JPH0427245A - Incoming transfer control system - Google Patents

Abstract

PURPOSE:To gradually decrease the traffic quantity of an exchange by registering terminal equipment discriminating information related to an incoming transfer by the exchange related to an exchange processing, and using the terminal equipment discriminating information concerned for deciding whether it becomes the subsequent incoming transfer destination or not. CONSTITUTION:When an exchange 6 receives a transfer control information unit with an incoming transfer request from terminal equipments 2, 4, a store area reference means 12 of the exchange concerned 6 retrieves or refers to an incoming transfer list store area 8 and an incoming transfer list in-use display store area 10. When an in-use display is registered in its incoming transfer list in-use display store area 10, and also, terminal equipment discriminating information of an incoming transfer destination designated by the received transfer control information unit with an incoming transfer request is registered in the incoming transfer list store area 8, a call corresponding to the received transfer control information unit with an incoming transfer request is finished. Accordingly, a repeated transfer to the same terminal equipment of the transfer control information unit can be prevented, and this system is useful for decreasing gradually the traffic quantity or the degree of congestion of the exchange, and for reducing the processing load.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a call transfer control method that includes means for preventing repeated transfer of a transfer control information unit with a call transfer request to a terminal device designated for call transfer. The purpose of this is to prohibit the repeated transfer of transfer control information units with transfer requests, and prior to transferring information in transfer information units between terminal devices that can send and receive transfer control information units and transfer information units, In a digital switching network in which a transfer path is formed between terminal devices via an exchange in the switching control format to transfer information by sending and receiving transfer control information units transferred via a control transfer path formed between terminal devices via an exchange, The exchange is provided with a call transfer list storage area, a call transfer list in use display storage area, and a storage area reference means, and the call transfer list storage area and the incoming call are detected by the storage area reference means in response to reception of a transfer control information unit with a call transfer request. When referring to the transfer list in-use display storage area,
When an in-use indication is found in the call transfer list in use display storage area and registration of terminal device identification information of the call transfer destination specified in the received transfer control information unit with call transfer request is found in the call transfer list storage area; The configuration is such that the call corresponding to the received transfer control information unit with call transfer request is terminated.

[Industrial application field]

The present invention relates to a call transfer control system that includes means for preventing repeated transfer of a transfer control information unit with a call transfer request to a terminal device designated for call transfer.

The telecommunications network has changed from the traditional telephone/telegraph communication network to ■SD
N (Integrated 5service Dig
A progressive transition to the IT Network is being considered, and the technology is being developed. One component of the I5DN is a packet switch. One of the services that can be provided by a packet switch is a call transfer service.

[Conventional technology]

In the call transfer control system provided in a conventional packet switch, a call transfer sequence as shown in FIG. 6 is used to transfer a call from the first incoming packet terminal device to the next incoming packet terminal device. Incoming call transfer in the packet switching system will be explained with reference to FIGS. 5 to 8. The first incoming packet terminal bag from the originating packet terminal equipment (DTE) a! When placing a call to (DTE) b, a call request packet (hereinafter referred to as a CR packet) is sent to the packet exchange (DCE) (station) 20 (see 100 in FIGS. 6 and 8).

The packet switch 20 is configured to include a network 50, a main controller 52, and a main memory 54, as shown in FIG. The main memory 54 stores a program for controlling the sequences shown in FIGS. 6 and 8.
Execution of this program by the main controller 52 causes the network 50 to form the communication paths necessary to produce the sequences shown in FIGS. 6 and 8.

The CR packet carries data (CUDI), and the packet switch 20 that receives the CR packet sends a message to the incoming packet terminal device specified by the incoming packet terminal device address in the CR packet. An incoming call packet (hereinafter referred to as a CN packet) is sent out (see 102 in FIGS. 6 and 8). This CN packet also carries data (CUDI). The incoming packet terminal device normally sends out an incoming call acceptance packet (hereinafter referred to as a CA packet) as shown in FIG. 8 (see 103 in FIG. 8), and the packet switch 20 that receives and receives the CA packet , a connection completion packet (hereinafter referred to as a CC packet) is sent (see 105 in FIG. 8) to form a data link between the outgoing packet terminal device a and the incoming packet terminal device A, and a data link is established between the two. packet data transfer (see 107 in FIG. 8).

