JPS62230250A - Call forward equipment for private branch of exchange - Google Patents

Abstract

PURPOSE:To attain an incoming call subjected to call forward without giving incoming to a caller when the final call forward destination is the caller himself by detecting the call forward state of a telephone set being a destination. CONSTITUTION:When an extension EKT1a makes a call to an extension EKT 1b subjected to call forward, an extension EKT 1n subjected to final call forward is cheked. If the final call forward destination EKT 1n calls the extension EKT 1a, a ring back tone is sent to the extension EKT 1a and a call tone is sent to the extension EKT 1x being the final call forward subjected to call forward. Thus, the caller can be subjected to the incoming to the extension subjected to call forward.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (INDUSTRIAL APPLICATION) The present invention is provided with a call service function of a private branch exchange (PBX). One of these is call forwarding. When an extension number holder moves to another location due to a meeting, etc., call forwarding information is given to the group of telephones using a specified operation, so that the telephone can receive calls. This function automatically forwards the call to the call forward destination. In this case, the call forward destination may be another extension or a curved line. The call forwarding destination extension may also have call forwarding information.
Since transfer is possible to this call forward, the call may be transferred.

(Problem to be solved by the invention) In this way, the caller can establish a telephone line with the owner of the desired extension number without dialing again. There was a problem that if the final call forwarding destination of the specified telephone was the caller, the caller would be called back and the call could not be made.For example, when going from the office to the conference room, the call forwarding of the former extension If the destination is set to be the latter extension, even if an emergency situation occurs, there will be no way to call the former extension from the latter extension, which may cause a major inconvenience.Also, if the former extension cancels call forwarding, In some cases, human error such as forgetting can result in long-term communication failures.

The present invention has been made in view of the above-mentioned problems, and its purpose is to forward the call to the caller by not allowing the caller to receive the call if the final call forward destination is the call forward destination or the caller himself/herself. The purpose of the present invention is to provide a PBX call forwarding device that allows calls to be received on an extension that is currently being used.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a means for detecting the call forward state of the called destination telephone, and a means for detecting the call forward state of the called destination telephone, and a means for detecting the call forward state of the called destination telephone when the called destination telephone is in the call forward state. A means of searching for a forwarding destination phone, and if the searched final forwarding destination phone is the phone that made the call, the final forwarding destination phone receives the call to the phone that forwards the call, and the final forwarding destination phone receives the call. The present invention is characterized by comprising means for receiving the call at the final transfer destination telephone when the telephone is not the telephone that made the call.

(Function) In the present invention, when a telephone receives a call, it is detected whether or not the telephone is in a call forward state, and if this telephone is in a call forward state, the final forwarding destination telephone is searched, and the final forwarding destination telephone is searched. If the destination phone is the phone that made the call, the call will be received on the phone that Callf leads as the final transfer destination phone, and if the final transfer destination phone is not the phone that made the call, the final transfer destination phone will receive the call. Make an incoming call to the phone.

(Example) Embodiments of the present invention will be described in detail below based on the drawings.

As shown in FIG. 1, a plurality of electronic key telephones (EKT) 1a to 1n are connected to a communication path network (
SW) 3. Further, this communication path network 3 is connected to the central office line through central office line trunk circuits (TRK) 4a to 4n. These call path networks 3
．． Line circuits 28 to 2n and central office trunk line N4a
4n is connected to the central processing unit [(CC) 6 via the control data bus line 5, and performs control operations using data stored in the memory device fl(MEN) 7.
The network 3 is configured to transmit and receive data between the key telephones 1a to 1n and to form communication paths between the key telephones 1a to 1n and the central office line via the network 3.

Now, as shown in FIG. 2, the key telephones 1a to 1n each include a handset 11, its hook mechanism 12, a dial mechanism 13, various service key buttons 14, and the like. This service key button 14 includes a CFD key 14a for specifying call forwarding and a CF key for canceling call forwarding.
It includes the D CAN key 14a and the like.

The call forward setting using the key telephones 1a to 1n is performed, for example, after hooking off the handset 11,
This is done by pressing the D key 14a and then operating the dial of the call forward destination. Further, this call forwarding is canceled by similarly pressing the CFD CAN key 14b and then operating the dial of the call forwarding destination.

