JPS6020945B2 - Incoming call display method during call forwarding registration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to incoming calls in a telephone exchange having a call forwarding function.

If you receive an incoming call on a phone that is registered for call forwarding,
Incoming calls arrive directly at the registered forwarding destination, and a ringing signal is sent only to the forwarding destination telephone.

Therefore, if you forget to cancel call forwarding when it is no longer necessary, you will not be able to directly know even if there is an incoming call to this phone, and the caller and the person to whom you are forwarding will suffer both physically and mentally. The drawback was that it caused trouble. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a system for displaying the fact that a call has been received even to a telephone set that is registered for call forwarding, in order to eliminate such drawbacks.

The incoming call display method during call forwarding registration according to the present invention, when an incoming call is received to a telephone set during call forwarding registration, sends a ringing signal to the forwarding destination telephone and also sends a ringing signal for a certain period of time,
During this time, if the registered phone goes off-hook, it emits a normal ring tone or a special sound in its place (hereinafter collectively referred to as the forwarding destination phone ringing tone), thereby indicating that the transfer destination phone has received an incoming call. be.

A very effective application of the present invention is that when the telephone is off-hook in response to an incoming call displayed as described above, if the forwarding destination telephone is ringing, the forwarding destination telephone ringing tone is transmitted to the present telephone. When the transfer destination phone hears a ringing tone, the user dials a special number from the main phone, interrupting the call on the transfer destination phone, and connects the incoming call to the main phone. It is.

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram of a relay system of a subordinate system shown for comparison in order to clarify the features of the present invention. In the conventional system, when a call is received from the incoming trunk ICT to telephone A, the central control unit CCO searches the transfer information registration device CFVE and detects that call forwarding from telephone A to telephone B is registered. The telephone B and the trunk RGTI exclusively for transmitting a calling signal are connected as shown by b. Because of this configuration, if you neglect to cancel call forwarding registration when it is no longer necessary, the called party will not be able to know even if there is an incoming call. Therefore, as mentioned above, not only does it cause inconvenience to the caller and the person on the transfer destination, but also when the transfer destination is not busy or the transfer destination is away, the incoming call is not answered for any length of time. The state of not being able to know what happened will continue. FIG. 2 shows a relay system diagram of one application example in which the present invention is implemented.

In this case, the fin talking machine B and the trunk RGTI for sending out the calling station number
There is no difference from the subordinate method until the connection shown by b is made between the two. In the present invention, at the same time as the above-mentioned connection, the telephone set A and the trunk ROT2 dedicated for sending out a ringing signal are further connected by a link c. This trunk RGT2 is particularly used in the present invention,
Preferably, the calling signal is different from the normal calling signal mentioned above, for example, a continuous tone (special tone). Therefore, even if you neglect to cancel your call forwarding registration,
If you hear this line sound, you will notice this and can immediately cancel your registration. It should be noted that the calling signal may be a normal calling signal instead of being specially different as described above. In this case, if you go off-hook, you can save money on the call, but it is not normal for the ringtone to be able to be used at this point, so at least those who registered for call forwarding will immediately realize that they neglected to cancel it. . However, in the above configuration, communication based on the incoming call at that time is possible only through the transfer destination telephone set B.

Therefore, in this case, it would be even more preferable if telephone A could be used to answer the call. To further explain FIG.
At the same time as connecting GT2, telephone B and incoming trunk I
The link a between the CTs is selected and the selection information is stored in the storage device MI provided in the central controller CC. At this time, information indicating that the transfer destination telephone B is currently ringing is stored in the storage device M2 of the missed transfer registration device CFVE. On the other hand, the central control unit CC uses the call forwarding registration device CF for the trunk RGT2 exclusively for sending out calling signals connected to the registered telephone A.
Activate the time limit monitoring circuit RGTM in VE. After transmitting the paging signal for a certain period of time, the paging trunk RGT2 is restored, and the connection is ultimately the same as the conventional case shown in FIG. In this situation, subscriber A
takes telephone A off-hook in response to the above-mentioned ringing signal, the central control counterfeit CC retrieves the contents stored in memory M2, and uses the information identifying that the above-mentioned forwarding destination telephone is ringing to cause the forwarding destination telephone to ring. When it detects that something is going on inside, it connects the crab phone A and the newly selected outgoing register trunk ORT as shown by d, and sends out a calling signal that makes a special sound to the phone A.