When this packet data transfer is completed, a recovery request packet (hereinafter referred to as a normal CC packet) (see (B) in FIG. 7) is sent from the incoming packet terminal bag 2b (see 109 in FIG. 8). The packet switch 20 that received the CC packet sends a disconnection instruction packet (hereinafter referred to as a CI packet) to the originating packet terminal device a (see 111 in FIG. 8). A disconnection confirmation packet (hereinafter referred to as CF packet) is sent from the outgoing packet terminal bag ga to the packet switch 20 (11 in FIG. 8).
3), and the CF packet is transferred from the packet switch 20 to the incoming packet terminal device (see 11 in Figure 8).
(see 5).

If the incoming packet terminal device that received the above-mentioned CN packet wants to forward the call, the above-mentioned CN packet should be forwarded.
In response to receiving N packets, the normal packet 'y
Instead of returning the CA packet to the client exchange 20 to form the data link as described above and transferring the packet data, the incoming transfer destination request CQ packet ((A
)) (see 104 in FIG. 6). This CQ
The packet also carries data (CUD2).

The packet switch 20 that has received the CQ packet sends a CN packet to the incoming packet terminal device C specified by the incoming packet terminal device address in the CQ packet (see 106 in FIG. 6). Data (CUD2) is also carried in the 20CN packet.

In this incoming packet terminal device jc, when requesting incoming call transfer in the same way as in the case of the incoming packet terminal device jc, it sends out an incoming call transfer destination request material CQ packet in the same manner as described above (108 in FIG. 6). reference). This CQ packet also carries data (CUD3). The CQ
The packet switch 20 that has received the packet sends a CN packet to the incoming packet terminal device specified by the incoming packet terminal device address in the CQ packet (see 110 in FIG. 6). This CN packet also carries data (CUD3).

At this time, the incoming packet terminal bag vb assumes that it has completed the necessary information transfer using the control packet and, unlike the previous case, sends out a normal CQ packet (see 112 in FIG. 6).

Packet switch 2 that received this normal CQ packet
0 sends a CI packet to the incoming packet terminal device a (see 114 in FIG. 6), while sending out a CF packet to the incoming packet terminal device A (see 116 in FIG. 6), The originating packet terminal device a that has received the CI packet sends the CF to the packet switch 20.
The packet is returned (see 118 in Figure 6).

Such incoming call transfer control can also be performed in a packet switch.

[Problem to be solved by the invention]

In call transfer control using the conventional packet switching system as described above, each time the packet switch receives and receives the above-mentioned call transfer destination request CQ packet, the packet switch receives and receives the CQ packet until the call transfer request is completed. Incoming calls will continue to be forwarded to the packet terminal device specified by the forwarding destination address. Therefore, since such incoming call transfer control can be performed, only the incoming call transfer control packets transferred as described above are transferred without entering the data transfer phase and transferring data using data packets. Using,
Although the amount of data to be transferred is small, data can be transferred. In the packet switching network, there is no charge for the transfer of the incoming call transfer control packet between the packet switch and the packet terminal device. or,
When such control packets go back and forth through the packet switch, the amount of traffic or the degree of congestion of the packet switch increases, and the processing load thereof increases.

The present invention was created in view of such technical problems, and an object of the present invention is to provide a call transfer control method that prohibits repeated transfer of transfer control information units used for transfer of calls to the same terminal device. .

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention. In FIG. 1, the present invention provides an information unit exchange control type exchange 6 prior to transferring information in transfer information units between terminal bags f2.4 that can send and receive transfer control information units and transfer information units. A digital exchange in which a transfer path is formed between the terminal devices via the exchange 6 to transfer the information by sending and receiving transfer control information units transferred via a control transfer path formed between the terminal devices 2 and 4 via the exchange 6. The exchange 6 of the network is provided with a call transfer list storage area 8, a call transfer list in use display storage area 10, and storage area reference means 12. Then, when the storage area reference means 12 refers to the call transfer list storage area 8 and the call transfer list in use display storage area 10 in response to the reception of the transfer control information unit with call transfer request, the call transfer list in use display is displayed. Storage area 10 in use display,
And when the registration of the terminal bag W identification information of the call transfer destination specified in the unit of the received transfer control information with a call transfer request is found in the call transfer list storage area 8, the received transfer control information with a call transfer request is found. The present invention is configured to terminate calls for each unit.

