JPH0435250A - Multi-stage relay communication method - Google Patents

Abstract

PURPOSE:To avoid occurrence of relay communication occurred infinitely from communication stations connected in a loop by adding its own identification information to relay information, sending the result and allowing each communication station to discriminate the end of the multi-stage relay communication depending whether or not the identification information of a communication station to be relayed next is added to the relay information. CONSTITUTION:Plural communication stations each having an incoming call transmission function and a relay function are interconnected in a loop by lines, and a request station requesting multi-stage relay sends relay information representing a relay station to be passed through and a call destination and the relay station executes multi-stage relay according to the relay information. Then its own identification information is added to the relay information and the result is sent to a communication station being a next relay station and each communication station discriminates the end of multi-stage relay communication by discriminating whether or not the relay information has the identification information of the communication station to be relayed next. Thus, the occurrence of relay communication infinitely in the multi-stage relay communication of the communication stations connected in a loop is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-stage relay communication system, and particularly to a multi-stage relay communication system in communication stations connected in a loop.

[Conventional technology]

Recently, communication networks have developed and their types are increasing.

When communicating using such a communication network, communication may be performed using a plurality of communication networks depending on the communication destination, and in this case, the communication becomes relay communication. In other words, when transmitting from a communication station connected to one network to a communication station connected to another network, if the networks are different, direct transmission is not possible, and both the destination network and the source network Transmission is performed by relay transmission using a communication station connected to as a relay station.

A communication station requesting relay communication adds its own identification information (telephone number, ID number, etc.) as transfer destination terminal information and request station information, and requests the relay station for transfer. Additionally, when requesting incoming call forwarding as part of multi-stage relay communication, the requesting station adds terminal information managed by each relay station at the multi-stage relay destination to the terminal information and sends it to each relay station sequentially. Indicates the station's data transfer destination.

[Problem to be solved by the invention]

However, in such a conventional multi-stage relay communication system, the relay form is, for example, as shown in FIG. In the case of the network 1, when multi-stage relay communication is performed, a problem arises in that data transfer is repeated endlessly in a loop.

That is, for example, communication terminals 81 to B3, C1 to C3, D1 to C1D connected from communication station A to communication station B and C1D
When requesting data transfer to D3, communication station A sends the information of the communication terminal to which the incoming call will be transferred together with the relay station to communication station B.
When the communication station B transmits the data to the communication terminals 81 to B3, the communication station B transmits the transfer destination information received from the communication station A to the communication station C, which is the next relay station. Similarly, communication station C
In 1D, data transfer and transmission of transfer destination information are repeatedly executed. At this time, the forwarding destination information sent from communication station A is returned from the communication station to communication station A, and communication station A confirms that the forwarding destination information received from the communication station is the information that it sent itself first. Since the determination cannot be made, multi-stage relay transmission from communication station B to communication station A via communication station A is repeated again, and relay communication continues forever.

[Purpose of the invention]

Therefore, in the present invention, a requesting station that requests multi-stage relay transmits relay information instructing the relay station to be passed through and the incoming call transfer destination, and the relay station executes multi-stage relay according to the relay information, and
It adds its own identification information to the relay information and sends it to the communication station that will become the next relay station, and each communication station determines whether or not the relay information has the identification information of the communication station to be relayed next added to it. By determining the end of multi-stage relay communication by determining the end of multi-stage relay communication, it is possible to avoid the occurrence of endless relay communication in multi-stage relay communication of communication stations connected in a loop, and improve the reliability of multi-stage relay communication system. The purpose is to

[Means to solve the problem]

In order to achieve the above objective, multiple communication stations having call forwarding and relay functions are interconnected in a loop via lines, and each communication station instructs the relay station and call forwarding destination. In a multi-stage relay communication method that performs multi-stage relay within a loop and transfers data to a communication terminal connected to a communication station, when each communication station requests the multi-stage relay, it sends its own identification information and the received information as the requesting station information. A communication station that has received the relay information specifies its own communication station as a relay station, and then transmits predetermined relay information that specifies the communication terminal to which the call is transferred. is instructed, the data is transferred to the communication terminal according to the instruction, and the identification information of the own communication station is added to the relay information and transmitted to the communication station that will be the next relay station, and each communication that is sequentially relayed. Each station similarly performs data transfer and additional transmission of its own identification information, and when each communication station receives relay information, it performs multi-stage relay depending on whether or not the identification information of the communication station to be relayed next is added. This method is characterized by determining the end of communication.

Hereinafter, a detailed description will be given based on examples.

FIG. 1.2 is a diagram showing an embodiment of the multi-stage relay communication system of the present invention, and this embodiment is applied to the network 1 shown in FIG. 3 above.

In FIG. 3, communication stations A, B, C, and D each have a relay function and a call transfer function, and each communication station A, B, C, and D has communication terminals Al-A3, Bl to B3, and C1. ~C3, DI
=D3 is connected.

In addition, each communication station A, B, C, and D
The relay requesting station file shown in the figure and the relay receiving station file shown in FIG. 2 are transmitted. In the relay request station file, the communication station making the relay request first enters its own station number as the request station number in the request station number field, and the relay receiving station file contains the corresponding abbreviated number of the communication terminal managed by the transfer destination communication station. , ID number, etc., and send it.

