JPS6051052A - Recalling system by additional dial - Google Patents

Abstract

PURPOSE:To inform a called extension of request for recalling and enable a called subscriber to make recalling properly by letting a caller additional dial specified items in case of incoming of trunk line. CONSTITUTION:When a station side caller desires call to an extension 3 by additional dial system, the caller dials additionally special number for request for recalling, number of the extension, subscriber's number of the caller and hooks on. Consequently, a central controlling unit 9 stores this dial information in a memory 10, and displays presence of recalling request on a display unit 4 provided in the extension 3. Then, when the extension 3 dials special number for calling and recalling, the unit 9 catches a main wire trunk 5 and a sender 7, and reads out subscriber's number of the caller from the memory 10 and sends out. Consequently, the caller is recalled automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call-back system using an additional dial that can respond to a call-back request from a central office subscriber in a private branch exchange that uses an additional dial system to call a local extension line in response to an incoming call to a central office. It is.

The purpose of the present invention is to notify the called extension that a callback request has been made by having the calling party dial additional predetermined information when receiving a call from the central office line. To provide a call-back system using additional dialing, which allows a called party to call back a central office line caller as appropriate.

In order to achieve the object of the present invention, the configuration of the call-back method using additional dialing according to the present invention is such that a private branch exchange device that calls an extension line using the additional dialing method in response to an incoming call to the central office line, In this case, the called party's extension number and the calling party's subscriber number are additionally dialed by the caller on the central office side's special number, call extension number, and subscriber number of the calling party. The station subscriber number is stored in a storage device, and the call-back request is displayed on the telephone of the called extension (by the means for displaying the call-back request), after which the called extension makes a call. By making a call and dialing a predetermined special number, the subscriber number is read out from the storage device and the caller is automatically called back.

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

FIG. 1 is a relay system diagram showing an embodiment of the call-back system using additional dials according to the present invention.

In the figure, 1 is a switch network, 2 is a line circuit of an extension telephone 3, 4 is a callback request indicator connected to the line circuit 2, 5 is a central office line trunk, 6 is a central office line, 7 is a sender,
8 is a register, 9 is a central control unit, and 10 is a recall storage device connected to the central control unit 9.

Now, when a call arrives from the office line 6 to the office line trunk 5, the office line 6 is connected to the register 8 through the switch network 1. Here, if the caller of the station wishes to make a call to the extension telephone 3 using the additional dialing method, and for example wishes the extension telephone 3 to pay the call fee, the caller will , special code for callback requests.

The extension number of the extension telephone 3 and the caller's own subscriber number are additionally dialed to go on-hook. As a result, the central control device 9 stores the extension number of the extension telephone 3 and the subscriber number of the caller on the central office side in the storage device 10 for callback, and also displays a callback request display provided on the extension telephone 3. A message indicating that there is a call-back request is displayed on device 4. The call-back request display 4 may be constructed using a neon tube that turns on and off to indicate the presence or absence of a message in a hotel switching device, for example.

When the called party learns from the display 4 that there is a call-back request, the extension telephone 3 makes a call and dials the special number for the call-back, and the central control unit 9 stores the call-back request. It is determined whether the extension number of the extension telephone 3 is registered in the device 10, and if it is registered, the central office line trunk 5 and sender 7 are captured, and the central office side caller is stored from the storage device 10 for callback. The calling party's subscriber number is read out and sent from the sender 7 to the central office line 6 via the switch network l and the central office trunk 5.

When the sending of the central office line subscriber number is completed, the extension telephone 3 is connected to the calling party on the central office side via the switch network 1 and the central office trunk 5. As a result, the calling party at the station is automatically called back.

In the above embodiment, after being notified of the call-back request by the call-back request display 4 provided on the extension telephone 3, it is necessary to make a call and dial the special number for the call-back. However, it goes without saying that the system can be configured to automatically call back the caller just by making a call.

As explained above, according to the call-back system using the additional dialing system according to the present invention, when the caller on the central office line wishes to call back, he or she can additionally dial the predetermined information. It has the advantage that the called party can be notified of this fact, and that when the called party makes a call, the call can be automatically returned.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram of an embodiment of the call-back system using additional dials according to the present invention. 1...Switch network 2...Line circuit 3
...Extension telephone 4...Call-back request display 5...
・Station line trunk 6...Station line 7...Sender 8...Register 9...Central control unit IO...Storage device for call back Applicant: NEC Corporation

Claims (1)

[Claims] In a private branch exchange that calls an extension using the additional dialing method for an incoming call to the central office, when a call is received from the central office, the caller on the central office receives the special code, called extension number, and the calling party. by additionally dialing the station subscriber number of
The called party's extension number and the calling party's subscriber number are stored in a storage device, and the means for displaying the call-back request on the telephone set of the called extension indicates that there is a call-back request. Then, when the called extension makes a call and dials a predetermined special number, the station subscriber number is read from the storage device and the caller is automatically called back. Call-back method using additional dialing.