[For production]

When the exchange 6 receives a transfer control information unit with a call transfer request from the terminal devices 2 and 4, the storage area reference means 12 of the exchange 6 stores the call transfer list storage area 8 and the call transfer list in use display storage area lO. Search or refer to. The in-use display is registered in the in-call transfer list in-use display storage area 10, and the terminal bag W of the incoming call transfer destination specified by the received transfer control information unit with incoming call transfer request is stored in the incoming call transfer list storage area 8. If @separate information is registered, the call corresponding to the received transfer control information unit with incoming call transfer request is terminated.

Therefore, it is possible to prevent the transfer control information unit from being repeatedly transferred to the same terminal device. Therefore, it is useful for gradually reducing the amount of traffic or the degree of congestion of the exchange, and for reducing the processing load.

[Example] An example of the present invention will be described below using FIGS. 2, 3, and 4. FIG. 2 shows an embodiment of the present invention, and the system configuration of this embodiment differs from the system configuration of FIG. 5 in the following points.

The main memory 54 shown in FIG. 5 also stores a program for executing the process flow of the incoming call transfer control of the present invention shown in FIG. Further, the main memory 54 is provided with an incoming call transfer list storage area 56 and an incoming call transfer list in use display storage area 5 days. In other respects, it is the same as in FIG. 5, so components that are not particularly shown but are necessary for the explanation of the present invention are given the same reference numerals as in FIG. 5, and the explanation thereof will not be repeated.

In FIGS. 2 and 3, packet terminal devices a and b
, c correspond to the terminal device 2.4 in FIG. 1, and the packet switch 20 corresponds to the switch 6 in FIG. The call transfer list storage area 56 of the packet switch 20 corresponds to the call transfer list storage area 8 of FIG. 1, and the call transfer list in use display storage area 58 of the packet switch 20 corresponds to the call transfer list in use display area 58 of FIG. Corresponds to the display storage area 10. The main controller 52, the main memory 54, and the third
The program that executes the process flow of the incoming call transfer control of the present invention shown in the figure corresponds to the storage area reference means 12 in FIG.

The incoming call transfer operation of the present invention having the above system configuration will be described below.

For convenience of explanation, a description will be given of a call transfer operation under the same call transfer conditions as in the example shown in FIG. Therefore, the operations up to reference numeral 104 in FIG. 4 are the same as those described with reference to FIG. The packet switch 20 that received the incoming call transfer destination request CQ packet determines that the CQ packet is an incoming call transfer request packet (see 81 in FIG. 3), so at this time, the first incoming packet For the terminal device A and the incoming call forwarding packet terminal device C, it is determined whether the incoming call forwarding list in use display has been registered in the incoming call forwarding list in use display storage area 58 (see 82 in FIG. 3). . At this time, the incoming call forwarding list is not registered to indicate that it is in use (see unused 83 in Figure 3). Transfer list storage area 56 (see 34 in FIG. 3).

Then, the display indicating that the call forwarding list is in use is registered in the call forwarding list in use display storage area 58 (see 85 in FIG. 3).
. Thereafter, in the same manner as explained with reference to FIG. 6, a CN packet is sent to the packet terminal device C specified by the incoming transfer destination address of the incoming transfer destination request material CQ packet (see FIG. 3). 36, see 106 in Figure 4).

The packet terminal device IC, which receives and receives the CN packet, sends the incoming call transfer destination request CQ packet to the packet switch 20 in the same manner as in the conventional case (see 108 in FIG. 4).

