JPH03123166A - Incoming transfer system - Google Patents

Abstract

PURPOSE:To know whether an incoming transfer telephone number is registered or not without imposing a burden to an electronic exchange by constituting the system so that an ISDN subscriber terminal itself stores the incoming transfer telephone number. CONSTITUTION:When a subscriber terminal is set to an incoming transfer telephone number registration mode, and a numerical key on a key pad 25 is depressed, a telephone number of a transfer destination can be registered as an incoming transfer telephone number onto a RAM 24. On the other hand, when other prescribed key on the key pad 25 is depressed, the registered incoming transfer telephone number is read out of the RAM 24, and displayed on a display part 28. Subsequently, when a call setting message is sent from an electronic exchange, the incoming transfer telephone number is informed, and the electronic exchange determines an incoming transfer destination, based thereon. In such a way, a subscriber can check easily a transfer destination of a telephone, and in the case the transfer destination is not designated, it can be registered.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a call transfer system that transfers calls.
In particular, it relates to a call forwarding system serving ISDN terminals.

[Conventional technology]

Call diversion systems, which forward the call to another number before the called party answers, are useful when the called party is away from home.

Conventionally, in such systems, the electronic exchange receives a telephone number to which a call is to be transferred dialed from a subscriber terminal connected to the electronic exchange and stores it in its main memory.

When a call arrives at that subscriber terminal, the electronic exchange determines whether or not to forward the call based on the subscriber status, and uses the forwarding destination telephone number stored in the main memory to forward the call. I was making a transfer.

FIG. 3 shows the main parts of a conventional exchange system. Both subscriber A and the BSC are connected to a call path switch network 11 of an electronic exchange. This communication path switch network 11 is controlled by a central processing unit 13 to which a main storage device 12 is connected. A plurality of subscriber memories 14 are arranged within the main storage device 12 .

Now, assume that subscriber A is registering a telephone number to which calls will be forwarded. In this case, subscriber A dials the access code for call transfer registration and the telephone number of the call transfer destination. The electronic exchange stores the telephone number of the incoming call transfer destination in the subscriber memory 14-1 prepared for subscriber A in the main storage device 12. In this example, the call transfer destination is subscriber C.

After this, it is assumed that subscriber B calls subscriber A. The central processing unit 13 stores subscriber memo U1 for subscriber A.
The telephone number of the forwarding destination was read from 4-1, and the call was forwarded to subscriber C based on this.

[Problem to be solved by the invention]

In conventional call transfer systems, when the subscriber who is transferring the call registers the phone number of the destination to which the call is transferred, the electronic exchange registers the subscriber's subscription when the registration is done. The system notifies users of the fact that registration has been completed through tones and announcements. When a call is received after call forwarding has been registered, a call forwarding tone is sent to the subscriber terminal that is the source of the call transfer, so that the subscriber that is the source of the call transfer determines that the call has been transferred. Ta.

In this conventional call transfer system, it may be necessary to determine whether the subscriber who is the source of the call transfer has registered for call transfer. In such a case, if a call diversion tone sounds just as a call is about to arrive, the subscriber who is the call diversion source can confirm that the call diversion has been registered. However, in other cases, there is a problem in that it is not possible to determine whether the subscriber who is the call transfer source has registered for call transfer.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a call transfer system that can confirm whether a subscriber who is a call transfer source has registered for call transfer.

[Means to solve the problem]

In the present invention, (i) a registration means for registering a call forwarding telephone number, a display means for displaying the registered call forwarding telephone number, and a display means for notifying the call forwarding telephone number when a call setting message is sent from an electronic exchange; I equipped with notification means to
SDN (Integrated Service Digital Network) terminal and (ii)
A call transfer system is constituted by an electronic exchange that determines a call transfer destination based on the call transfer telephone number notified from the ISDN terminal.

Then, register the call forwarding phone number on the ISDN terminal side,
This can be displayed on a display means so that registration can be confirmed.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 shows the main part of the circuit configuration of a subscriber terminal used by each subscriber in the call transfer system of this embodiment. This subscriber terminal is equipped with a CPU (central processing unit) 21, and a ROM 23 and a RAM 2 through a bus 22.
4, a keypad 25, a telephone circuit 26, a display driver 27, and other circuits. Here ROM23
is a read-only memory that stores programs for performing various controls on this subscriber terminal. RAM24
is a working memory, and a call forwarding telephone number is stored in a part of this area. The RAM 24 may be backed up by a battery and constitute a non-volatile memory if necessary.

