JPH03283858A - Subscriber line exchange - Google Patents

Abstract

PURPOSE:To eliminate troublesome re-calling when encountering with the busy incoming side terminal, by providing with a storage function to store the registration of store communication service connected by bypassing via a store and forward processor connected to an area relay exchange, and a bypass connection function connected by bypassing via the store and forward processor. CONSTITUTION:When information that a facsimile terminal 7a is at a busy state is received from a subscriber exchange 7b, a subscriber line exchange 1b performs connection to the area relay exchange 8a via an output trunk 5a and an input trunk 8b when a store communication service contract is registered. When the preparation of the store and forward processor 9a is completed, a picture signal is transferred from a facsimile terminal 1a to the store and forward processor 9a via the area relay exchange 8a. The store and forward processor 9a tries to perform the connection to the facsimile terminal 7a at a constant time interval, and transfers the stores picture signal received from the facsimile terminal 1a to the facsimile terminal 7a when the connection is attained. In such a way, the troublesome re-calling can be eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a subscriber line exchange, and particularly to a subscriber line switch having a storage and communication service function that makes a detour connection via a storage and conversion processing device connected to a toll exchange. Regarding line exchanges.

[Conventional technology]

In conventional subscriber line exchanges, when a terminal that accommodates a call encounters a called terminal being busy when making a call, and receives a disconnection signal sent from the called subscriber line exchange, it emits a busy tone to the calling terminal. All they had to do was send it out. This state will be explained using the state transition diagram shown in FIG. 3 during a call on the called terminal of a conventional subscriber line exchange.

Assume now that the calling terminal is a facsimile terminal. The numbers attached to each status display in the figure indicate the status number.

The status display of status number 11 indicates that the subscriber line exchange 1 on the originating side
This indicates that the facsimile terminal 11a housed in 1b has transitioned from an idle state to a calling state. Status number 12
The status display indicates that the dial number information transmitted from the facsimile terminal 11a is being received by the number reception trunk 12a. When the reception of the dialed digit information is completed, digit analysis 12c is performed based on the received dialed digit information, and the outgoing trunk 13a is connected to the subscriber line exchange on the receiving side that accommodates the facsimile terminal on the called side.
and sends out an address signal (hereinafter referred to as IAM) 12b. Next, the status display of status number 13 is IAM12
b to indicate that the called party's facsimile terminal is being called.

In this state, when a disconnection signal (hereinafter referred to as REL) 13b containing information that the called side facsimile terminal is busy is received from the called side subscriber line exchange, the status number 1
As shown in the status display of 4, the sound source (hereinafter referred to as BT)
14a was connected to the facsimile terminal 11a, the facsimile terminal 14a was transferred to a busy tone sending state, and the facsimile terminal on the receiving side was notified that the facsimile terminal was busy.

[Problem to be solved by the invention]

The above-mentioned conventional subscriber line exchange sends out a busy tone to notify when the facsimile terminal on the receiving side is busy. For this reason, the facsimile terminal on the calling side must wait a while and then call again in order to communicate with the facsimile terminal on the called side, which is a problem in terms of handling.

The object of the present invention is to provide a storage function for storing the registration of a storage and communication service to be bypassed via a storage and conversion processing device connected to a toll exchange, which is registered in advance by a terminal to be accommodated, and To provide a subscriber line exchange capable of eliminating the trouble of re-calling when a terminal encounters a called terminal is busy when making a call, by having a bypass connection function for making a bypass connection.

[Means to solve the problem]

The subscriber line exchange of the present invention is a subscriber line exchange belonging to a switching network including a toll exchange connected to a storage and conversion processing device, in which the subscriber line exchange is configured such that when a terminal it accommodates makes a call, the called terminal is busy. This configuration has a storage function for storing the registration of a storage communication service to be connected via the storage/conversion processing device in a detour if the storage/conversion processing device is encountered, and a detour connection function to make a detour connection via the storage/conversion processing device.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. //F5 The facsimile terminal 1a is housed in the subscriber line exchange 11b, and the facsimile terminal 7a is housed in the subscriber line exchange 7b. The subscriber line exchanges 1b and 7b and the toll exchange 8a have mutual outgoing trunks 3a and 5, respectively.
a and incoming trunks 7c and 8b. The toll exchange 8a is connected to a storage and conversion processing device f9a. IAM2 is installed between subscriber line exchanges ib and 7b.
b and REL3b are exchanged, and IAM3c and a response signal (hereinafter referred to as ANM) 5b are exchanged between the subscriber line exchange 1b and the toll exchange 8a.