In the packet switch 20, regarding the received call transfer destination request CQ packet, the same process as when receiving the call transfer destination request CQ packet from the bucket 1[floor device jc is performed. If you refer to the registered contents of the incoming call transfer list in use display storage area 58, it is determined that the registered contents are in use (see 83 in use in FIG. 3), so the incoming call forwarding list storage area 56 is also Referring to the incoming call transfer destination address, that is, the address of the packet terminal device, it is determined whether or not the identification information of the incoming packet terminal device that is the incoming call transfer destination is registered (see 37 in FIG. 3).

If the registration has been completed (see the presence of 38 in FIG. 3), the packet switch 20 sends CI packets to the packet terminal device a and the packet terminal device c (the fourth
(Refer to 114 and 115 in the figure) Perform the call disconnection process (
(See 39 in Figure 3). From the outgoing packet terminal device a,
A CF packet is returned in the same manner as described above (1 in Figure 4).
(see 18). This makes it possible to prevent data transfer using packet exchange control packets.

If it has not been registered (see 88 not registered in FIG. 3), the packet switch 20 adds the identification information of the packet terminal device corresponding to the received call transfer destination address of the received call transfer destination request material CQ packet to the call transfer list. It is registered in the storage area 56 (see 310 in FIG. 3).

In addition, in the above embodiment, the implementation was based on a packet switching system;
It can also be implemented in a nous Transfer Mode) exchange system.

[Effects of the Invention] As described above, according to the present invention, upon first reception of a transfer control information unit of a predetermined data length indicating incoming call transfer, the exchange involved in the exchange processing identifies the terminal device associated with the incoming call transfer. Since the information is registered and the terminal device identification information is used to determine whether the terminal device is a subsequent call transfer destination, it is possible to prevent the transfer control information unit from being repeatedly transferred to the same terminal device. Therefore, it is useful for gradually reducing the amount of traffic or the degree of congestion of the exchange, and for reducing the processing load.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the present invention; Fig. 2 is a diagram showing an embodiment of the present invention; Fig. 3 is a diagram showing a processing flow of an embodiment of the invention;
Figure 5 is a diagram showing a processing sequence of an embodiment of the present invention; Figure 5 is a diagram showing a packet switching network that provides a conventional call transfer service; Figure 6 is a diagram showing a conventional call transfer sequence; Figure 7 is a diagram showing a conventional call transfer sequence. is a diagram showing the format of a CQ packet, and FIG. 8 is a diagram showing a packet data transfer sequence in the packet switching network of FIG. 5. In FIGS. 1 to 3, 2.4 is a terminal device (packet terminal devices a, b, c),
6 is a switch (packet switch 20), 8 is a call transfer list storage area (packet switch 20's call transfer list storage area 56), and 10 is a call transfer list in use display storage area (packet switch 20's call transfer list is in use). display storage area 58), 12 storage area reference means (main controller 52, main memory 54);
, a program that is stored in the main memory 54 and executes the processing flow of the incoming call transfer control of the present invention shown in FIG. , see - 溌f@■shio, Rif Lock's misfire e eyes - 軻〃iro 1ri・1 2nd figure 50 month's laughter ``evening base 1 irises i ≠ 2 sheeb〉 person Figure 4 Multi-way - To's shyness f2 sea 7 person Figure 6 CO1 partner Φ four Zt begging 73/lX) 7th
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Claims (1)

[Claims] (1) Prior to transferring information in units of transfer information between the terminal devices (2, 4) capable of sending and receiving transfer control information units and transfer information units, an information unit exchange control type exchange (
6) and a control transfer path formed between the terminal devices (2, 4) to transfer the information by transmitting and receiving the transfer control information unit to the terminal device via the exchange (6). In the digital switching network formed between the switching equipment (6), a call transfer list storage area (8), a call transfer list in use display storage area (10), and a storage area reference means (12) are provided, and a call transfer request is made. The incoming call forwarding list storage area (8) and the incoming call forwarding list in use display storage area (10) by the storage area reference means (12) in response to the reception of the attached forwarding control information unit.
When referring to the incoming call forwarding list in use display storage area, and the incoming call forwarding destination terminal device identification information specified by the received forwarding control information unit with a call forwarding request in the incoming call forwarding list storage area. A call transfer control system characterized in that when registration is found, the call corresponding to the received transfer control information unit with call transfer request is terminated.