When subscriber A dials a predetermined special number after confirming the special tone, the central control Ryoreki CC connects T to telephone A and the incoming trunk by e, and connects telephone B to the ringing signal sending trunk RGTI. The connection is canceled, the selected link information between the incoming trunk ICT and the telephone set B is deleted from the storage device MI, and the ringing display information of the forwarding destination telephone set is deleted. As described above, according to the configuration shown in FIG. 2, subscriber A can not only know that there is an incoming call while registering for call forwarding, but also be able to send the incoming call to his own telephone. 0 can be responded to at A.

Figure 3 shows a call forwarding registration device ℃FVE equipped with a time limit monitoring circuit RGTM for restoring the calling number sending trunk RGT2 after a certain period of time after activation, and a storage function for the ringing display information of the forwarding destination telephone. A specific example of a circuit when releasing is shown below.

In the figure, the registered telephone accommodation location information memory CFO and the forwarding destination telephone accommodation location information memory CFD are designated with a memory address and a registered data write pulse by the central controller CC, and the registered telephone location information memory CFO and transfer destination telephone accommodation location information memory CFD are designated with a memory address and a registered data write pulse by the central control unit CC. Phone installation/falsification information and forwarding destination telephone installation position information are stored. When an incoming call is received on a telephone during registration, the central control unit CC translates the address information for reading out the transfer destination telephone accommodation location memory from the telephone accommodation location information, and sends it to the data transfer registration device CFVE along with a read pulse. . When the call forwarding registration device receives the address information, it reads out the location information using the relevant forwarding telephone and sends it back to the central control device CC. The central control unit uses this forwarding destination telephone accommodation location information and the selected trunk RG for empty ringing signal transmission only.
From the accommodation position information of T, a link connecting the two is selected and connected. Next, the central control unit CC sends the address information and the ringing indication write pulse to the ringing indication memory RGF of the destination telephone set, and sets "1" to the corresponding bit. When the above operation is completed, the central control unit CC selects another trunk RGT for transmitting an empty call number, and connects the registered telephone to this trunk.

At this time, the address information and timer set pulse are sent to the missed transfer registration device CFVE again. In the missed transfer registration mode, the address information is expanded to addresses 0 to 255 by the decoder DR, and the relevant time limit monitoring circuit RGTM is activated. At this time, the eye monitoring circuit counts a certain number of clock pulses and outputs timeout information and sends it back to the central control unit CC.At the same time, the address information, which has been converted back to 8 bits by the decoder RDR, is generated by the OR gate RP in the figure. Registered telephone housing location information memory C along with read pulse
Enter in FO. By this input, the registered telephone accommodation position information is read out, and this information is also sent back to the central control unit CC. The central control unit restores the calling signal sending trunk RGT connected to the registered telephone and the link therebetween based on the registered telephone accommodating information and timeout information. On the other hand, if the transfer destination phone goes off-hook,
The central controller CC restores the link between the forwarding destination telephone and the ringing signal sending trunk RGT, and connects the incoming trunk IC.
The link between T and the forwarding destination telephone is connected, but at the same time, the forwarding destination telephone ringing display memory RO of the call forwarding registration device is connected.
Sends the address information and memory clear pulse corresponding to the destination mother phone to T, and changes the memory from “1” to “
Reroof to 0”.

When the registered telephone is taken off-hook, the central control unit CC sends the address information and a ringing display read pulse to the forwarding destination telephone's ringing display memory RGF of the call forwarding registration device, and receives the memory contents as output. .

If the output is "1", it means that the transfer destination telephone is ringing, and the above-mentioned calling register trunk ORT sends out a ringing signal that emits a special tone to the registered telephone, and if the output is "0", a general dial tone is sent. do. Brief explanation of the drawings Fig. 1 is a relay system diagram of a conventional call forwarding registration display system, Fig. 2 is a relay system diagram of an embodiment of the present invention's call forwarding registration system incoming call display system, and Fig. 3 1 is a diagram showing an example of a circuit of a call forwarding registration device CFVE used in the system of the present invention.

Explanation of symbols: A is a call forwarding registration telephone, B is a call forwarding destination telephone, ICT is an incoming trunk, ROT is a trunk dedicated to sending call information, ORT is a calling register trunk, CC is a central control unit, CFVE is a call forwarding registration equipment , M indicates a memory, and RGTM indicates a time limit monitoring circuit, respectively.

Figure 1 Figure 2 figure 〇 Bran

Claims (1)

[Claims] 1. When a telephone exchange that has a call forwarding function receives a call to a telephone that is registered for call forwarding, it sends a ringing signal to the forwarding destination telephone and also sends a ringing signal to the registered telephone for a certain period of time. A method for displaying an incoming call during missed call transfer registration, characterized in that if the registered telephone goes off-hook, a ringing tone is emitted from the forwarding destination telephone, thereby indicating an incoming call to the forwarding destination telephone.