JPH0750899B2 - Method of message delivery from storage and exchange equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use of the Invention] The present invention relates to a receiving side when a store-and-exchange device, a non-store-and-exchange device existing between terminals on the receiving side, or a changeover switch is in a relay-disabled state. The present invention relates to a method of delivering a message from a storage / exchange apparatus, in which an incoming call request from the storage / exchange apparatus based on a message from a transmitting side terminal is stopped.

[Background of the Invention]

Up to now, the message from the sending side terminal, which has been stored in the storage and switching apparatus, cannot be delivered to the receiving side terminal from the storage and switching apparatus for some reason even after retrying a specified number of times. In this case, for example, the paper “Service Functions of New Facsimile Communication Systems and Their Applications” (Business Communication, '84, Vol. 21, No. 7, p44-4
As described in 8), the non-delivery message is returned to the sender terminal as the message sender.

The message delivery method according to the prior art will be described in more detail with reference to FIG.

That is, in the example shown in FIG. 3, the terminals 41 to 4n are connected via the ordinary exchange (non-stored exchange) 2 and the transmission lines 71 to 7j.
Although a system configuration in which 31 to 3 m are directly accommodated in the store-and-exchange device 1 is assumed, in order to send a message from the terminal 31 to the terminal 41 under such a system, for example, from the sending terminal 31 The message is temporarily stored in the storage file device 11 in the storage exchange device 1. Thereafter, the message from the terminal 31 stored in the storage file device 11 is delivered (transmitted) from the storage / exchange device 1 to the receiving-side terminal 41 via the exchange 2, but at that time, the message is received. When the side terminal 41 is in the unreceivable state due to some reason (busy, trouble occurrence, reception recording paper out, etc.), the storage and exchange device 1 performs retry transmission a predetermined number of times. Has become. If the message cannot be delivered to the receiving terminal 41 even after the specified number of retries, the message to the receiving terminal 41 is deleted from the storage file device 11 for the first time, and the message is sent from the message sending source. A non-delivery message is returned from the store-and-forward device 1 to the sending terminal 31. Incidentally, the fact that the message is undelivered is also displayed on the console 12 attached to the storage and exchange apparatus 1.

By the way, the non-delivery process described above is performed even when the exchange terminal itself is in a relay disabled state due to some failure, even if the receiving side terminal itself is in a receivable state. The non-delivery process is also performed when a changeover switch is interposed between the storage and exchange device and the receiving side terminal, and when the receiving side terminal is connected to another switching network by the changeover switch. Up to this point, even if the receiver side fails to reach the delivery due to some reason, the storage and exchange device cannot determine the reason for the failure as a check, and it is uniform regardless of the reason for the failure. The non-delivery process was taken. Therefore, even if there is a cause of non-delivery in the exchange itself or the changeover switch itself, since the non-delivery message is returned to the sending terminal, the same content is sent again from the sending terminal based on the non-delivery message. When there is a non-delivery factor in the switch itself or the changeover switch itself, such as the need to send and store the message to the store-and-exchange device, the sending terminal frequently sends messages of the same content to the store-and-exchange device. It has to be transmitted and stored.

[Object of the Invention]

It is an object of the present invention to perform unreasonable non-delivery processing in a storage / exchange device when there is a non-delivery factor in the exchange / exchange device or the switching device itself interposed between a receiving side terminal and the changeover switch itself. In order to prevent a non-delivery message from being sent back to the sending side terminal, a message delivery method from the storage and switching device is provided.

[Outline of Invention]

The purpose of the above is to store and exchange equipment and exchanges (non-storage and exchanges).
If the notification from the switch indicates that the relay to the receiving terminal is disabled, or if the changeover switch reports that the receiving terminal is connected to another switching network, at least the relay disabled status This is achieved by stopping the incoming call request from the storage and switching device to the corresponding receiving side terminal during the period of time, or while being connected to another switching network.

Example of Invention

 The present invention will be described below with reference to FIGS. 1 and 2.

First, the present invention will be described below with reference to FIG. 1 in the case where an exchange is interposed between the storage exchange apparatus and the receiving side terminal.

That is, the system configuration shown in FIG. 1 is almost the same as that shown in FIG. 3 described above, except that there are slight differences in the fault notification signal lines 81 to 8j corresponding to the transmission lines 71 to 7j, respectively. In addition, the failure detection device of the storage and switching device 1 is provided with the relay availability status in the corresponding parts of the transmission lines 71 to 7j via the failure notification signal lines 81 to 8j.
It is detected in 91 to 9j.

