed for the terminal device, the call waiting service can be used depending on the intention of the subscriber.

〔Example〕

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

FIG. 1 is a diagram showing an automatic exchange system having a call waiting function according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a signal transmission process in FIG.

 The same reference numerals indicate the same objects throughout the drawings.

In FIG. 1, a subscriber 20 of one subscriber line has three terminals 21 to 23, which are connected in parallel, and two channels 101 and 102 are provided in this subscriber line. Therefore, each of the terminal devices 21 to 23 can simultaneously communicate with another terminal device of another subscriber line through the automatic exchange using the channel 101 or 102. In this example, all the terminal devices 21 to 23 are telephone terminal devices.

In FIGS. 1 and 2, it is assumed that the terminal device 21 is communicating with the subscriber 3 via the automatic exchange 1 and the channel 101. In this state, it is assumed that the subscriber 4 sends the calling signal a to the subscriber 20 to the automatic exchange 1. The calling signal a
The central control unit 5 of the automatic exchange 1 that has detected the call refers to the area Ma corresponding to the called subscriber 20 provided in the main memory 6 and that the subscriber 20 is provided with the call waiting function CW. When it confirms that the call confirmation signal c (c) including the call waiting permission information ca is sent to the subscriber 20, the call confirmation signal c is returned to the subscriber 4.

This incoming signal b (ac) is used by the terminal device 22 in the idle state.
And 23 are also transmitted to the terminal device 21 currently communicating via the channel 101. The terminal devices 21 to 23 display the incoming call and send back the incoming call confirmation signal d to the automatic exchange 1, respectively. Receiving the incoming call confirmation signal d, the central control unit 5 of the automatic exchange 1 returns the ringing signal e to the subscriber 4. When a terminal device in an idle state, for example, the terminal device 22 desires a response, when a predetermined operation, for example, off-hook is performed, the terminal device 22 can communicate with the subscriber 4 via the channel 102 and the automatic exchange 1. Become. When the terminal device 21 communicating with the subscriber 3 desires to answer a new incoming call, a predetermined operation, for example, operation of a call waiting button provided on the terminal device 21, causes the terminal device 21 to communicate now. The call waiting request signal f (101) indicating the inner channel 101 is returned to the automatic exchange 1. Upon receiving the call waiting request signal (101), the central control unit 5 of the automatic exchange 1 sends an incoming call restoration signal g to the terminal devices 21 to 23. Receiving the incoming call restoration signal g, each of the terminal devices 21 to 23 restores the incoming call display and returns a restoration confirmation signal h to the automatic exchange 1. Upon receiving the restoration confirmation signal h, the central control unit 5 of the automatic exchange 1 connects the call waiting sound generating circuit 8 to the designated channel 101 via the network 7, and outputs the call waiting sound generated by the call waiting sound generating circuit 8. i is transmitted to the communicating terminal device 21 via the channel 101. The terminal device 21 that heard the call waiting sound i
However, when a predetermined operation is performed to answer a new incoming call, for example, the call waiting button is operated, the terminal device
21 returns the hooking signal j to the automatic exchange 1. Central control unit 5 of automatic exchange 1 which received hooking signal j
Returns a response signal k to the subscriber 4, executes the call waiting process similar to that in FIG. 3, connects the subscriber 4 to the channel 101 through the network 7, and
The subscriber 3 is connected to the hold sound generation circuit 9 so that the subscriber 3 hears the hold sound m sent by the hold sound generation circuit 9.

Thereafter, as in the case of FIG. 1, each time the terminal device 21 operates the call waiting button, it becomes possible to communicate with any one of the subscribers 3 and 4.

As is clear from the above description, according to the present embodiment, even when a new call arrives from the subscriber 4 while the terminal device 21 is communicating with the subscriber 3, the call waiting using the terminal device 21 is possible. Becomes

It is to be noted that FIGS. 1 and 2 are merely one embodiment of the present invention, and the types and the number of terminal devices and the number of channels of the subscriber 20 are not limited to those shown in the figures, and other Many variations are considered, but in any case, the effect of the present invention does not change.

〔The invention's effect〕

As described above, according to the present invention, a call waiting process can be performed even for a subscriber who accommodates a plurality of terminal devices on the same subscriber line and has a plurality of channels on the subscriber line, and the serviceability of the automatic exchange is improved. Is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an automatic exchange system having a call waiting function according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a signal transmission process in FIG. 1, and FIG. 3 is a call in a conventional automatic exchange. It is a figure which shows an example of a weighting method. In the figure, 1 is an automatic exchange, 2, 3, 4 and 20 are subscribers, 5 is a central controller (CC), 6 is a main memory (MM),
7 is a network (NW), 8 is a call waiting sound generation circuit (CT), 9 is a hold sound generation circuit (WT), 21 to 23
Is a terminal device, 101 and 102 are channels, a is a calling signal,
b (ca) is an incoming call signal, c is an outgoing call confirmation signal, d is an incoming call confirmation signal, e is a ringing signal, f (101) is a call waiting request signal, i is a call waiting sound, j is a hooking signal, k is a response signal, m is a holding tone, M ₂ and Ma are areas, CW call waiting function, and IB, IB1 and IB2 are air block information.

Claims (1)

[Claims] 1. A plurality of terminal devices are connected in parallel to one subscriber line having a plurality of channels, and each terminal device uses one of the channels to connect with a terminal device of another subscriber line through an automatic exchange. In an automatic exchange system having a call waiting function which is possible, one terminal device among the terminal devices connected in parallel to one subscriber line to which the call waiting function is added uses one channel, When a call is received from the terminal device of the second subscriber line to the subscriber line to which this terminal device is connected while communicating with the terminal device of the subscriber line of When an incoming call signal including call waiting permission information is sent to all the terminal devices of the connected subscriber lines of, and one of the terminal devices including the communicating terminal device wants to respond, The exchange is connected to the terminal device of the second subscriber line via the channel in use for the terminal device currently using the channel and via the other channel for the other terminal device. An automatic exchange system having a call waiting function characterized by forming a connection path.