JPH035704B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone connection system in a telephone switching network in which each subscriber goes off-hook and dials the other party as the connection request destination.

Traditionally, in telephone connection systems that connect subscribers via telephone exchanges or telephone exchange networks,
from the first subscriber of the originating subscriber to the second subscriber of the terminating subscriber.
When a connection request is made to a subscriber and the dial is made after off-hook (with recent telephone services, this may be possible by pressing a button without lifting the receiver and off-hook, or
For dialing operations, button-type or voice-based connection methods have also appeared, and the meanings of off-hook and dialing operations used here are not limited to the above-mentioned types that have been used for a long time). If subscriber 2 is off-hook, this is treated as the other subscriber being busy (talking).
A connection method has been adopted in which this fact is notified to the first subscriber, which is the originating subscriber, using a busy tone and the call is abandoned. In addition, there is a camp-on service as a new telephone service that notifies the second subscriber that there is a call request, and by using this service, it becomes possible to make an interrupt call during a call. However, when the second subscriber is dialing towards the first subscriber, each of the first and second subscribers will do the dialing while the other subscriber is dialing. If the subscriber is not on-hook, the busy tone will be returned forever and no connection can be established between the first and second subscribers.

The situation described above is often seen when, for example, in the in-house telephone networks recently adopted by major companies, when a call is forced to be disconnected when the call time limit is exceeded, the user wants to continue making calls. It is something that can be done. That is, normally, there is no problem if the subscriber who requested the call first makes the call again and the other subscriber is on-hook and waiting, or vice versa, but sometimes... If the promise does not go as planned or there is a small amount of free time, the subscriber who is in the waiting role becomes anxious and makes a call, resulting in the situation described above. The drawback was that connections between subscribers were not established.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional system, and allows a first subscriber and a second subscriber to connect to each other through a telephone exchange or a telephone exchange network. If a request is made,
a telephone exchange accommodating the first subscriber or the second subscriber verifies the calling subscriber number;
When the connection request destination is between the first subscriber and the second subscriber, the mutual connection can be made without the other subscriber being busy and with each receiver on-hook. It is an object of the present invention to provide a telephone connection system which has a configuration in which the telephone service can be further improved.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a telephone connection system according to an embodiment of the present invention. In the figure,
A and B are subscribers, C is a telephone exchange, 1 is an exchange control device, 2 is a subscriber memory, and 3 is a communication path switch. What is shown in Figure 1 is subscriber A and subscriber B.
The figure shows a so-called intra-office connection in which both parties are housed in the same telephone exchange C, and each subscriber A and B is calling the other subscriber by off-hooking each receiver (not shown). It represents.

Next, the operation shown in FIG. 1 will be explained. Since subscriber A and subscriber B are both telephones housed in telephone exchange C, exchange control device 1 connects subscriber A and subscriber B together, that is, it is an intra-office connection, and each subscriber A , B are both off-hook by referring to the subscriber memory 2. In the above-mentioned conventional telephone connection system, only a one-way search for a subscriber in which the status of the other subscriber is off-hook is terminated as the other subscriber is busy, but in the telephone connection system of the present invention, A two-way subscriber search is performed in which the dial destination of the other subscriber is compared with the subscriber number of the caller. A call path is formed with subscriber B, and calls can be made between each subscriber A and B. In this case, in order to eliminate the unnatural situation where both subscribers A and B receive a call from the other subscriber immediately without hearing the ring back tone, telephone exchange C It is effective to implement a method of sending a ring back tone to both A and B. The additional functions to this invention as described above can be easily inferred from this invention, and do not limit the scope of the claims that are the gist of this invention.

FIG. 2 is a block diagram showing a telephone connection system according to another embodiment of the present invention. The same parts as in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted. In the figure, D is a telephone exchange;
N is a telephone switching network, and 4 is a relay path connecting subscriber A's communication path switch 3 and subscriber B's communication path switch 3. What is shown in FIG. 2 shows a so-called inter-office connection in which subscriber A is accommodated in telephone exchange C and subscriber B is accommodated in telephone exchange D. Now, telephone exchange C, which has detected a call from subscriber A, which is the originating subscriber, sets up a call path from the subsequent dial signal to telephone exchange D.
is in an off-hook state. In the conventional telephone connection system described above, at this time, a busy tone indicating that the other subscriber is busy is sent to subscriber A, the originating subscriber, through the previously set call path to prompt disconnection. In the telephone connection system of the invention, at the same time as forming a call path from subscriber A, which is the originating subscriber, to telephone exchange D, the subscriber number of subscriber A, which is the originating subscriber, is stored in the subscriber memory 2 of telephone connection equipment D. send. The subscriber memory 2 of the telephone exchange D has information on both the calling subscriber number and the called subscriber number.
The conditions are the same as for the connection within the local station shown in the figure. That is, the exchange control device 1 determines that the dial destination of subscriber B is subscriber A, and that the dial destination of subscriber A is subscriber B, and thereby,
By closing the communication path switch 3, communication between subscriber A and subscriber B becomes possible.

In the above explanation, the flow of forming a call path from subscriber A was described, but unless there is a parent-child relationship between each telephone exchange C and D, a call path is similarly formed from subscriber B, and each subscriber This means that there are two bidirectional communication paths between parties A and B. Therefore, there is no problem if the communication path in one direction is naturally removed due to the communication path switch 3 being busy or the relay path 4 being busy.
In addition to this, in order to limit the call path to only one, for example, the calling subscriber number can be transferred from the telephone exchange accommodating the subscriber with the lower subscriber number to the telephone exchange of the other party. , the above problems are solved.

Furthermore, as is clear from the above explanation, in the telephone connection system of the present invention, if the call between each subscriber A and B is not an intra-office connection, it is essential to transfer the calling subscriber number. However, since such a function has recently been realized in the form of a subscriber number transfer service, it is clear that this technology does not prevent the realization of the present invention. However, this type of telephone service can be easily realized in a telephone switching system using a common line signaling system.

As described above, according to the telephone connection system of the present invention, the telephone exchange accommodating the first subscriber or the second subscriber verifies the calling and receiving subscriber numbers;
When the connection request destination is between the first and second subscribers, the other subscriber is not busy;
In addition, since the configuration is such that mutual connection can be made while each handset is off-hook, it is particularly easy for both parties involved to make a re-call after being disconnected due to the call limit exceeding the conventional in-house telephone network. This has the excellent effect of greatly improving telephone service, since it can easily solve the current situation of dialing each other and not being able to connect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a telephone connection system according to one embodiment of the present invention, and FIG. 2 is a block diagram showing a telephone connection system according to another embodiment of the invention. In the figure, A, B...Subscriber, C, D...Telephone exchange, N...Telephone exchange network, 1...Switch control device, 2...Subscriber memory, 3...Call path switch, 4... It is a relay line. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. When a first subscriber and a second subscriber make a connection request to the other party via a telephone exchange or a telephone exchange network, the system accommodates the first subscriber or the second subscriber. The telephone exchange connected to the terminal verifies the calling and receiving subscriber numbers, and when the connection request destination is between the first subscriber and the second subscriber,
This telephone connection system is characterized in that it is possible to connect to each other without making the other party busy and with each handset in an off-hook state.