Next, the operation will be explained.

FIG. 2 is a state transition diagram of one embodiment of the present invention.

The status display for status number 1 indicates that the subscriber line switch 1 on the calling side
This shows that the facsimile terminal 1a housed in b has transitioned from the empty state 1 to the ready state in which one call has been made.

The status display of status number 2 indicates that the dial digit information sent from the facsimile terminal 1a is being received by the digit receiving trunk 2a. When the reception of the dialed digit information is completed, digit analysis 2C is performed based on the received dialed digit information, and the outgoing trunk 3a is connected to the subscriber line exchange 7b on the receiving side that accommodates the facsimile terminal 7a on the called side. Capture and send IAM2b. Next, the status display of status number 3 indicates that the facsimile terminal 7a has been transitioned to the call origination status after sending from the IAM 2b. In this state, the facsimile terminal 7a is sent from the subscriber line exchange 117b to the facsimile terminal 7a.
When the subscriber line exchange 1b receives REL-3b containing information indicating that it is in a busy state, the subscriber line exchange 1b performs a registration determination 3d to determine whether or not a storage communication service contract is registered, and if it is not registered, the facsimile A busy tone is sent to the terminal 1a. If a storage communication service contract is registered, it connects to the toll exchange 8a via the outgoing trunk 5a and the incoming trunk 8b, sends out the IAM3C edited for the storage communication service, and receives status number 5. Transition to. When the preparation of the storage conversion processing device 9a is completed, the toll relay exchange 8a
ANM5b is returned from subscriber line exchange 1b.
transitions to state number 6. In this state, the image signal is transferred from the facsimile terminal 1a to the storage/conversion processing device 9a via the toll exchange 8a. When the storage/conversion processing device 9a completes storage of image signals, it repeatedly tries to connect to the facsimile terminal 7a via the toll exchange 18a and the subscriber line exchange 7b at regular time intervals. If the connection is established, the stored image signal received from the facsimile terminal 1a is transferred to the facsimile terminal 7a, and the delivery is completed.

〔Effect of the invention〕

As explained above, the present invention provides a storage function for storing the registration of a storage and communication service to be bypassed via a storage and conversion processing device connected to a toll exchange, which is registered in advance by a terminal to be accommodated, and a storage and conversion process. By having a detour connection function that makes a detour connection via the device, it is possible to eliminate the trouble of re-calling when the terminal encounters the called terminal is busy when making a call.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a state transition diagram of an embodiment of the present invention, and FIG. 3 is a state transition diagram of a conventional subscriber line exchange during a call on the called terminal. be. la, 7a...Facsimile terminal, lb, 7b
. . . Subscriber line exchange, 2a --- Numerical reception trunk, 2 b , 3 c = --- Address signal (IAM), 2c --- Numerical analysis, 3a, 5
a. Old... Outgoing trunk, 3b... --- Disconnection signal (R
EL), 3d...Registration judgment, 5b...Response signal (ANM) 7c, 8b...Incoming trunk, 8a...Toll switchboard, 9a...・・・・・・
Storage conversion processing device.

Claims (1)

[Claims] In a subscriber line exchange belonging to a switching network including a toll exchange that is connected to a storage and conversion processing device, the subscriber line exchange is configured to process the storage and conversion processing device when the terminal it accommodates encounters a called terminal being busy when making a call. A subscriber line exchange characterized by having a storage function for storing registrations of storage and communication services to be connected in a detour manner through the storage and conversion processing device, and a detour connection function to be connected in a detour manner through the storage conversion processing device.