JPS6180939A - Call forwarding call identification method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a call forwarding call identification method that enables call forwarding calls to be distinguished from other general calls in an automatic telephone exchange equipped with a call forwarding function. It is related to.

[Background of the invention]

In an automatic telephone exchange equipped with a call forwarding function, when a subscriber leaves his or her desk, he or she dials the call forwarding registration number and the telephone number for forwarding reception, thereby transferring incoming calls while the subscriber is away from the telephone to the telephone for forwarding call reception. Forward. In this case, whether the incoming call to the forwarded call reception phone is a forwarded call or any other call, the process leading to the call with the caller is the same, so it is impossible to distinguish between them. There are drawbacks to using this function, such as not only inconsistency in conversation with the telephone subscriber, but also unpleasant feelings for both parties.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for identifying a call that has been forwarded without a call, which eliminates the drawbacks of the prior art described above and which makes it easy to identify a call that is a call that has been forwarded.

[Summary of the invention]

The present invention is characterized in that, in the case of an incoming call that has been forwarded by call forwarding, the exchange has a function of outputting a call forwarding tone from the forwarding call reception telephone and then controlling the call to be made. It is.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows a connection system of an exchange to which the method of the present invention is applied. In the same figure, among subscribers 7 to 9, for example, subscriber 7
When a subscriber makes a call, the subscriber call information is transmitted to the central processing unit 5 through the signal distribution device 4. The central processing unit 5 selects an empty originating register 2 and transfers the subscriber 7 and all selected originating registers 2 to the route R within the switching net 7-71.
Connect via 1. As a result, a dial tone is sent to the subscriber 7 from the call register 2, and the subscriber 7 transfers the call to the forwarding call reception telephone 9, so the subscriber 7 registers the number for call forwarding registration and the telephone a9 for forwarding call reception. dial the user number. When the call register 2 receives the call transfer registration number and the subscriber number information of the transfer call reception telephone 9, the call register 2 sends these information to the central processing unit 5 through the signal distribution device 4. When the central processing unit 5 receives the information, it stores the subscriber number of the transfer call reception telephone 9 in the storage section corresponding to the subscriber 7 of the transfer destination storage section 10 on the main storage device 6 . When this storage is completed, registration completion information is sent from the central processing unit 5 to the transmission register 2 through the signal distribution device 4. When the transmission register 2 receives the registration completion information from the central processing unit 5, it sends a registration completion tone to the subscriber 7. The subscriber 7 hears the registration completion tone and learns that the registration for call forwarding is completed, and hangs up the handset, and the route R1 between the subscriber 7 and the calling register 2 is opened.

Next, when the subscriber 8 makes a call, the subscriber 8 and the calling register 2 are connected via the route R2 of the switching network 1 in the same manner as described above, and a dial tone is sent from the calling register 2 to the subscriber 8. It is assumed that subscriber 8 dials the subscriber number of subscriber 7 in order to call subscriber 7. The originating register 2 then receives the subscriber number of the subscriber 7 and sends it to the central processing unit 5 through the signal distribution device 4. When the central processing unit 5 receives the subscriber number of the subscriber 7, it reads the contents of the storage section corresponding to the subscriber 7 in the transfer destination storage section 10 of the main storage device 6.

Since the subscriber number of the transfer call receiving telephone 9 is stored in the storage unit corresponding to the subscriber 7, the central processing unit 5 selects the vacant mutual subscriber trunk 3, and connects the subscriber 8 and the outgoing call register 2. The route R of the switching network 1 between
2 is opened, and the subscriber 8 and the mutual subscriber trunk 3 are connected via the route R3 of the switching network 1, and this connection to the forwarding call reception telephone 9 and the mutual subscriber trunk 3 is shown to be a connection by missed call forwarding. Send call forwarding information and calling information of the called party. The former, ie, call forwarding information, is a feature of the present invention. The mutual subscriber trunk 3 holds the missed call forwarding information sent from the central processing unit 5, and sends a ringing tone to the subscriber 8 and a calling signal to the telephone set 9 for accepting the forwarded call using a known method. When the subscriber of the transferred call receiving telephone 9 answers, the subscriber mutual trunk 3
stops the ring tone and ringing signal, and since it holds the missed call forwarding information, it uses this information to send the missed call forwarding tone to the forwarded call reception telephone 9 for a certain period of time, and then communicates with the subscriber 8 and the forwarded call reception telephone 9. 9 communication paths are created to enable communication between these two parties. By listening to this call forwarding registration, the subscriber of the forwarding call reception telephone 9 learns that the call from the subscriber 8 is not a direct call to him or her, but is a call that has been forwarded to him by call forwarding. It becomes possible to have a conversation with the subscriber 8, keeping in mind that the call has been transferred.

FIG. 2 shows an embodiment of the mutual subscriber trunk 3 for performing the above operations. In the figure, relay A is a relay that monitors the supply of communication current to a caller other than the calling subscriber and the raising and lowering of the handset of the calling subscriber.