Next, the effect will be explained.

Now, when communication station A becomes a relay relying station and transmits the relay relying station file and relay receiving station file as relay information to communication station B, communication station B as a relay station transmits the contents of the relay receiving station file. If it is confirmed that it is not an incoming call transfer instruction, a call is made to the communication terminals 81 to B3 designated as relay receiving stations and data is transferred. Further, even if there is an incoming call transfer instruction, if there is no relay instruction, a call is made to the communication terminals B1 to B3 and data is transferred. In addition, there is a call forwarding instruction, and
If there is a relay instruction, communication station B checks whether the station number of communication station C is entered in the relay station column of the relay request station file. If it is entered, the relay to communication station C is It is determined that the data has been completed, relaying to communication station C is stopped, and only data transfer to communication terminals 81 to B3 is executed.

If not entered, data transfer to 11 communication end terminals 1 to B3 is executed, and the station number of communication station B is entered in the relay station 1 column of the relay station file and becomes the next relay station. It is transmitted to communication station C.

At this time, when communication station B requests data transfer from communication terminals 01 to C3 connected to communication station C, the relay receiving station file contains the abbreviated number, ID number, etc. of the communication terminal. A new file is created and sent to the communication station C together with the relay transfer file. Communication station C and communication station RI execute the same relay processing and incoming call transfer processing as communication station B, and the station numbers of communication stations C and D are added to the relay station 2.3 column of the relay requesting station file. . In this example,
At the communication station that is the last relay station, even if there is an incoming call transfer instruction and a relay instruction in the relay receiving station file, the station number for the communication station is entered in the requesting station column of the relay requesting station file, so communication station A The communication is terminated without being relayed to.

Similarly, when communication stations B, C, and D become dependent stations, similar multi-stage relay processing is executed and the relay processing ends at the last relay station.

Therefore, by applying the present invention, it is possible to reliably avoid a situation where relay processing is continued indefinitely even in multi-stage relay communication in the loop network 1, and all Using multi-step relay communication can shorten the time it takes to transfer data rather than sending subsequent reports to communication terminals sequentially, and there is no need to specify all transfer destinations when requesting multi-step relay communication. Therefore, the operational burden on the operator can be reduced. As a result, the reliability of the multi-stage relay communication system can be improved.

Additionally, if network 1 receives a multi-stage relay request from an external communication station, the station number of a communication station that is not within the loop is entered in the request station column of the relay request station file and is sent; Since the station numbers of the relay stations are entered sequentially in the relay station column of the relay dependent station transfer file, when relaying is performed again after going around the loop, each communication station A, B, C that becomes a relay station , D, since the station number of the next relay station has already been input into the relay station file, the relay is immediately terminated. Therefore, even if there is a request for multi-stage relay communication from a communication station outside network l, it is possible to avoid a situation where relay communication is continued permanently within the loop.

Furthermore, if each relay station above sends a relay result report to the requesting station number in the relay chain file when the relay is completed, the requesting station can automatically know the relaying result, and the multi-stage relay communication The convenience of the method is further improved.

[Effects] According to the present invention, a dependent station requesting multi-stage relay transmits relay information indicating the relay station to be passed through and the destination of the incoming call, and the relay station executes multi-stage relay according to the relay information, and Adding its own identification information to the information and transmitting it to the communication station that will become the next relay station, and each communication station determines whether or not the identification information of the next communication station to be relayed is added to this relay information. Since the termination of multi-stage relay communication is determined by the following, it is possible to avoid the occurrence of endless relay communication in multi-stage relay communication of communication stations connected in a loop, and improve the reliability of the multi-stage relay communication system. can be done.

[Brief explanation of drawings]

Fig. 1.2 is a diagram showing an embodiment of the multi-stage relay communication system according to the present invention, and Fig. 1 shows an example of a relay dependent station file exchanged between communication stations in the multi-stage relay communication system. FIG. 2 is a diagram showing an example of a relay receiving station file exchanged between communication stations in the multi-stage relay communication system. FIG. 3 is a diagram showing an example of a loop-like network in which a conventional multi-stage relay communication system is implemented. 1...Network,

Claims (1)

[Claims] A plurality of communication stations having a call forwarding function and a relay function are interconnected in a loop via a line, and each communication station instructs a relay station or a call forwarding destination to connect the loop. In a multi-stage relay communication method in which data is transferred to a communication terminal connected to a communication station by performing multi-stage relay within the communication station, when each communication station requests the multi-stage relay, it sends its own identification information and incoming call as requesting station information. transmitting predetermined relay information instructing a transfer destination communication terminal, and the communication station receiving the relay information having its own communication station designated as a relay station in the relay information;
When the communication terminal to which the incoming call is to be forwarded is specified, the data is transferred to the communication terminal according to the instruction, and the identification information of the own communication station is added to the relay information, and the data is transferred to the communication station that will become the next relay station. Each communication station that transmits and relays data in turn similarly transfers data and additionally transmits its own identification information,
Further, the multi-stage relay communication method is characterized in that, when each communication station receives the relay information, it determines whether the multi-stage relay communication is finished depending on whether identification information of the communication station to be relayed next is added.