Now, in such a system configuration, assuming that a message is transmitted from the terminal 31 to the terminal 41, the message from the transmitting terminal 31 is stored in the storage file device in the storage exchange apparatus 1 as in the case so far. The data is once stored in 11, and then transmitted to the receiving side terminal 41 through the exchange 2. However, if the relay disabled state is detected by all of the failure detection devices 91 to 9j, including the first transmission, and the transmission on the retry performed thereafter as necessary, the storage exchange is performed. The message transmission from the device 1 is to be stopped at least until any one of the fault detection devices 91 to 9j detects the relayable state. In other words, while the exchange 2 is entirely in the relay-disabled state, meaningless message transmission from the storage and exchange device 1 is stopped, and as a result, non-delivery processing based on meaningless message transmission is not generated. It is a thing. In other words, the message exchange is attempted from the storage and exchange device 1 only when the exchange 2 is capable of relaying, and even if the retries are performed a prescribed number of times, the receiving side terminal 41 is still present. When the situation is in the unreceivable state, the storage / exchange apparatus 1 first performs non-delivery processing, and in this non-delivery processing, the message to the receiving side terminal 41 is first erased from the storage file apparatus 11 and the message The non-delivery message is returned from the storage exchange apparatus 1 to the transmission side terminal 31 as the transmission source.

In the above example, the failure enabling / disabling state at the transmission path 71-7j corresponding part can be detected by the storage / exchange apparatus 1 by the fault notification signal lines 81-8j provided corresponding to the transmission paths 71-7j. However, the relay availability status of the exchange 2 as a whole is notified to the storage and exchange device 1 via a single fault notification signal line, or the relay is performed on the transmission lines 71 to 7j at the corresponding portions of the transmission lines 71 to 7j. It is also possible to transmit the availability status.

Next, the present invention will be described with reference to FIG. 2 in the case where a changeover switch is interposed between the storage and exchange device and the receiving side terminal.

That is, in the system configuration shown in FIG. 2, the changeover switch 21 is interposed between the storage and exchange device 1 and the terminal 41, and the terminal 41 is connected to the terminal 51 accommodated in the public network 6 through the changeover switch 21. On the other hand, it is also possible to connect to the storage and exchange device 1 via the changeover switch 21. Whether the terminal 41 is selectively connected to the public network 6 or the storage exchange apparatus 1 depends on the switching state of the switch A provided in the changeover switch 21. Since the switch B interlocking with this is provided, the switching connection state of the switch A is set as the switching connection state of the switch B.
The switching detection device 111 in the storage and exchange device 1 can always detect it via 101. That is, when the terminal 41 is accommodated in the public network 6 via the switch A, the message transmission from the storage / exchange apparatus 1 is stopped during that period. In other words, only when the terminal 41 is accommodated in the store and exchange apparatus 1 via the switch A, the message transmission from the store and exchange apparatus 1 is performed by the receiving side terminal.
41 is attempted, and if the receiving terminal 41 itself is still in the unreceivable state even if the retry is performed a prescribed number of times, the storage / exchange device 1 performs the non-delivery process for the first time. In this non-delivery process, the message to the receiving side terminal 41 is deleted from the storage file device 11 for the first time, and the non-delivery message from the storage and exchange device 1 is sent to the transmitting side terminal 31 as the message sender. Has been sent back. In this example also, the switching notification signal line 101
It is possible to transmit the changeover connection state of the changeover switch 21 on the transmission line 71 without providing.

〔The invention's effect〕

As described above, in the case of the present invention, when there is a non-delivery factor in the switching device itself or the switch itself which is interposed between the storage and switching device and the receiving side terminal, the storage and switching device is inconvenient. Reach process, and therefore, the non-delivery message is not returned from the store-and-forward device to the sending terminal,
It is not necessary for the sending side terminal to send and store messages of the same content with a high frequency in the store and exchange device.

[Brief description of drawings]

1 and 2 are diagrams showing the system configuration of a message storage / exchange system according to the present invention, and FIG.
It is a figure for demonstrating the message delivery method which concerns on a prior art. 1 ... Storage and exchange device, 11 ... Storage file device, 2 ...
Switch (non-storage switch), 21 ... Changeover switch, 31
~ 3m, 41 ~ 4n, 51 …… Terminal, 6 …… Public network

Claims (1)

[Claims] 1. When the receiving side terminal is accommodated in a store-and-exchange device via a non-store exchange, or when the receiving side terminal is stored via a changeover switch that allows the receiving side terminal to be accommodated in another switching network. The message from the sending terminal, which has been stored in the switching apparatus and is temporarily stored in the storage switching apparatus, is delivered from the storage switching apparatus to the non-storage switching apparatus or the receiving terminal via the changeover switch. In response to the request from the store-and-exchange device for the specified number of retries to the receiver-side terminal, if the receiver-side terminal is still in the message unreceivable state, the store-and-exchange device stores the message. The message sent to the receiving terminal is deleted for the first time, and a non-delivery message is returned from the store-and-forward device to the sending terminal as the message sender. In the message delivery method as described above, when the storage / exchange apparatus is notified by the non-storage / exchange apparatus that relay to the receiving side terminal is disabled, or the changeover switch causes the receiving side terminal to exchange another When it is notified that the network is connected, the incoming call request from the storage and switching device to the corresponding receiving terminal is stopped at least while the relay is disabled or while the other switching network is connected. Delivery method from the store-and-forward device.