Contacts a0 to a4 are contacts of relay A, relay D is a relay that supplies communication current to the called subscriber and monitors whether the called subscriber lifts or lowers the handset, contacts d0 to d4 are contacts of relay D, and relay F is an AC relay that monitors the response of the called subscriber when the called subscriber is called, contact f0 is the contact of relay F, and relay G receives the calling signal sending information from the central processing unit 5 through the signal distribution device 4. Contact go-g3 is a contact of relay G, which is a relay that sends a calling signal to the called subscriber.

Relay CF is a slow recovery relay that receives call forwarding call information from central processing unit 5 through signal distribution device 4 and sends call forwarding tone to the called party. Contact points cf' to cf'' are relay CF.
Shows the contact points. In the above-described circuit, when attempting to connect the calling subscriber whose missed call has been forwarded to the called subscriber, the central processing unit 5 connects the calling subscriber to the terminal AO via the switching network 1. and connect to BO,
The called subscriber is connected via the switch network 1 to the terminal At
, connect to Bl.

When a calling subscriber is connected to terminals AO and BO, battery E - coil S of relay A - contact d' one terminal AO - switching network - calling subscriber's telephone loop - switching network one terminal B〇 - contact contact -1-Relay coil P-Relay A operates due to the ground air. Also, the central processing unit 5 sends missed forwarding call information and called party paging information through the signal distribution device 4, and the relays CF and G operate. When relay CF operates, relay CF becomes earth-
Contact a4 - Contact d3 - Contact cf2 - Relay CF - Battery E
Relay G is connected to earth - contact a3 - contact d2
- Contact g3 - Relay G - Battery E maintains operation. When relay G and relay A operate, a call signal - relay p contact q
0 - contact a0 terminal A1 - switching network - Peruvian switching network of the called subscriber's telephone - terminal B1 - contact a1 - contact g1 - resistor R - battery E A ringing signal is sent to the called subscriber and the called party is called. The bell on the subscriber's telephone rings. Contact g2 of relay G causes a ringing tone to be transmitted to the calling subscriber via coil T of relay A. When the called party picks up the handset and answers, relay F is activated.
Relay D operates with battery E, coil S of relay D, contact f0, coil P of relay D, and earth. When relay D operates, the operation holding circuit of relay G is cut off by contact d2, and relay G is restored. When relay G is restored, contact gZg”
As a result, the circuit for transmitting the paging signal to the called subscriber is cut off, the paging signal to the called subscriber is stopped, and the relay F is restored. Also, when relay D is restored, relay C is activated by contact d3.
F starts gradual recovery. This relay G is restored and relay C
During the time when F is slowly restored, the transferred call sound is induced by the transfer call contact Cf3 to the coil knee ground of relay D to the coils P and S of relay D by a known method and is sent to the called party. When relay CF completes slow recovery, contact cf3
This stops the transfer before the call and contacts cf' and cf' close, allowing the calling subscriber and called subscriber to talk.

The above explanation is for the case where the central processing unit 5 sends call forwarding call information, but if the calling subscriber is not forwarding the call, the central processing unit 5 sends the call forwarding information. Since the relay CF is not in operation, when the called subscriber answers, the call forwarding message is not sent to the called subscriber and the conversation is made with the calling subscriber. In the embodiment shown in Fig. 2, a voice before a forwarded call is used as the call forwarding tone to identify whether the call is a forwarded call or a call directly received by the caller. Alternatively, the effects of the present invention will not change even if music sounds from a music box or the like are used as identification sounds.

〔Effect of the invention〕

As explained above, according to the present invention, by providing the forwarding call information line, the call forwarding sound source, and the relay for sending the call forwarding sound from the central processing unit to the subscriber mutual trunk, the forwarding call accepting telephone is connected to the telephone. This service allows the caller to identify whether the call was forwarded to him or her directly, allowing him to answer the call more smoothly, and eliminating any lag in conversation with the calling subscriber, making the call forwarding service more comfortable. It has the effect of being able to provide

[Brief explanation of the drawing]

FIG. 1 is a connection system diagram of an exchange to which the method of the present invention is applied;
FIG. 2 is a circuit diagram showing an embodiment of a mutual subscriber trunk for implementing the present invention. DESCRIPTION OF SYMBOLS 1... Switching network, 2... Outgoing register, 3... Subscriber mutual trunk, 5... Central processing unit, 6... Main storage device, 7-9... Telephone set, C
F...Lire Patent Attorney Tadashi Akimoto Figure 1 1 Procedural Amendment (Chief) March 6, 1985

Claims (1)

[Claims] When an incoming call is received by a subscriber's telephone to a forwarding call acceptance telephone that is registered as the forwarding destination telephone for incoming calls to that telephone, if the incoming call is due to missed call forwarding, A function to identify and memorize that the incoming call is a call forwarding, and a call forwarding tone that indicates that the incoming call is due to a call forwarding when the forwarding call receiving telephone answers the call with a ring tone based on the incoming call. The automatic telephone exchange is provided with a function of connecting to the calling telephone that generated the incoming call after the incoming call is sent to the forwarding call receiving telephone, so that it can be determined whether the incoming call is due to call forwarding or not. A method for identifying call forwarding calls, characterized in that the call can be identified by the subscriber.