The keypad 25 is used not only for normal dialing operations but also for registering a call forwarding telephone number. The telephone circuit 26 accommodates a telephone call circuit and a signal circuit related to the calling/receiving function. A display 28 is connected to the display driver 27, and is configured to display necessary information such as a registered call forwarding telephone number by operating the keypad 25.

Subscribers A to C can set their subscriber terminals to the call transfer telephone number registration mode by operating predetermined keys on the keypads 25 of their own subscriber terminals. In this state, by pressing a numeric key on the keypad 25, the forwarding destination telephone number can be registered on the RAM 24 as the incoming call forwarding telephone number. Also, if you press another predetermined key on the keypad 25, the registered call forwarding phone number will be transferred to the RA.
It is read out from M24 and displayed on the display 28. Therefore, subscribers A to C can easily check the forwarding destination of their calls, and if the forwarding destination is not specified, they can register it. Further, if the call forwarding telephone number is not appropriate, the registered contents can be corrected by performing the above-mentioned registration operation again.

FIG. 2 is for explaining how signals are exchanged when transfer is performed in a call transfer system having such subscriber terminals. In this explanation, it is assumed that subscriber A has registered subscriber C's call forwarding telephone number in his own subscriber terminal.

When subscriber B makes a call to subscriber A as the called party, subscriber B first sends a call setup message (S
ETUP) is sent (step ■). In response, the electronic exchange sends a call setup acceptance message (CALL).
PROC) is returned (step 2).Next, the electronic exchange sends a call setup message (SBTIIP) to subscriber A as the called party (step 2). In response, subscriber A receives a call setup acceptance message (CALL).
PROC) is returned (step 2), but at this time, the call transfer telephone number stored in the RAM 24 is read out, and the telephone number of subscriber C is returned together.

After this, the telephone exchange sends a disconnection message (Disc) to the subscriber (step ■), and subscriber A sends a release message (RBL) (step ■).
. In response, the electronic exchange sends a release completion message (RB
After completing the process for subscriber A in this way, the electronic exchange then sends back the call to subscriber C based on the call forwarding telephone number obtained in step ■. Call setup message (SBTtl
P) is sent (step ■). On the other hand, subscriber C
sends back a call setup acceptance message (CALL PROC) (step 2), and then sends a call message (ALERT) to the electronic exchange (step 0).

In this state, a call to subscriber C is started. When the electronic exchange receives the paging message, it sends it to subscriber B (step 2), and subscriber C is placed in a paging state.

Thereafter, when subscriber C picks up the handset and responds, a response message (CONN) is sent to the electronic exchange (step 2). In response, the electronic exchange returns a response confirmation message (CONACK) to subscriber C (step 0), and also sends a response message (CONACK) to subscriber B (step 0).
ONN) (step 0) to connect the line. Subscriber B sends a response confirmation message (CONN ACK)
is sent back to the electronic exchange (step ■), and all signal processing for the connection is completed.

In the embodiment, the call forwarding telephone number was visually displayed on the display of the subscriber terminal, but it may be printed out on a printer, or it may be displayed audibly using an audio ROM. .

〔Effect of the invention〕

As explained above, according to the first aspect of the present invention, the ISDN subscriber terminal itself stores the call forwarding telephone number, so there is no need to place a burden on the electronic exchange to determine whether or not the call forwarding telephone number is registered. It can be known, and it can be known immediately or constantly.

[Brief explanation of drawings]

1 and 2 are for explaining one embodiment of the present invention. Of these, FIG. 1 is a block diagram showing the main part of the circuit configuration of the subscriber terminal, and FIG. FIG. 3 is an explanatory diagram of signal transmission showing how incoming calls are transferred when a call is made. FIG. 3 is an explanatory diagram showing the main parts of a conventional switching system. 11...Call path switch network, 21.
...CPU123'...20M124.
...RAM, 25 ...Keypad, 28
...Display unit, A-C...Subscriber.

Claims (1)

[Scope of Claims] Registration means for registering a call transfer telephone number, display means for displaying the registered call transfer telephone number, and notification of the call transfer telephone number when a call setting message is sent from an electronic exchange. A call forwarding system comprising: an ISDN terminal having a notification means for transmitting a call; and an electronic exchange that determines a call forwarding destination based on the forwarding telephone number when the ISDN terminal notifies the forwarding telephone number. .