Now, however, when dialing from the key telephone (EKT) 1a to another extension, the key telephone (EKT) 1b, the control flow shown in Fig. 3 and the schematic diagram of the call forwarding shown in Fig. 4 Explain with reference to.

When EKTla makes a call, this call information is sent to line circuit 2.
It is transmitted to the central processing circuit 6 via a.

In response to this call information, the central processing unit 6 transmits the EKT1a when the network 3 is in a line connectable state.
sends a dial tone to notify the user that dialing is possible. Then, the dial information given from EKTla by recognizing this dial tone 1if1 is similarly given to the central processing unit 6 via the line circuit 2a, and when the central processing unit receives the necessary number of digits of the above-mentioned dial information,
Determine whether the connection is between extension lines or a central office line. If the dial destination is an extension, it is checked whether the destination address is free or not, and if the destination address is free, a ring tone is sent to the destination terminal and a ringback tone is sent to the caller. In the case of a central office line connection, an empty trunk is selected and the calling terminal is connected to the empty trunk.

When the EKTla completes the extension dialing in this way (step 301), the central processing unit 6 checks whether the key telephone (EKT) 1b designated by the dial is to be forwarded (step 30).
2). Then, when EKTlb is not called forward, EKTlb is
Send ringback tone to Tla (step 303)
At the same time, a ring tone is sent to the EKTlb (step 30
4).

On the other hand, if EKTlb is called forward,
First, the central processing unit 6 checks whether the call forward destination of EKTlb is being called forward. Thereafter, in the same manner, the final call forwarding destination extension EKT1n and the final call forwarding destination extension EKT1x are checked (step 305). If the final call forward destination extension EKT1n is EKT
1a, that is, when the caller is confident (step 306)
, sends a ringback tone to EKTla (step 307), and sends the calling party to the extension EKT1x, which is the final call forward destination (step 307).
Step 308) Otherwise, as normal call forward processing, a ring bank tone is sent to EKTla (step 309) and the calling party is sent to the final call forward destination extension EKT1n (step 310).
.

Thus, with this system, it is possible to receive a call on the extension that forwards the call to the calling party, and eliminates the inconvenience of not being able to call the extension that forwards the call to the calling party, which was the case in the past. Also the fifth
In the office shown in the figure, EKTl, EKT2
and EKT3 are assigned to the executive, first secretary, and second secretary, respectively, and a call forward is set up from EKTl to EKT2. If the first secretary is busy at this time, by setting a call forward to the second secretary, all calls can be concentrated on the second secretary. Only when the second secretary deems the matter to be important, EKTl
Alternatively, by calling EKT2, the call can be received by EKT2. In this way, the first secretary can entrust complicated tasks to the second secretary. In this way, it is possible to achieve effective operation by taking advantage of the advantages of call forwarding.

〔Effect of the invention〕

As explained in detail above, according to the present invention, when the final call forward destination is the calling party itself, the call is not received by the calling party, but the call is delivered to the extension to which the calling party is forwarded. I can do it.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a private branch exchange, Figure 2 is a configuration diagram of a key telephone, Figure 3 is a diagram showing the control flow, and Figure 4 is a diagram showing the configuration of a key telephone.
An example diagram showing a call forward order. FIG. 5 is a diagram showing another call forward order. 1a to 1n...Key telephone, 2a to 2n...Line circuit, 3...Call path network, 4a to 4n...
- Office line trunk circuit, 5... control data bus line,
6...Central processing unit, 7...Storage device, 11...
Handset/receiver, 12...Hook mechanism, 13...Dial mechanism, 14...Service key button, '14a...CF
D key, 14b...CFD CAN key. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] Means for detecting a call forwarding state of a destination telephone; means for searching for a final transfer destination telephone when the destination telephone is in a call forward state; and a searched final transfer destination telephone. If it is the phone that made the call, the call is received at the phone that forwards the call to the phone that is the final destination, and if the phone that is the final destination is not the phone that made the call, the call is received on the phone that is the final destination. A call forwarding device for a private branch exchange, comprising: means for performing the following; and a call forwarding device for a private branch exchange.