JPS6336706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for confirming transfer when transferring a call back, and the present invention relates to a transfer confirmation method when transferring a call back, and the present invention is a call back transfer in which a transfer completion notification sound is sent to the subscriber telephone that has performed the transfer to notify the transfer completion. Concerning confirmation method.

Conventionally, when performing callback transfer on an incoming call from a central office line or the like in an automatic exchange, a callback transfer method has been known in which the call is transferred when the subscriber's telephone that performs the transfer goes on-hook. ing. The call connection circuit diagram of the call back transfer method shown in Fig. 1 shows an example.To explain the operation mode using the diagram, in response to an incoming call from a central office line, etc., In response to the request to transfer the incoming call to another extension telephone B, the extension telephone A which is answering a call through the internal connection path is put on hold by hooking the extension telephone A or the like. When extension telephone A dials the number of another extension telephone B, extension telephone B is called by the local trunk IOT and the ringing signal trunk RGT through the connection path of the network NW, and the extension telephone B is called.
In response to this response, extension telephone A can make a meeting call with extension telephone B through the connection path of network NW. Next, after the call between each extension telephone A and B is completed, extension telephone A goes on-hook, and a communication circuit is formed between the office line and extension telephone B through the connection path of the office line trunk COT and the network NW. Here, SC in FIG. 1 is a network drive device controlled by the central processing unit CC.

However, in the conventional callback transfer method as described above, extension telephone A that transferred the call is placed on the central office line etc. with extension telephone B due to on-hook, and there is no way to check whether or not the call was transferred reliably. The drawback was that it could not be confirmed.

An object of the present invention is to perform callback transfer for an incoming call from a central office line, etc., as in the conventional example described above, without using any expensive additional equipment.
When the central office line etc. is connected to extension telephone B due to on-hook of extension telephone A, a notification tone indicating the completion of transfer is sent to extension telephone A to confirm the transfer, thereby improving the service in call back transfer. The purpose of the present invention is to provide a method for confirming transfer when transferring a callback in a manner that is timely.

The present invention was invented in order to eliminate the above-mentioned drawbacks, and is based on a method in which when a call back transfer is executed for an incoming call from a central office line, etc., the call is transferred by on-hook of the subscriber's telephone that performed the transfer.
When executing the above callback transfer, the transfer requesting subscriber telephone that performed the transfer and went on-hook is
The system is characterized in that the connecting circuit CO, which connects the DC power supply B supplied from the exchange side, is operated intermittently to drive the bell circuit BL of the subscriber's telephone, and the ringing of the bell circuit notifies the completion of the transfer.

Hereinafter, the present invention will be explained in detail by examples based on the drawings.

FIG. 2 shows a circuit for transmitting a callback transfer completion confirmation notification sound for an electronic automatic switchboard according to an embodiment of the present invention. Note that the call connection circuit diagram for performing call back transfer is performed using the same circuit configuration as that in FIG. 1, so the operation mode will be explained with reference to FIG. 1.

Now, in Fig. 1, when extension telephone A is called by an incoming call on the central office line, etc., extension telephone A goes off-hook and establishes a call state with the central office line through the central office trunk COT and the connection path in the network NW. At this time, as shown in FIG. 2, the cut-off contact CO of extension telephone A is opened as indicated by the dotted line. In response to the request to transfer the incoming call to another extension telephone B, extension telephone A performs the same operation as explained in FIG. As shown in the figure, a conversation is established with the transfer destination extension telephone B, and when the completion of this transfer is confirmed, the cut-off contact of extension telephone A shown in FIG.
The closing (solid line position) and opening (dotted line position) operations of the CO are performed by the network drive unit SC under the control of the central processing unit CC. At this time, by closing the cut-off contact CO, the line relay LR is transferred from the DC power supply B to the cut-off contact C.
O, capacitor C of extension telephone A, bell circuit BL
Since DC voltage is supplied to the circuit consisting of , it is possible to confirm that the callback transfer has been performed by the notification sound indicating the completion of the transfer. The notification sound announcing the completion of the call back transfer in the above-mentioned bell circuit BL is, for example, a sound with a period of about 0.5 seconds, depending on the time constant in the telephone circuit, so that it can be clearly distinguished from the ringing signal of a normal extension telephone. Preferably, this is done by means of an intermittent tone.

In addition, in Fig. 2, R is the receiver, T is the transmitter, and Hs
indicates a switch.

As described in detail above, according to the present invention, when a callback transfer is performed for an incoming call from a central office line, etc. in an automatic exchange, a transfer is performed to notify the subscriber telephone that performed the transfer of the completion of the transfer. By sending out a completion notification sound, the subscriber telephone that performed the transfer is confirmed to have completed the transfer. In particular, when performing the above-mentioned callback transfer confirmation operation, there is no need to This can be realized without using any expensive additional equipment. Therefore, in the conventional callback transfer method of this type, it is possible to completely eliminate the drawback that it was not possible to confirm whether or not the callback transfer has been performed reliably, and it also has advantages such as being able to further improve the service in callback transfer. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a call connection circuit diagram of a conventional call back transfer system, and FIG. 2 is a call back transfer completion confirmation notification tone sending circuit of an electronic automatic switchboard according to an embodiment of the present invention. A, B...extension telephone, NW...network, COT...office line trunk, IOT...intra-office trunk, RGT...calling signal trunk, SC...network drive unit, CC...central processing unit, C.O.
...Cut-off contact, LR...Line relay, B
...DC power supply, C...capacitor, BL...bell circuit.

Claims (1)

[Scope of Claims] 1. In a method in which, when executing a call back transfer for an incoming call from a central office line, etc., the call is transferred by the on-hook of the subscriber's telephone that performed the transfer; The connection circuit CO that connects the DC power supply B supplied from the exchange to the subscriber telephone that requested the transfer is operated intermittently, the bell circuit BL of the subscriber telephone is driven, and the transfer is performed by the ringing of the bell circuit. A transfer confirmation method when transferring a call back, which is characterized by notifying completion.